Session List

Only one abstract is permitted per presenting author with exceptions made for second submissions to an assigned education or tribute session.

Jump to: Amplifying Voices | Education & Policy | Tributes | Contributed Sessions

Special Sessions

SS01 The Next Frontier in Aquatic Sciences: Linking remote sensing, data science, modeling, and open science to understand ecosystems’ emergent properties

Michael Meyer, U.S. Geological Survey ([email protected])
Elisa Calamita, Eawag ([email protected])
Kate Fickas, Esri ([email protected])
Robert Ladwig, University of Wisconsin - Madison ([email protected])
Rachel Pilla, Oak Ridge National Laboratory ([email protected])

In times of an increasingly uncertain climate and growing demand for water resources, there is a need for assessing how aquatic systems worldwide are responding to co-occurring human and climatic disturbances. Over the past half century, remote sensing technology, high performance and cloud computing infrastructure, machine learning techniques, open data practices, and widened training in computer programming have created extraordinary opportunities to expand aquatic science research across spatial and temporal scales. Remote sensing of chlorophyll concentrations has enabled near-global monitoring of algal blooms. Data science and machine learning methods have empowered the prediction of water quality dynamics, while also informing management actions. Process-based models have improved our understanding of environmental fluid dynamics, which can be consequential for ecosystem regime shifts. Open data practices have increased the amount of publicly available data that many calibration and validation techniques ultimately demand. The nexus of data science, remote sensing, modeling, and open science in the aquatic sciences is a dynamic, rapidly progressing space, where novel aquatic science questions can be answered at unprecedented scales.

Given these developments, there can be a lingering question of "What’s next?” To date, many aquatic remote sensing, modeling, and data science efforts have focused on measuring or predicting individual parameters or variables. While these individual efforts are herculean initiatives, a ripe frontier for this nexus is linking limnological, hydrological, oceanographic, and ecological processes and principles with remote sensing, data science, and modeling techniques to understand fundamental emergent properties of aquatic systems and inform monitoring at local-to-global and subdaily-to-decadal scales. Additionally, the increase of open science and data democratization brings the potential for a more diverse, inclusive, and accessible scientific community and more holistic research.

To build a conversation around multifaceted developments in remote sensing, data science, modeling, and the aquatic sciences, this session invites contributors to share how they use one or a combination of remote sensing, data science, modeling, or open science practices to expand the fields of limnology, oceanography, hydrology, or ecology. We envision this session will host a range of presentation topics, including but not limited to novel methods for atmospheric corrections, scaling of cloud and other high-volume computing environments, assessing water quantity and quality across spatial and temporal scales, quantifying long-term changes in stratification dynamics, merging process-based modeling and deep learning, and applying data-intensive techniques for basic and applied research questions.

While submissions may stem from methodological and technical hurdles encountered in remote sensing and data science fields, we challenge submissions to focus on how their efforts de-silo the aquatic sciences from the remote sensing and data science arenas.

We enthusiastically encourage submissions by early career researchers as well as by researchers from BIPOC, LGBTQIA+, and other marginalized identities. An intentional focus on research that breaks down barriers to entry for underrepresented scientists in the fields of remote sensing and aquatic data science, through open science, will yield insight into the power and potential of the next frontier in emergent properties of aquatic systems.

Keywords: Remote Sensing, Data Science, Machine Learning, Synthesis, Emergent Properties

SS02 Towards Resolving Uncertainties in Methane Production, Consumption, and Emissions in Aquatic Environments

Mina Bizic, Leibniz Institute of Freshwater Ecology and Inland Fisheries ([email protected])
Sofia Baliña, Radboud University ([email protected])
Paul del Giorgio, UniversitĂ© du QuĂ©bec Ă  MontrĂ©al ([email protected])
Tonya DelSontro, University of Waterloo ([email protected])
Yves Prairie, UniversitĂ© du QuĂ©bec Ă  MontrĂ©al ([email protected])

Methane emission from aquatic environments have been reported to be highly variable but significant enough to be largely responsible for the uncertainty in estimates of methane emissions from natural sources. Surface emissions correspond to the net balance between production and consumption processes and include several biotic and abiotic mechanisms such as diffusion and lateral transport of sediment CH4, demethylation of organic compounds in oxic environments, photosynthesis, ebullition, and transport by plants and organisms. Nevertheless, the contribution of individual mechanisms to accumulations and emission of methane is not well constrained. Additionally, there are large discrepancies between top-down and bottom-up approaches to evaluate the role of lakes in closing the global methane budget.

In deeper water, at the oxic-anoxic interfaces, be it in the water column, close to the sediment or within the sediment column, aerobic methane oxidizers consume significant amounts of the methane produced in anoxic environments. In the oxic surface layers of oceans and lakes, this process is less understood. For example, contradicting data exists regarding the inhibitory effect of light and oxygen on the methane oxidation process. As methane emissions are a result of production, transport, and consumption, it is essential to gain a better understanding of the organisms playing a role in the process as well as the different rates of production and consumption.

In this session we welcome contributions addressing methane production, consumption, transport, and emissions from different aquatic bodies. Studies may relate to microbial communities involved in CH4 cycling, quantification of classical and novel processes and pathways, large-scale spatio/temporal studies, isotopic characterization of novel methane sources, as well as novel methodological approaches to quantify methane emissions from water. Of particular interest are methane studies in oxic environments.

Keywords: Methane emission, Oxic Methane Production, Methanotrophy, Methane isotopes

SS03 Uncovering links between aquatic geochemistry and microbial communities, from genomes to nutrient cycles

Julian Damashek, Hamilton College ([email protected])
Benjamin Kramer, University of Minnesota Duluth ([email protected])
Cody Sheik, University of Minnesota Duluth ([email protected])
Annika Mosier, University of Colorado Denver ([email protected])

Microbial metabolisms drive many important biogeochemical processes in all aquatic ecosystems. In turn, microbial activity depends on the availability of nutrients like carbon, nitrogen, or phosphorus, which can also profoundly affect microbial community assembly. Recent technological advances in microbial and biogeochemical techniques have provided novel insights into the coupling between microbial activity and geochemistry, but it remains challenging to predict the effects of present and future environmental changes. Sequencing approaches such as metagenomics have opened the "black box” of environmental microbiology, using the presence of key genes to predict the metabolism of novel microbes. However, a disconnect still exists between connecting in situ geochemical measurements, such as nutrient cycling rates and fluxes, with the genetic potential of resident microbial communities.

This session highlights advances in linking aquatic geochemistry and microbiology. Any work related to microbial processes and biogeochemistry is welcome; methods from both fields need not be included in each presentation, as long as data has relevance to both microbes and biogeochemistry. For instance, studies of biogeochemical rate measurements or models are welcome, provided they are focused on microbially-driven processes, and as are studies solely on microbial ecology but focused on microbes with biogeochemical relevance. Studies may include field sampling, method development, computational analysis, and/or modeling. Biogeochemical focus may include any cycles and processes, including "traditional” cycles as well as other aquatic contaminants such as antimicrobial resistance genes, pharmaceuticals, PFAS, and others. We welcome submissions studying any aquatic ecosystem, whether freshwater, brackish, or marine, and including benthic and/or water column data. Studies including microbial data may use broad community-level data or targeted experiments with specific populations or species. We take a broad definition of "microbe” and welcome studies of archaea, bacteria, eukaryotic microbes, and viruses. In individual presentations or in the session as a whole, we strive to bring together interdisciplinary work using a variety of approaches to explore the intersection of aquatic microbial ecology and biogeochemistry and integrate knowledge from disparate fields and a wide range of ecosystems.

Keywords: Microbial Ecology, Biogeochemistry, Metagenomics, Genomics, Nutrient Cycling

SS04 Microbial patterns and processes along aquatic continua in the face of anthropogenic disturbances

Alain Isabwe, Cooperative Institute for Great Lakes Research (CIGRL), School for Environment and Sustainability, University of Michigan, Ann Arbor ([email protected])
Sophie Crevecoeur, Watershed Hydrology and Ecology Research Division, Environment and Climate Change Canada ([email protected])

Rivers and lakes are integral components of hydrological networks that regulate the flow of water, energy, and materials across the landscape. While these ecosystems provide crucial services to living organisms, they are increasingly threatened by human activities, such as changes in land use, hydrological modifications, pollution, agricultural runoff, and urban wastewater discharge. The response of freshwater microbial biodiversity to these anthropogenic pressures along aquatic continua is the central theme of discussion in this session. We invite presenters whose research links microbial communities with longitudinal changes along aquatic continua. Presentations will encompass a diverse range of systems and approaches. For instance, the metagenomic characterization of freshwater micro-organisms along a land use gradient could provide insights into how urbanization in watersheds alters microbial biodiversity in streams. Comparisons of microbiomes along river-lake continua across seasons will shed light on the biogeochemical consequences of flow alteration. Mechanisms driving plankton succession will be discussed to evaluate whether spatial overwhelms "the widely known” seasonal succession of plankton in river-lake continua. Presenters will also contextualize their findings broadly and identify critical gaps in knowledge and future research directions. The collective expertise of participants spanning freshwater macro- and microbial ecology, biogeochemistry, hydrology, modeling, and molecular approaches will facilitate valuable interdisciplinary exchanges.

Keywords: Aquatic microbiome, River-lake continuum, Human disturbance, Hydrological changes, Spatial vs seasonal

SS05 The power of time series for unraveling aquatic microbial community interactions and functions

Katherine Mcmahon, University of Wisconsin-Madison ([email protected])
Ryan Newton, University of Wisconsin Milwaukee ([email protected])

Time series sampling of aquatic ecosystems is a powerful approach to detecting and perceiving ecosystem change, and the drivers contributing to that change. The concept of the "Invisible Present" states that some changes cannot be observed without extended and sufficiently dense sampling. Microbial communities are sensitive response variables and therefore sentinels of change. Freshwater and marine microbial time series are being used to unravel microbial community dynamics and understand the implications of change with respect to community function. They can also be used to infer terrestrial contributions to aquatic communities, including contaminant organisms delivered in storm water inputs. Attendees will leave the session able to explain why time series are important for understanding microbial ecology and evolution, and what we can (and can't) learn from them. They will also be able to identify major roadblocks preventing advances on this topic, along with proposed near-term next steps.

Keywords: bacteria, time series, dynamics, phytoplankton,

SS06 The role of macrophytes in aquatic biogeochemical cycles

Charlotte Grasset, Uppsala University ([email protected])
Sheel Bansal, United States Geological Survey ([email protected])
Pascal Bodmer, Cornell University ([email protected])
Meredith Holgerson, Cornell University ([email protected])
Cristina Ribaudo, UMR 5805 EPOC ([email protected])

Macrophytes alter the physical, chemical, and biological environments of shallow areas in aquatic ecosystems (e.g., wetlands, ponds, lakes and rivers), and therefore play a significant role in biogeochemical processes (e.g., greenhouse gas-GHG production, organic carbon-OC burial, denitrification coupled to nitrification, net primary production-NPP, organic matter decomposition). For instance, macrophytes can increase emissions of the GHG methane to the atmosphere, but at the same time, they fix carbon dioxide through photosynthesis for NPP, which can increase OC burial in sediments. Global changes (i.e. climate warming, diffuse pollution, biological invasions and anthropization) will undoubtedly impact macrophyte productivity and community composition, which in turn will affect key biogeochemical processes relevant to global change.

The effect of vegetation on aquatic biogeochemical processes are complex and dependent on a suite of interacting factors, including environmental conditions (e.g., hydrology, climate, salinity), plant traits and population / community dynamics. As such, more local-scale studies are needed to better understand the influence of macrophytes on aquatic ecosystem GHG and nutrient dynamics. The lack of local studies also limits our ability to scale GHG fluxes and OC burial from vegetated zones of aquatic ecosystems in regional and global upscaling efforts.

In this session, we welcome contributions from studies that explore how macrophytes influence biogeochemical cycles, including but not limited to, GHG production and fluxes, OC burial, NPP and the nitrogen cycle. We also welcome studies that scale aquatic vegetation (e.g., biomass, NPP), or their influence on GHG fluxes and nutrient cycling, to the landscape using remotely sensed information and empirical or process-based modeling techniques. Studies that demonstrate the implications of land management on macrophytes and associated GHG fluxes and nutrient dynamics are also encouraged.

Keywords: Aquatic plants, biogeochemistry, greenhouse gases, nitrogen cycle, organic carbon burial

SS07 Salinization of freshwater habitats

Shelley Arnott, Queen's University ([email protected])
Steven Brady, Southern Connecticut University ([email protected])
Lizzie Emch, University of Wisconsin-Madison ([email protected])

Human activities such as the application of road deicing salts, resource extraction, agriculture, and climate change are increasing the concentration of salts in freshwater systems around the world. The salinization of freshwater affects physics, biogeochemical cycling, and organismal population and community dynamics of streams, lakes and wetlands. This session will showcase new research on ecological and evolutionary impacts of freshwater salinization and how salinization will impact the ecosystem services freshwaters provide. We also welcome presentations on naturally saline systems. Our goal is to promote collaboration and facilitate knowledge exchange among researchers working on different aspects of freshwater salinization through this multidisciplinary session.

Keywords: deicers, impacts, mitigation, saline ecosystems,

SS08 Advances in estimating greenhouse gas emissions from managed aquatic ecosystems

Jake Beaulieu, United States Environmental Protection Agency ([email protected])
Bridget Deemer, U.S. Geological Survey ([email protected])
Natalie Griffiths, Oak Ridge National Laboratory ([email protected])
Rachel Pilla, Oak Ridge National Laboratory ([email protected])

Aquatic ecosystems are a large but uncertain source of greenhouse gases (GHG) to the atmosphere. Managed aquatic ecosystems may be a disproportionately large source of emissions given their co-location with human activities and the influence of artificial water level management. The Intergovernmental Panel on Climate Change (IPCC) recently published a methodology for estimating anthropogenic GHG emissions from managed aquatic ecosystems (e.g., reservoirs, canals, ditches, farm ponds) and several countries now include this source in their national GHG inventory. National GHG inventories are used to track trends in GHG emissions, monitor compliance with emission-reduction commitments under international treaties, provide an important framework for incorporating aquatic systems into climate-relevant policy discussions, and highlight the need for accurate emission estimates. In this session, we solicit presentations that address challenges and recent advances in estimating GHG emissions from managed aquatic ecosystems. We encourage contributions focusing on 1) spatial and temporal patterns in emission rates, 2) biophysical drivers of GHG production and emission, 3) models (statistical or mechanistic) for predicting aquatic GHG emissions, 4) methods for upscaling and/or downscaling emission measurements to regional and/or national scales, and 5) identification and mapping of managed aquatic ecosystems. We welcome submissions by students, early career researchers, and researchers from BIPOC, LGBTQIA+, and other marginalized identities.

Keywords: greenhouse gas, flooded lands, methane emissions, upscaling, anthropogenic influence

SS09 Abrupt change in aquatic ecosystems

Emily Stanley, University of Wisconsin - Madison ([email protected])
Mike Pace, University of Virginia ([email protected])
Jake Vander Zanden, University of Wisconsin ([email protected])

Ecological hallmarks of our entry into the Anthropocene include shifts in current drivers, emergence of new drivers of ecosystem structure and function, and accelerating change in many ecological patterns and processes. These include abrupt changes- that is, changes that are fast in time or fast relative to their drivers. These rapid and often unexpected dynamics have been described among lakes and rivers as well as coastal and pelagic marine environments, and across levels of organization from populations to ecosystems. From a human perspective, abrupt changes in aquatic ecosystems are rarely viewed as positive. And because of their speed, adapting to or managing these changes is difficult and may thus compromise ecosystem goods and services, and, more broadly, human well-being. This session invites contributions that report on abrupt changes in aquatic ecosystems at the population, community, or ecosystem scale; about responses to an abrupt change in a key driver; or that explore the causes and consequences of these rapid changes. Contributions are also welcome on research to manage aquatic ecosystems and adjacent human communities in the face of potential for abrupt change.

Keywords: regime shifts, thresholds, disturbance, tipping points

SS10 Building freshwater knowledge and networks

Nicole Hayes, University of Wisconsin Stout ([email protected])
Marissa Jablonski, Freshwater Collaborative Wisconsin ([email protected])
Jill Coleman Wasik, University of Wisconsin River Falls ([email protected])

Increasing human demands and a changing climate are altering water quality and quantity in ways that challenge ecosystem resilience, human health, and existing water policy and infrastructure. Lack of funding and coordination between diverse stakeholders hamper efforts to maintain diverse aquatic ecosystems and access to high quality water resources. Even regions with abundant water, such as the Great Lakes area of the United States, struggle to meet the needs of all water users without degrading water quality. The Freshwater Collaborative of Wisconsin is a multidisciplinary network of researchers across 13 University of Wisconsin institutions seeking to collaborate across academic disciplines to generate insights into the stressors affecting regional water issues and recruit and develop training programs to train the next generation of water scientists. The Freshwater Collaborative of Wisconsin has identified ten grand challenges for maintaining water quantity and quality, including emerging and agricultural contaminants harming water quality, policy and technological limitations to addressing restoration efforts, and competing interests for dwindling natural ecosystems. By funding research projects, developing water related cross-campus curricula, and facilitating relationships with community partners, the Freshwater Collaborative of Wisconsin seeks to resolve these challenges. In this session, we invite contributions related to the Freshwater Collaborative of Wisconsin. This includes primary research presentations funded by the Freshwater Collaborative of Wisconsin or talks that address the development of statewide curricula, internship programs, and industry partnerships aimed at training the next generation of water experts. We also encourage talks that highlight the opportunities to leverage what has been learned and developed through the Freshwater Collaborative of Wisconsin to develop regional, national, and international networks aimed at solving water issues.

Keywords: collaborative research networks, undergraduate research, curricula, limnology, research networks

SS11 Facing the Gauntlet: Understanding the How, When and Where of HAB Prevention, Control, and Mitigation (PCM)

Felix Martinez, NOAA ([email protected])
Jason Huntley, University of Toledo ([email protected])
Mandy Michalsen, USACE ([email protected])
Allen Place, University of Maryland Center for Environmental Science ([email protected])
Kaytee Pokrzywinski, NOAA ([email protected])

Although our understanding of HABs is still far from complete, the severity of their impacts precludes waiting for that knowledge before pursuing methods and technologies to, at least in part, prevent, control, and/or mitigate HABs and their impacts. PCM approaches can be based on tools that either physically remove algae, biophysically precipitate the algae out of the water column, chemically kill the algae, inhibit toxin(s) synthesis, prevent toxin(s) release, or remove/degrade toxin(s) from affected waters. The private sector, academia and the federal government have been working on developing and vetting strategies using algaecides, nanobubbles, ozonation, UV-light, flocculants, adsorption, bioremediation, etc. However, questions remain about how effective these methods can be at scale depending on the type of algae and the intensity with which many of the worst HABs occur. While there are now many products in the development stage there are paucity of solutions available on the market. Therefore, in this session, we will showcase research that demonstrates technical advances in the development of PCM methodologies and assessments of their effectiveness, with particular emphasis on the feasibility/scalability of these technologies for real-world applications and transitioning these to practitioners.

Keywords: harmful algal blooms, prevention, control, mitigation, algae

SS12 Influence of changing winters on inland waters from organisms to ecosystems

Isabella Oleksy, University of Colorado Boulder ([email protected])
Ana Morales, University of Vermont ([email protected])
Trista Vick-Majors, Michigan Tech University ([email protected])

Over the past several decades, aquatic systems have experienced significant alterations in ice phenology and winter weather, and more dramatic changes are expected in the future. Understanding the rapidly increasing magnitude of change and its consequences requires investment in research across diverse bodies of water and the diverse winter conditions they experience, as well as the physical, biological, and chemical aspects of the systems. This session invites presentations focused on any of these aspects, with the goal being to bring together diverse approaches and knowledge bases to advance understanding of the influence of changing winters on inland waters. In this session, we encourage field scale, laboratory, modeling, and predictive studies that investigate both basic and applied questions relating to changing winter conditions. We encourage submissions by early career researchers as well as by researchers from BIPOC, LGBTQIA+, and other historically excluded identities.

Keywords: ice, climate change, ecology, biogeochemistry, crysophere

SS13 Navigating stormy waters: understanding the response of aquatic ecosystems to storms in a changing climate

Daniel Szydlowski, Center for Limnology, University of Wisconsin-Madison ([email protected])
David Ortiz, Center for Limnology, University of Wisconsin-Madison ([email protected])

Climate change is shifting long-term mean values of environmental drivers like temperature and precipitation, but it is also changing their variability. Changes in the long-term variability of precipitation and wind can manifest as stronger storm systems which occur more frequently and with greater intensity than they did in the past. Increasingly extreme storm events can affect how we normally view aquatic ecosystem function through forcings associated with precipitation, wind, or a combination of both. For example, strong wind events may mix the water column of lakes, suspending sediments and altering the availability of nutrients and light, while heavy precipitation can bring influxes of nutrients from the watershed or cause flooding. Streamflow may drastically increase in response to extreme precipitation, bringing with it large flows of solutes, particulate matter, and sediment. In coastal ecosystems, storms can disturb aquatic habitat and organisms while also altering the physical and chemical characteristics of the system. Understanding the current response of aquatic ecosystems to storms is crucial if we want to better predict how increasingly extreme storms will affect aquatic ecosystems in the future. We welcome any contributions focused generally on the effects of storms on aquatic ecosystems, including their physical, chemical, and biological responses. We are particularly interested in studies which place the effects of storms into a broader context of global climate change.

Keywords: storms, disturbance, climate change, weather

SS14 Exploring nitrogen fixation along the freshwater-marine continuum; A joint ASLO-SFS endeavor

J. Thad Scott, Baylor University ([email protected])
K. Riley Book, University of Wisconsin-Madison ([email protected])
Morgan S. Sobol, University of Wisconsin-Madison ([email protected])
Robinson W. Fulweiler, Boston University ([email protected])

Nitrogen fixation (diazotrophy), the conversion of di-nitrogen (N2) gas to reactive nitrogen (N) by specialized microbes (diazotrophs), plays an essential role in Earth’s N cycle. Molecular ecology continues to show the common presence of diazotrophs across all of Earth’s biomes. Yet, N2 fixation rates and the functional role(s) of N2 fixation in population, community, and ecosystem ecology remain poorly studied, particularly in the aquatic ecosystems that connect terrestrial landscapes and the open ocean. The Aquatic Nitrogen Fixation Research Coordination Network was established in 2021 to open lines of communication among N2 fixation researchers at scales ranging from headwater streams and wetlands to the coastal oceans. This session is dedicated to all N2 fixation science. We invite abstracts across all scales of study from molecular ecology to global biogeochemistry and using any approaches from surveys to field/lab experiments to mathematical modeling. We are interested in a range of N2 fixation related research. This includes, but not limited to, studies reporting N2 fixation rates, the abundance or activity of diazotrophs, and/or the biodiversity of diazotrophs across the freshwater-marine continuum. We also welcome contributions on the molecular mechanisms of N2 fixation, the stoichiometry of diazotrophs from the physiological to the ecosystem scale, and the interacting biotic and abiotic constraints of diazotrophs in aquatic ecosystems. The session will provide a rare opportunity to share science not only with the ASLO community, but also with the Society for Freshwater Science (SFS) who are hosting a contemporaneous meeting in Philadelphia, PA. Our session will occur simultaneously with an identical SFS session. Some talks will be live streamed in both directions, and we will host questions for speakers in both directions.

Keywords: nitrogen fixation, diazotroph, cyanobacteria, bacteria, archaea

SS16 Understanding aquatic ecosystem health in a changing world

Daniel Roelke, Texas A&M University Galveston ([email protected])
Jessica Labonte, Texas A&M University Galveston, USA ([email protected])
Simon Mitrovic, University of Technology Sydney, Australia ([email protected])
Robert Ptacnik, University of South-Eastern Norway, Norway ([email protected])
Sierra Cagle, Texas A&M University Galveston ([email protected])

With global warming and increased erratic and severe weather events, our world is changing. Understanding aquatic ecosystem health, e.g., the mechanisms that sustain biodiversity and ecosystem functions, in a world with which we are familiar is difficult, let alone in a constantly changing world. Generations of aquatic ecologists have produced knowledge showing linkages between inflows (hydraulic displacement and resource loading), temperature, stratification, irradiance, conductivity, biodiversity, and ecosystem functions. With this understanding, our power to predict ecosystem health remains limited and our ability to manage aquatic ecosystems tenuous. In an unfamiliar and changing world, other processes that are currently not considered in management decisions are likely to become more important. For example, increased propagule pressure on the early-season plankton community from the previous year’s late-season plankton community will likely occur with milder winters. It is possible that less palatable assemblages will occur earlier in the season, which might sequester resources and prevent them from moving up the food web at a time when many organisms are spawning. In addition, microbially-driven ecosystem processes and interactions between microbes and other plankton taxa are likely to change. Erratic weather might lead to greater stochasticity and magnitude in disturbances causing local extinctions of rare species, thereby decreasing richness and destabilizing ecosystem functions. In this session, we welcome presentations that explore the issue of how to better understand aquatic ecosystem health (including, but not limited to, microbes and plankton) in a changing world with which we are unfamiliar. Presentations that are based on patterns observed across environmental gradients (e.g., latitudinal, precipitation, temperature, disturbance frequency, etc.) are particularly welcome.

Keywords: ecosystem health, climate change, managing HABs, environmental gradients, ecological gradients

SS17 Data-intensive research builds understanding of aquatic ecosystem responses to change at regional to global scales

Xinyu Sun, Michigan State University ([email protected])
Patrick Hanly, Michigan State University ([email protected])
Kendra Cheruvelil, Michigan State University ([email protected]
Patricia Soranno, Michigan State University ([email protected])

Human-induced global stressors, including climate change, land use intensification, and the spread of invasive species, among others, have significant direct and indirect consequences for aquatic biological communities, physical and chemical processes, ecosystem and human health, and associated ecosystem services. Empirical, broad-scale (spatial and/or temporal) studies on multiple aquatic systems (tens to thousands) are key to improving our understanding of these complex issues across heterogeneous macroecological contexts and for the prediction and management of aquatic ecosystems’ responses to local and global changes. This session invites presentations about the ecological contexts of aquatic ecosystems and/or their responses to human-caused or mediated drivers at broad scales (regional to global) using insights from data-intensive approaches that include, but are not limited to, field surveys, remote sensing, machine learning, artificial intelligence, and statistical and process-based modeling.

Keywords: landscape limnology, macrosystem ecology, disturbance, climate change, global change

SS18 The Wisconsin Idea and Lakes: Putting Water Research Into Practice for Wide Public Benefit

Eric Olson, Extension Lakes ([email protected])
Catherine Hein, Wisconsin Department of Natural Resources ([email protected])
Jake Vander Zanden, University of Wisconsin - Madison ([email protected])

Surface water management projects, both research and practice, are crucial for the future of rivers, lakes, wetlands, and groundwater, and a core interest of ASLO members. This poster session will provide a setting for presentation and discussion of ongoing applied research projects and recent findings. Resource managers from national, state, and local governments will share examples of how academic and research work is translated into changed and improved practices to enhance and protect water resources. This approach reflects the Wisconsin Idea, the notion that the fruits of university-based research must be widely shared and applied to affect people’s lives beyond the campus.

Keywords: management, restoration, water quality, habitat, fisheries

SS20 Revisiting the Freshwater Imperative: convergence of freshwater sciences with management, policy, and stewardship

Scott Higgins, IISD Experimental Lakes Area ([email protected])
Steven Sadro, UC Davis ([email protected])
Carolina Barbosa, Colorado State University ([email protected])
Stephanie Hampton, Carnegie Institution for Science ([email protected])

Freshwater is a critical resource that remains threatened by a wide range of human activities and environmental changes. One of the greatest challenges we face in addressing emerging issues in aquatic science is integrating transdisciplinary perspectives and approaches. Relevant disciplines from ecology, geophysics and engineering to policy, management and stewardship have historically brought formidable knowledge and tools to addressing environmental issues. However, while freshwater issues are often large and transdisciplinary by nature, the relevant disciplines have grown on independent trajectories that are reflected across academic, government and non-government institutions and are often disconnected with relevant stakeholder groups. For these reasons and others, gaps between the identification of a problem and the implementation of a policy or management solution often span decades or longer. In this session our intention is to explore best practices, case studies and perspectives from researchers, resource managers and those influencing policies or regulations to examine how we systematically bridge divides across relevant disciplines and shorten the gap between science and stewardship. Our goal is to discuss ongoing efforts and reflect on what scientists have accomplished, what we have missed, and what lessons we have learned that can be applied to future environmental threats. We encourage presentations on case studies, perspectives, and ongoing efforts to improve the linkages between research and freshwater stewardship, management and policy, at local to international scales.

Keywords: Policy, Freshwater stewardship, Applied aquatic science, Multiple Stressors, Stakeholder engagement

SS21 Water Quality Indicators of Climate Change and Anthropogenic Inputs in Freshwaters

Archana Venkatachari, University South Carolina ([email protected])
Quin Shingai, Dartmouth College ([email protected])
Panditha Gunawardana, Trent University ([email protected])
Annie Bourbonnais, University of South Carolina ([email protected])
Kathryn Cottingham, Dartmouth College ([email protected])

Human activities, including urbanization, agriculture, and industry, coupled with a changing climate, exert significant pressure on freshwater ecosystem functions, driving alterations in external inputs that subsequently affect internal recycling mechanisms. External inputs and internal recycling mechanisms encompass and influence a wide range of water quality parameters, including biological, chemical, and physical contaminants, all of which have the capacity to substantially affect the health and stability of freshwater systems. Increased anthropogenic inputs coupled with pressure on freshwater resources have led to alterations in freshwater ecosystems such as eutrophication and subsequent harmful cyanobacterial blooms. In addition, climate change models predict increased occurrence of extreme events (flooding, extended droughts), which may further magnify the seasonal and multiannual disruption of ecosystem functions. To protect water resources, it is crucial for managers and decision-makers to set realistic targets for sustainable water quality management. Consequently, there is a pressing need for the development of comprehensive indicators capable of encapsulating the intricate interplay between anthropogenic inputs and the escalating impact of climate-related events.

The nature of input patterns in freshwater ecosystems vary based on factors such as temperature and trophic regimes. Responses to these alterations diverge among different freshwater systems, such as streams, impoundments, and natural lakes. Naturally, methods for monitoring and assessing water quality within these systems will also vary. Bioindicators, gray water footprint (GWF), discrete water column sampling and subsequent laboratory techniques such as colorimetry, stable isotopes and other physico-chemical tests have been used qualitatively and quantitatively to understand the nature of external inputs. Recent advancements in Unmanned Aerial Vehicles (UAVs), Autonomous Surface Vehicles (ASVs), and Unmanned Underwater Vehicles (UUVs) present promising prospects for large-scale monitoring of freshwater systems that otherwise lack robust spatial and temporal data.

This session aims to invite talks from academic and nonacademic researchers working with techniques like stable isotopes, satellite data, and autonomous systems to quantify the influence of anthropogenic inputs and climate change using water quality indicators in freshwaters.

Keywords: Climate change, New monitoring technology, Nutrient loading, Water quality indicators, Freshwaters

SS22 Interaction of physical and biological processes in large lakes across time and space

Lars Rudstam, Cornell University ([email protected])
Lyubov Burlakova, SUNY Buffalo State ([email protected])
Alexander Karatayev, SUNY Buffalo State ([email protected])
James Watkins, Cornell University ([email protected])

The largest lakes of the world contain two thirds of the surface freshwater on the planet and are also centers of intense human activities affecting the ecosystem services supplied by these lakes, including water quality, fisheries, and biodiversity. Long-term monitoring is essential to understand the effects of these activities in any system, but sampling such large spatial scales is difficult, often requiring oceanographic methods and large vessels. Although the importance of these lakes and the ecosystem services they provide is widely recognized, the challenges that we are facing in such large systems include:

  • what environmental factors drive species distribution across a range of spatial and temporal scales;
  • how to differentiate long-term change from inherent spatiotemporal variation;
  • how to integrate emerging measuring systems and methods with traditional sampling techniques while still maintaining continuity of historic time series.
  • Incorporating new technologies including autonomous sampling , video imaging and others enabling collections of large data sets at high resolution into monitoring programs.

We invite talks on the issues associated with spatial and temporal processes as well as on the use of long-term data series for understanding ecosystem changes in large lakes of the world.

Keywords: lake, benthos, zooplankton, biodiversity, invasive species

SS23 Dynamics of reservoir ecosystems in the Anthropocene: Ecology, Biogeochemistry, and Physics

Ruchi Bhattacharya, Cleveland State University, Cleveland, Ohio, USA ([email protected])
Lesley Knoll, Miami University, Oxford, Ohio ([email protected])
Nicole Hayes, University of Wisconsin Stout, Menomonie, WI, USA ([email protected])
Michael Vanni, Miami University, Oxford, Ohio ([email protected])

Reservoirs are ubiquitous and growing in number globally. These constructed aquatic structures are differentiated from natural lakes and ponds as many are anthropogenically managed to provide varying ecosystem services, including drinking water supply, flood control, irrigation, hydropower generation, navigation, and recreation. Watershed-reservoir linkages, however, can play an integral role in driving ecological processes, nutrient and sediment cycling, and mixing regimes within the reservoir and in their receiving waters. Reservoirs tend to have large watershed area-to-reservoir area ratios (i.e., tightly coupled terrestrial-aquatic linkages) and are thus greatly influenced by changing climatic conditions, altered hydrological connectivity, and watershed disturbances. We aim to use this session to invite research contributions highlighting how physical, ecological, and biogeochemical processes respond to event/episodic and long-term changes in global stressors across different reservoir types and ecoregions. We aim to use the session to bring together the broader scientific community to improve our understanding of reservoir processes and to identify future research needs and directions. As such, we encourage contributions from scientists studying all aspects of reservoir ecosystems across the globe.

Keywords: Lakes, Nutrients (Carbon, Nitrogen, Phosphorus), Limnology, Longterm data, Lake Models

SS24 Spatial Patterns of Stressor-Ecosystem Relationships in the Laurentian Great Lakes

Christopher Filstrup, University of Minnesota Duluth ([email protected])
Euan Reavie, University of Minnesota Duluth ([email protected])
Kathryn Schreiner, University of Minnesota Duluth ([email protected])

What are the spatial distributions of physical, chemical, and biological parameters in the Great Lakes, and what are the mechanisms driving these patterns? The Laurentian Great Lakes hold approximately 20% of global surface freshwater supplies, and because of their size, differences in morphometry, surrounding landscape characteristics, climate, and circulation patterns contribute to spatial heterogeneity in ecosystem functioning. The lakes are responding to multiple stressors that may be operating at different spatial scales (e.g., localized contaminants discharge vs. basin-wide warming). While previous research has documented spatial heterogeneity of various ecosystem responses or conditions (e.g., phytoplankton patchiness, contaminant hotspots), differences in driver-response relationships across the basin remain poorly understood, especially in the context of emerging stressors and climate change. Further, knowledge of spatial dynamics is complicated by the physics of large lakes (e.g., basin and catchment morphology, circulation patterns, stratification, seiches) and associated connectivity (or lack thereof) across sites compared to smaller inland lakes. We invite talks that use various approaches (e.g., remote sensing, modeling, statistical analysis of basin-wide monitoring data, analysis of field collected samples) within a macrosystems framework to better understand spatial heterogeneity in stressor-ecosystem functioning relationships across the Laurentian Great Lakes. We welcome talks that investigate diverse stressors (e.g., climate, nutrients, contaminants, cyanotoxins) and effects on diverse functions (e.g., water quality, primary productivity, secondary productivity, benthic macroinvertebrate biomass) in an effort to continue synthesizing Great Lakes condition across different studies.

Keywords: climate change, ecosystem functioning, Laurentian Great Lakes, macrosystems ecology, multiple stressors

SS25 Fire and Water: Towards an Understanding of Wildfire Impacts on Aquatic Ecosystems

Sudeep Chandra, University of Nevada- Reno ([email protected])
Facundo Scordo, Instituto Argentino de OceanografĂ­a, Universidad Nacional del Sur (UNS)-CONICET, BahĂ­a Blanca, Buenos Aires, Argentina ([email protected])
Adriane Smits, UC Davis ([email protected])
Jessica Corman, Unviersity of Nebraska, Lincoln ([email protected])
Janice Brahney Brahney, Utah State University ([email protected])
Steve Sadro, UC Davis ([email protected])

Historical landscape management, an increase in ignitions, and climate change have led to an increase in wildfires globally. Wildfires are expected to increase in size, frequency and severity as global temperature increases. Direct effects from wildfires can affect fundamental hydrologic and biogeochemical transformations from land to water (e.g., groundwater, lakes, streams) while smoke plume emissions from fires can alter the ecology of ecosystems far beyond burned watersheds. This session will focus on understanding wildfire impacts on aquatic ecosystems at different scales of time (seasonal to decadal) and space (single ecosystems to continental and global). We will also consider impacts across biological scales, from physiological impacts on organisms to biogeochemical cycling. We seek to unravel how wildfires affect fundamental functional processes within aquatic ecosystems and to understand the resilience of ecosystems to wildfire disturbances. Simply, in this session we will explore what happens when fire and water mix?

Keywords: Water, Smoke, Fire, Burn

SS26 Symbiosis in Aquatic Systems

Carla Caceres, University of Illinois Urbana-Champaign ([email protected])
Jeff Dudycha, University of South Carolina ([email protected])

Aquatic systems provide wonderful laboratories for exploring symbiosis. The nature of these tight associations, both beneficial and antagonistic, ranges from viruses and their bacterial hosts to bacteria interacting with eukaryotic hosts, to eukaryotic symbionts influencing eukaryotic hosts. The application of high-throughput sequencing technologies to symbiosis in both freshwater and marine habitats has allowed for a more mechanistic understanding of potential links between the microbes and important fitness-related traits of the host, and how that variation may influence the interactions of the host with the rest of the food web. Yet our understanding of the factors that drive these associations and how they influence the interactions of the hosts remains limited.

Our proposed special session builds on our proposed Sunday workshop funded by the Gordon and Betty Moore Foundation, by expanding the conversation beyond Daphnia as a host organism. The workshop will leverage the ASLO meeting location that is likely to attract many scientists who focus on freshwater zooplankton. This workshop will catalyze new collaborations by providing a forum in which researchers can learn about each other’s work and relationships to the D. dentifera – symbiont system, and brainstorm how questions could be synergistically approached. This proposed special session will move beyond freshwater zooplankton to stimulate discussion among scientists working on symbioses across a diversity of aquatic habitats, host organisms, and symbionts. We envision that the invited speakers will represent both ASLO members and other scientists who are attending ASLO for the first time. By bringing together a diverse group of speakers, we hope to overcome the silos that are often built around the focal host, the symbiont, or the particular habitat.

Keywords: mutualism, parasitism, disease, symbiont,

SS27 Highlighting the "bio” in biogeochemistry: Trait-based insights into aquatic ecosystem functioning and its response to global change

Brittni Bertolet, University of California Irvine ([email protected])
Celia Symons, University of California Irvine ([email protected])
Carly Olson, University of Nebraska Lincoln ([email protected])

Understanding and predicting ecosystem responses to global change is a major challenge in aquatic ecology. Trait-based approaches have emerged as useful for understanding aquatic ecosystem functions, including primary productivity, methanogenesis, nutrient cycling, and food web dynamics, amongst others. Specifically, functional traits are recognized as a necessary link for scaling the interactions between organisms and the environment from individuals to ecosystems. For example, functional traits of bacteria and phytoplankton, such as size, growth rate, temperature optima, and stoichiometry, are understood to influence community assembly and ecosystem elemental cycling. Similarly, growth rates and feeding rates of zooplankton can help inform trophic transfer of energy and nutrients. This session aims to integrate across disciplines and scales of organization to highlight the "bio” in biogeochemistry and showcase studies which provide mechanistic understanding of global change impacts on aquatic populations, communities, and ecosystems. To this end, we welcome contributions that use any study system, from micro- to macro-organisms, and any combination of field, laboratory, and/or process-modeling approaches to explicitly consider how variation in organismal traits influences ecosystem function. We particularly encourage submissions by early career researchers as well as by researchers from BIPOC, LGBTQIA+, and other marginalized identities.

Keywords: trait-based ecology, functional traits, structure-function relationships, biogeochemistry

SS28 Reshaping Aquatic Food Webs in a Changing World: Challenges and Responses to Drivers of Transformative Change

Tyler Butts, University of Wisconsin-Madison ([email protected])
Holly Embke, United States Geological Survey ([email protected])
Joseph Mrnak, University of Wisconsin-Madison ([email protected])

Aquatic ecosystems face unprecedented challenges due to the rapid pace of global change, resulting in changes in water temperature, increasing eutrophication, and shifting species assemblages. These drivers are altering ecosystems worldwide, impacting their structure, dynamics, and function. Food webs offer a powerful framework to better understand changes within aquatic ecosystems, as trophic interactions and food web structure heavily informs ecosystem structure, function, and long-term dynamics. However, disturbances such as changes to the native biotic community, shifts in climate patterns, and invasive species can reshape food webs, creating novel dynamics and trophic interactions. These changes can be either positive, negative, or benign for ecosystem health and function. For instance, the introduction of an aquatic zooplanktivore may outcompete native zooplanktivores, leading to a proliferation of phytoplankton. Conversely, the reintroduction of a native species could lead to the extirpation of a prolific invasive species. In this session, our aim is to synthesize our current understanding of food web ecology in the context of ongoing global change. We are particularly interested in studies that examine how food webs have been reshaped over time following discrete or continuous disturbances. We encourage studies that advance our understanding of the interplay between food web structure and ecosystem function and dynamics. This includes exploring concepts like trophic cascades, top-down and bottom-up control, species removals and(or) additions, as well as temporal and spatial variations in food web dynamics. Further, we encourage discussion related to adapting to food web shifts. Understanding how food webs change in response to global drivers is critical for enhancing our fundamental knowledge of aquatic ecosystems and developing effective environmental policies and management practices. Indeed, in these trying times of rapid non-linear and dynamic change, there is a need for more ‘food web thinking’.

Keywords: food webs, disturbance, long-term dynamics, adaptation, food web management

SS29 Limnology of polar environments

Hilary Dugan, University of Wisconsin–Madison ([email protected])
Arial Shogren, University of Alabama ([email protected])
VĂĄclava (Vendy) HazukovĂĄ, University of Maine ([email protected])

Polar inland waters, encompassing Arctic and Antarctic regions, are experiencing unprecedented environmental changes. Warming air temperatures and shifting precipitation patterns are leading to shortened ice durations, novel flow regimes, and altered ecosystem dynamics, affecting the biodiversity and functioning of polar lakes and rivers. This session aims to bring together scientists from diverse disciplines to share their research findings, discuss key issues, and identify future directions for understanding the implications of long-term changes on ecosystem dynamics and hydrological processes in polar environments. Through this multidisciplinary session, we aim to foster collaboration and facilitate the exchange of knowledge among researchers working on various aspects of polar limnology to better understand global change.

Keywords: Polar, Arctic, Antarctic, Ice, Permafrost

SS30 Exploring signals and mechanisms of long term change in river dynamics

Joanna Carey, Babson College ([email protected])
Kathi Jo Jankowski, USGS ([email protected])

River systems link terrestrial and marine landscapes through a range of interconnected and complex ecological, hydrologic, and biogeochemical processes along the land-ocean continuum. Rivers are susceptible to perturbations in both terrestrial and aquatic systems, and understanding these changes provides an integrated understanding of impacts of human disturbance on systems. This session aims to explore how rivers are responding to anthropogenically-driven perturbations over time, ideally over decadal timespans. We welcome presentations encompassing a wide variety of river types spanning river order, biome type, seasonality, and ecological condition, as well as exploration of the mechanisms driving such changes. Contributions may include observational and experimental data, as well as empirical and modeling analyses, but should focus on understanding long-term change in river ecosystems. For example, presenters may wish to demonstrate how discharge, nutrients, light availability, or species composition is changing over decadal time spans, as well as potentially explore the mechanisms driving such shifts. We hope to bring together individuals interested in better understanding how and why river systems are changing over time with respect to variety of eco-hydro-biogeochemical processes to improve our ability to forecast and manage future change.

Keywords: rivers, long-term change, ecology, hydrology, biogeochemistry

SS31 Get STOICH-ed for ecosystems: ecological stoichiometry at the ecosystem-scale

Carly Olson, University of Nebraska - Lincoln ([email protected])
Jessica Corman, University of Nebraska-Lincoln ([email protected])
Patrick Kelly, Wisconsin Department of Natural Resources ([email protected])
Nicole Wagner, Oakland University ([email protected])
Stephanie Shousha, University of Montreal ([email protected])

Ecological stoichiometry, generally defined as the study of the total and relative amounts of elements in ecological interactions, has provided powerful insights into biological and ecological processes across various scales. Organisms require nutrients in particular ratios to achieve metabolic processes such as homeostasis and growth. These ratios, or stoichiometric requirements, can be mismatched relative to their food source and environment. These mismatches can have important implications for evolutionary processes, trophic interactions, and biogeochemical cycling through changes in community structure and consumer driven nutrient recycling. Ecological stoichiometry provides a useful lens to understand ecosystem or landscape-scale questions such as biogeochemical or food-web responses to environmental change; however, the concept can also be scaled to the ecosystem-level to understand how human activities have influenced what entire ecosystems receive. Ecosystem stoichiometry thus considers the ecosystem as the organism, with its own metabolism that can process and transform the surrounding material it receives. This session aims to assemble the various definitions and applications of ecosystem or landscape-scale stoichiometry. Further, we will initiate conversations about how we can systematically leverage ecological stoichiometry at these larger scales of organization to predict aquatic ecosystem responses to environmental change. We welcome contributions that pertain to the stoichiometry of cross-ecosystem flows, ecosystem resource supply and demand, how organismal stoichiometric traits vary across the landscape or contribute to ecosystem-scale processes, or the stoichiometry of ecosystem pools and fluxes. While ecological stoichiometry has traditionally focused on the elements carbon, nitrogen, and phosphorus, we will accept research abstracts that consider other biogeochemically relevant elements like silica, calcium, etc. We especially encourage contributions that address the implications of environmental change on ecosystem and landscape stoichiometry and how that may influence ecosystem function.

Keywords: coupled biogeochemistry, stoichiometry, ecosystem, landscape, carbon and nitrogen and phosphorus

SS33 Macroalgae and macrophytes in a changing world

Jessica Gould, Northeastern University ([email protected])
Natasha Leclerc, University of Toronto ([email protected])
Tom Bell, WHOI ([email protected])
Aron Stubbins, Northeastern University ([email protected])

Implications of the meteoric rise in atmospheric CO2 concentrations on natural and human systems are far reaching. It is imperative that CO2 emissions are reduced, but even the most optimistic scenarios for future emissions indicate mitigation will be required (e.g. carbon capture) and that the natural ecosystems and food supply systems critical to human wellbeing will be impacted. Global macroalgal and macrophyte health and resilience is central to a healthy planet. Macroalgae and macrophytes are at the nexus of the climate crisis as they are both vulnerable to climate change and have roles to play in delivering a sustainable future. Not only are they foundational species in the aquatic environment, oxygenating surface waters, providing habitat structure and fueling higher trophic level organisms, but they also provide humans with ecosystem services including carbon sequestration/removal, sources of human nutrition, animal feed, and biofuels. However, macroalgae and macrophytes are particularly vulnerable to climate change and environmental degradation. For example, crustose coralline and fleshy macroalgal species alike are distributed across the globe from the tropics through the high Arctic, including some of the fastest changing ecosystems on earth. As aquatic environments change, the fate of these communities, the ecosystems they support, and the carbon they sequester is poorly understood. Plants and algae can also tell us about past climate and their own history, to offer clues about our shared future. For example, past environmental variability (e.g., in temperature and sea-ice extent) can be reconstructed using macroalgae by investigating the growth and chemical makeup of long-lived marine coralline algae. The variations in these species’ distributions and physiologies through time as climate changed also offer insight into how they may respond to ongoing climate change. This session welcomes research across all macroalgae (including fleshy and coralline species) and macrophyte species, from all geographies (tropical to Arctic and marine to fresh water), and all perspectives concerning macroalgae and macrophytes in a changing world. Examples of topics welcomed include (i) the effects of environmental variability on macroalgal and macrophyte growth and biogeography, (ii) implications of change on coralline algal growth for reconstruction of the environment, (iii) macroalgal and macrophyte cultivation and associated applications – aquaculture, human consumption, biofuels, animal feed, and carbon dioxide reduction/sequestration (CDR) (iv) remote sensing, monitoring, and mapping of productivity. We hope this session will improve collaboration across disciplines within and between the macroalgal and macrophyte research community and accelerate our ability to understand, protect, and harness aquatic macro-photosynthesizers as we seek to build the good, sustainable Anthropocene.

Keywords: Macroalgae, Climate Change, Carbon Cycle, Carbon Sequestration, Macrophyte

SS35 Tracing ecological and environmental dynamics via stable isotope analysis

Yoshito Chikaraishi, Hokkaido University ([email protected])
Kyung-Hoon Shin, Hanyang University ([email protected])
Shawn Steffan, University of Wisconsin-Madison ([email protected]
Hyuntae Choi, Hokkaido University ([email protected])

Insights from stable isotope analysis have resulted in significant advances in the study of biogeochemistry, ecology, and environmental science. In particular, compound-specific isotope analysis (CSIA) of organic compounds have emerged as powerful tools for providing unprecedented accuracy in the understanding of ecological and environmental dynamics across aquatic and terrestrial systems. In this session, we bring together a diverse group of scientists who have used stable isotope analysis, including bulk and CSIA, to develop novel theoretical and applied approaches to solving broad, overarching questions relating to ecology, evolution, and sustainability in aquatic ecosystems.

Keywords: Stable isotope, biogeochemistry, ecology, environmental science

SS36 Climate change impacts on inland fish and fisheries

Olaf Jensen, Center for Limnology, University of Wisconsin-Madison ([email protected])
Ashley Trudeau, Center for Limnology, University of Wisconsin-Madison ([email protected])
Zachary Feiner, Center for Limnology, University of Wisconsin-Madison and Wisconsin Department of Natural Resources ([email protected]

Climate change has already dramatically altered many inland waters through a combination of warming water, changes in phenology, and alterations to aquatic food webs. All of these forces can alter the growth, reproduction, survival, and behavior of fishes. Because these changes can influence fishes’ complex interactions with their habitat, predators, prey, and competitors, climate change can cause shifts in fish community composition that are difficult to prevent or reverse. Yet fishes also have the capacity to adapt to a changing environment through, for example, use of thermal refugia or changes in diet and habitat use. These adaptations may buffer the direct effects of climate change on fish populations, but may also involve trade-offs - e.g., thermal refugia may have few prey resources. For fish species targeted by recreational, commercial, Tribal, or subsistence fisheries, changes in fishing behaviors may further challenge our ability to understand and predict climate change impacts. For example, as many coolwater fishes face climate-driven declines in productivity, will fishers switch to targeting warmwater species and thus provide coolwater species with a compensatory reduction in fishing mortality? And how might managers encourage and leverage such stabilizing social-ecological feedbacks in order to confer greater resilience on harvested fish populations under climate change?

This session will integrate research from a broad range of disciplinary perspectives seeking to understand the impacts of climate change on inland fish and fisheries. We welcome submissions focused on all mechanisms by which climate change is altering the biology, ecology, or fisheries of inland fishes. We also welcome talks that address management of inland fisheries under climate change and the social or economic consequences of climate change impacts.

Keywords: adaptation, climate change, fish, fisheries, resilience

SS37 Carbon and nutrient fluxes under climate change: Cycling, retention and impacts along the aquatic continuum from land to coastal ocean.

Serghei Bocaniov, University of Waterloo, Ontario, Canada ([email protected])
Serghei Bocaniov, Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada ([email protected])
Zahra Akbarzadeh, Department of Earth and Environmental Sciences, University of Waterloo, Waterloo ([email protected])
Sergei Katsev, Large Lakes Observatory, University of Minnesota at Duluth ([email protected])
Philippe Van Cappellen, Department of Earth and Environmental Sciences, University of Waterloo ([email protected])

Pressures on aquatic ecosystems, such as rising nutrient emissions, more extreme weather patterns, permafrost thaw, land use changes, water diversions, and intensified coastal shoreline erosion, are accompanied by regional to continental scale alterations of the biogeochemical cycles of carbon and nutrients, from land to the coastal ocean. Given the complexity of the interactions between climate change, human activities, and ecosystem responses, integrated data acquisition and modeling tools are required to assess and predict the sources and sinks of carbon and nutrients, including phosphorus, nitrogen, silicon, and iron, along the aquatic continuum. This session will highlight advances, as well as remaining knowledge gaps, in our qualitative and quantitative understanding of the evolving speciation, loadings, transport pathways, retention mechanisms of carbon and nutrients in inland waters and nearshore marine environments. An important outcome will be to evaluate the extent to which our current scientific understanding can guide the management of aquatic ecosystems and reduce the risks associated with, for example, the strengthening of water column stratification, nutrient enrichment, and changes in nutrient limitation patterns of lakes and coastal marine systems. Further topics of interest include but are not limited to: the coupling of physical and biogeochemical processes controlling nutrient retention along the aquatic continuum; projected terrestrial carbon and nutrient inputs to aquatic systems under variable climate change scenarios; greenhouse gas emissions from aquatic ecosystems; nearshore-offshore and inter-basin exchanges in large lakes; aquatic photosynthesis, sediment and water column respiration as sentinels of aquatic food web perturbations and drivers of biogeochemical cycling; elemental and material mass balances and related modeling and accounting approaches; estimating chemical loadings to rivers; environmental indicators; environmental management and policies for mitigation and adaptation to climate change. The session will be open to research contributions ranging from field observations and experimental studies, to data-driven machine learning and mechanistic modeling of nutrient and carbon dynamics in aquatic environments, and from local to global scales. We especially welcome presentations that address the responses of the aquatic carbon and nutrient cycles to climate change and other anthropogenic forcings and interventions in the hydrological cycle.

Keywords: carbon and nutrient cycles, climate change, eutrophication, lakes, coastal zone

SS38 Mercury biogeochemistry in a changing world

Benjamin Peterson, University of Wisconsin Madison ([email protected])
Sarah Janssen, U.S. Geological Survey - Mercury Research Laboratory ([email protected])

Mercury is a ubiquitous pollutant that can result in the contamination of aquatic food webs and is a leading cause for fish consumption advisories worldwide. Once in aquatic ecosystems, mercury enters a complex biogeochemical cycle that includes ligand complexation, photo-chemistry, and microbial transformations. These processes culminate with the formation of toxic methylmercury by microorganisms, which is the key step leading to bioaccumulation and biomagnification of mercury in the food web. The balance between these transformation processes thus determines the extent of mercury uptake into the food web, evasion back to the atmosphere, or burial in sediments. These processes are dictated by an array of biogeochemical factors such as organic matter composition and concentration, redox conditions, water quality, and microbial community activity. While we expect to see declines in mercury releases to the environment in the coming years, other local and global changes, such as eutrophication, climate change, and biological invasions, are also expected to alter these biogeochemical cycles and subsequent biological mercury burdens. Emerging tools in the field, such as stable isotopes and microbial metagenomics, have improved our ability to understand the biogeochemical mechanisms underlying mercury transformation, which is critical to modeling and predicting changes in mercury cycling in response to global and regional change. For this session , we invite abstracts that focus on identifying specific biogeochemical drivers of mercury transformation in aquatic ecosystems including chemical and microbial studies as well as modeling approaches. Specific emphasis will be placed on presentations that use interdisciplinary approaches, emerging techniques, and investigate how local or global changes are influencing the mercury cycle.

Keywords: Mercury, Biogeochemistry, Contaminants

SS39 cHABs as a response to ecosystem disturbance

Mary Anne Evans, U S Geological Survey ([email protected])
Elena Lichtman, Carnegie Institution for Science ([email protected])
Rebecca Gorney, USGS – New York Water Science Center ([email protected])

Cyanobacterial Harmful algal blooms (cHABs) continue to be reported with increasing frequency in freshwater systems globally. cHABs are a perennial issue in many eutrophic areas but occur across nutrient and temperature gradients and in many relatively unimpacted lakes. These recent changes in the distribution and severity of cHAB events challenges widely-used models that rely upon nutrient loads and autecological preferences of individual species to explain blooms. Relationships between cyanobacterial species and environmental drivers are complicated by the inherent genomic and metabolic flexibility of cyanobacteria, as well as marked taxonomic ambiguity within the division, and further confounded by environmental stochasticity, anthropogenic disturbance, and interactions with non-cyanobacterial algae and other microbes. Many of the systems that are experiencing increasing cyanobacterial dominance and associated cHAB events are not warm, eutrophic, or otherwise impacted in an absolute sense. However, many are undergoing rapid change as a result of climate change, watershed modifications, and non-indigenous species. This session will gather research and encourage discussion around blooms in unexpected places, cyanobacterial bloom formers as opportunistic species, increasing cyanobacterial relative abundance in low biomass systems, and the microbial and algal community ecology of cHABs.

Keywords: HABs, community, disturbance, phytoplankton, blooms

SS40 Expect the unexpected: Why are algae blooms increasing in our most "pristine” aquatic ecosystems?

Adam Heathcote, Science Museum of Minnesota ([email protected])
Lienne Sethna, Science Museum of Minnesota ([email protected])
Janice Brahney, Utah State University ([email protected])
Chris Filstrup, University of Minnesota Duluth ([email protected])

Algae blooms are increasingly reported in unexpected places, including remote and protected aquatic ecosystems. This session asks "What is behind these blooms and how can we better predict them in the future?” Emerging research has suggested a suite of potential drivers for these blooms, including climate change, atmospheric nutrient deposition, alkalization of soils, and the introduction of aquatic invasive species. Because the timing of these human-caused disturbances covary over the last half-century, disentangling the relative effects requires careful consideration. We welcome a wide variety of submissions, including event-based monitoring, experimentation, paleolimnology, and computational modelling, that discuss these or other drivers and help us better understand how they may be working independently or in concert to produce previously unexpected results.

Keywords: Algae Blooms, HABs, Climate Change, Atmospheric Deposition, Cyanobacteria

SS41 Airborne: Assessing the Impacts of Atmospheric Deposition on Aquatic Ecosystems

Diane Lauritsen, LIMNOSCIENCES ([email protected])
Janice Brahney, Utah State University ([email protected])

Aquatic ecosystems can be greatly impacted by changes in atmospheric chemistry caused by emissions associated with human activity (agricultural, industrial, energy, urban, transportation) as well as those related to climate change (such as soot from large-scale wildfires, and dust from increasingly drought-prone regions).  We invite scientists who are working in a wide range of aquatic ecosystems that are being impacted by atmospheric deposition to participate in this session.   We particularly encourage submissions from scientists who are monitoring atmospheric deposition of nutrients from wet and dry sources, and scientists who are monitoring changes in ecosystem nutrient dynamics and assessing how aquatic organisms are adapting.  Submissions related to other types of deposition (mercury, emerging contaminants) and how aquatic ecosystems are adapting to them are also welcomed.

Keywords: Nutrients, Nitrogen, Primary Productivity, Wet Deposition

SS42 Ecological Forecasting as a Tool for Adaptation and Mitigation in Aquatic Ecosystems

Mary Lofton, Virginia Tech ([email protected])
Rafael MarcĂ©, Institut CatalĂ  de Recerca de l'Aigua ([email protected])
Cayelan Carey, Virginia Tech ([email protected])

Ecological forecasting – i.e., making iterative predictions about the future state of ecosystems that account for uncertainty and are updated with new data as they become available – can be a critical tool for the management of aquatic ecosystems. Forecasts of the future state of aquatic ecosystems (e.g., water quantity, water quality, fisheries) are increasingly needed as global change precludes the use of historical conditions for guiding predictions of future aquatic conditions. Recent advances in data availability and ecosystem models have positioned aquatic researchers to increase their use of forecasting for prediction of stream discharge, fisheries, hypoxia, algal blooms, endangered and protected species, drinking water availability, and other metrics of ecosystem functioning. Forecasts benefit a variety of users, including managers, policymakers, and the public, for purposes ranging from preemptive mitigation of water quality and quantity concerns to adaptively protecting aquatic biota and planning recreational activities. Forecasting also allows researchers to refine ecological theory by repeatedly confronting models with data, thereby improving models over time. In this session, we solicit diverse presentations on both methodological and application-based research on forecasting hydrodynamics, biogeochemistry, and ecology in aquatic ecosystems. We invite submissions that examine the role of forecasting to support adaptation and mitigation by engaging management, industry, communities, and other decision-makers in the face of climatic extreme events and other environmental challenges. Our overarching goal is to illuminate the value of ecological forecasting as an approach for guiding climate change adaptation and mitigation in aquatic ecosystems.

Keywords: forecasting, data science, decision-making, management, modeling

Amplifying Voices Session

The Amplifying Voices session is for early career presentations that will be prerecorded and shown at the meeting.

AV01 Amplifying Voices in a Changing World

Mina Bizic, Leibniz Institute of Freshwater Ecology and Inland Fisheries ([email protected])
Cale Gushulak, University of Regina ([email protected])
Ngozi Oguguah, Nigerian Institute for Oceanography and Marine Research ([email protected])
Pascal Bodmer, Cornell University ([email protected])
Bianca RodrĂ­guez-Cardona, UniversitĂ© du QuĂ©bec Ă  MontrĂ©al ([email protected])
Members of the Early Career Committee Association for the Sciences of Limnology and Oceanography, ASLO ([email protected])

In an era of accelerating global change, it is imperative that research efforts span international and multidisciplinary boundaries to ensure more inclusive, holistic, and creative solutions to pressing environmental challenges. To facilitate increased global collaboration and networking opportunities for early career researchers (ECRs*), the Early Career Committee (ECC) of the Association for the Sciences of Limnology and Oceanography (ASLO) has been hosting a series of online "Amplifying Voices” webinars in an effort to highlight the work of ECRs from underrepresented** groups. In this session, we bring the "Amplifying Voices” webinar to the ASM 2024. We specifically invite ECRs from around the globe who are otherwise unable to attend the conference in person but would like the opportunity to present their research to conference attendees in a pre-recorded format. Rising temperatures, shifting precipitation patterns, and encroaching sea levels collectively reshape the delicate balance of aquatic environments with far-reaching consequences affecting the distribution, behavior, and abundance of freshwater and marine species. Thus, we welcome all talks addressing the pervasive impacts of climate change on aquatic ecosystems.

Session format: Upon the abstract submission deadline, the ECC will take one of two actions: either forming a standalone session based on the similarity of proposed topics or distributing the abstracts to the appropriate sessions according to topics. The selected talk will be given the title 'Amplifying Voices in: Your Topic’. Abstract submission fees are not in effect for this session, and if accepted, participants in this session will have their registration fees waived as they will not be attending the conference in person.

*ECR in this context includes both PhD students and non-tenured researchers who have received their highest degree within the last 10 years.

**These include ethnic origin and ethnicity, disability, sex, gender, and sexual orientation, or any other component of identity underrepresented in science, which may greatly vary in different countries.

Keywords: Early Career, Aquatic Ecosystem, Ecosystem Transformation, Global Change, Inclusive Solutions & DEIJ

Education and Policy Session

EP01 Innovative approaches and tools for advancing aquatic scientific education

Cayelan Carey, Virginia Tech ([email protected])
Mary Lofton, Virginia Tech ([email protected])
Cailin Huyck Orr, Science Education Research Center at Carleton College ([email protected])

The disciplines of limnology and oceanography are rapidly evolving due to increasing pressure on aquatic ecosystems because of global change, motivating the development of new empirical and modeling approaches. For example, aquatic scientists are increasingly analyzing large datasets obtained through sensor networks and remote sensing, enabling new analyses and models of ecological phenomena over an increasing range of temporal and spatial scales. Conducting these “big data” analyses and modeling, as well as interpreting their results, requires advanced skills in data collection, data manipulation, experimental design, quantitative reasoning, and data analysis. Moreover, in addition to these technical skills, students need the team science skills to collaborate with interdisciplinary researchers and community members, as diverse teams are increasingly needed to address pressing aquatic science challenges due to global change. Despite the increasing importance of all of these skills, however, they are not commonly taught in aquatic science undergraduate and graduate classrooms. We seek both oral and poster presentations that highlight innovative approaches, tools, and training programs that are advancing aquatic science education at all levels. Our aim is to showcase examples of how instructors in the ASLO community are creatively pushing the envelope of aquatic science training and enabling students to learn new concepts and develop the skills necessary to conduct 21st century limnology and oceanography. We ask instructors to share how their educational tools or training programs can be scaled to other teaching and learning contexts, so that education can truly be the tide that raises all boats (i.e., benefit all members of the aquatic science community). We note that ASLO 2024 attendees are allowed to submit a second abstract to an education session in addition to other research sessions, per ASLO policy.

Keywords: education, graduate students, pedagogy, training, undergraduate students

Tribute Sessions

TR01 Bob Sterner: Celebrating A Career Full of Stoichiometry, Lakes of Many Sizes, and Thoughtful Science

Jim Elser, University of Montana ([email protected])
Jim Cotner, University of Minnesota ([email protected])

Bob Sterner has had an outsized influence on limnology, aquatic sciences, and ecology more broadly. From his early research on consumer resource competition and nutrient regeneration to his classic tome with Elser on ecological stoichiometry, his insightful and creative perspectives have changed the way that we see ecological interactions in lakes, oceans, and indeed all ecosystems, including some that are not even wet! Bob has always been fascinated by phytoplankton and his early work focused on the reciprocal ways that phytoplankton affect herbivores via food quality and that herbivores influence phytoplankton via effects on the availability of nitrogen and phosphorus. That phytoplankton thread has continued to the work he is doing today to understand some of the drivers of increasing cyanobacterial blooms globally, paradoxically even in some of the least productive systems on the planet such as Lake Superior. Ecological stoichiometry has always been at the center of Bob’s work. Through the direct influence of Dave Tilman and Sue Kilham, as well the classic work of AC Redfield and GE Hutchinson, Bob has fundamentally changed our understanding of the role of organisms and stoichiometry in the ecological realm, whether it be via the impacts of stoichiometric food quality or the drivers that force elemental imbalance in ecological interactions and ecosystems. His work on the latter has been particularly relevant to our understanding of ongoing human influences on lakes.

So let’s hang out, talk about stoichiometry, Daphnia, large and small lakes, chemostats, and whatever but especially let’s share some stories about Bob, and celebrate what has been an impactful career!

Keywords: Daphnia, ecological stoichiometry, large lakes, chemostats, theory

TR02 From Phosphorus to Fish: Celebrating the Free-ranging Career of Steve Carpenter

Elena M. Bennett, McGill University ([email protected])
Emily Stanley, University of Wisconsin ([email protected])
Jim Elser, Flathead Lake Biological Station, University of Montana ([email protected])

Sustaining aquatic ecosystems under global change requires scientific knowledge working in collaboration with ecosystem management and society. This session will focus on key areas of scientific knowledge and management collaboration driven forward by the career of noted aquatic ecologist Steve Carpenter. Each talk will focus on one research topic, and discuss how Carpenter’s work contributed to our current knowledge and explore key future directions for research in this area. Research areas will include: trophic cascades, aquatic food webs, freshwater fisheries management, ecosystem manipulations, eutrophication and phosphorus as a slow variable, scenario development, working with decision-makers, and resilience.

Keywords: phosphorus, trophic cascade, resilience, ecosystem manipulations, freshwater fisheries management

TR03 The Changing Carbon Cycle of Inland Waters: A Special Session in Memory of Jonathan J. Cole

Michael Pace, University of Virginia ([email protected])
Grace Wilkinson, University of Wisconsin-Madison, Center for Limnology ([email protected])

Jon Cole was a leader in local and global study of inland waters. His work on the over-saturation of CO2 in freshwater, the importance of terrestrial organic inputs to inland waters, and the role of inland waters in the global carbon cycle was influential. He also inspired and encouraged many aquatic scientists as a mentor and colleague. This session will focus on contemporary analyses of the inland water carbon cycling that update and advance on the topics considered by Cole as well as new topics. Contributions are welcome on all aspects of carbon cycling in inland waters including but not limited global carbon dynamics, gas emissions, dissolved inorganic carbon dynamics, dissolved organic carbon dynamics, terrestrial carbon inputs and utilization, methane production and consumption, application of carbon isotopes. Contributions are also encouraged from individuals who worked with Cole especially during their early career phase and who can reflect on how his ideas and work are influencing current research.

Keywords: Dissolved Organic Carbon, Particulate Organic Carbon, Dissolved Inorganic Carbon, Carbon Isotopes, Terrestrial Organic Matter

Contributed Sessions

CS04 Aquatic Invasion Ecology

R Keller, Loyola University Chicago ([email protected])

CS09 Community Ecology

MarĂ­a GonzĂĄlez, Miami University ([email protected])

CS12 Fish and Fisheries

Elizabeth Everest, University of Nevada, Reno ([email protected])
Zachary Bess, University of Nevada, Reno ([email protected])

CS16 Nitrogen Biogeochemistry and Cycling

Matthew Church, University of Montana ([email protected])

CS20 River and Stream Ecology

James Hood, Ohio State University ([email protected])

CS23 Urban Ecosystems

Jacques Finlay, University of Minnesota ([email protected])

CS26 Plankton Ecology

Kerri Finlay, University of Regina ([email protected])
Angela Strecker, Western Washington University ([email protected])
Beatrix Beisner, University of Quebec at Montreal ([email protected])

Scroll to Top