This session is designed to provide a venue for undergraduate and beginning graduate students to give their first platform presentations at an ASLO meeting. It is hosted by the ASLO Multicultural Program, but open to all students who have never presented in an oral session at ASLO. The session is moderated by students and conducted in such a way as to provide a friendly and encouraging atmosphere.
Nitrogen is one of the most biologically important elements on earth and is often the nutrient limiting primary production in aquatic systems. While a great deal is known about the fate and functions of dissolved inorganic nitrogen (DIN) in aquatic systems, relatively little is known about the sources, sinks, cycling or composition of dissolved organic nitrogen (DON). This is surprising as DON often exceeds DIN concentrations, representing up to 85% of total dissolved nitrogen pool. DON was once believed to be primarily refractory due to its relatively high and stable concentrations. We now know that DON is a chemically complex mixture with fractions of the DON pool being extremely labile. The development of new analytical techniques has changed the way we think about DON, its functions in aquatic systems, and its roles in the global nitrogen cycle. The focus of this session is to highlight our current knowledge of the sources, sinks, cycling, and composition of DON across aquatic environments. We encourage entries from freshwater, brackish, marine, and atmospheric systems including chemical, biological and physical investigations to foster cross-disciplinary discussions. We specifically encourage studies using state-of-the-art analytical techniques to investigate DON production, cycling, composition, bioavailability and transport at all scales.
Conveners:Russell Cuhel, University of Wisconsin-Milwaukee Center for Great Lakes Studies, email@example.com; Carmen Aguilar, University of Wisconsin-Milwaukee Center for Great Lakes Studies, firstname.lastname@example.org
Increasingly complex, large-scale studies of aquatic ecosystems require broadly-trained yet disciplinarily-expert scientists for the 21st Century. A variety of laboratory research opportunities, from grant-supported undergraduate assistants to programmatic offerings such as the NSF-OCE Research Experience for Undergraduates (REU) Sites offer a valuable introduction to research activities and lifestyles. Distributed among a wide variety of aquatic research institutions, REU Sites in particular provide diverse project and informational experiences. This session specifically offers ANY undergraduates an opportunity to present their research findings in a collegial but lower-stress poster session amid the showcase of full-spectrum aquatic science presentations. Engaged in one of the premier aquatic science meetings of the year, networking and personal interaction facilitate recruitment of top candidates into the career path progression. Research experiences play very important roles in coalescence of a student's classroom learning with real world practice. This poster session showcases project results of mostly upper-division undergraduates working in aquatic science laboratories. All disciplines and many interdisciplinary topics are represented. The presentations provide a fine opportunity for scientists to establish interactions with potential graduate students or employees in a professional setting. The session has grown to be one of the largest single sessions, well attended by actively recruiting scientists.
Conveners:Claudia Dziallas, University of Copenhagen, email@example.com; Hans-Peter Grossart, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, firstname.lastname@example.org; Kam W. Tang, Virginia Institute of Marine Sciences, email@example.com
During the history of life on our planet, acquisition of symbiont-encoded metabolic pathways has allowed organisms to exploit new ecological niches. A mechanistic understanding of the interactions between host and symbionts as well as the role of symbionts in functional diversification and speciation is, however, currently lacking. In addition, the importance of symbioses for niche occupation and matter cycling in aquatic systems is still under-appreciated. Aquatic organisms are densely colonized on their internal and external surfaces by a wide variety of microorganisms, such as bacteria, fungi, algae, and protozoans. With the exception of a few pathogens, knowledge about the ecology of these microbial symbionts is scarce, such as their life cycles, their establishment and maintenance in the hosts, their interactions with adjacent microbes, and evolution of the host-symbiont systems. Eukaryotic organisms present specific microhabitats with very different environmental conditions than the surrounding water, and they may therefore support the proliferation and activities of distinct microbial communities with important biogeochemical consequences. For instance, earlier research has suggested that the guts of zooplankton and fish may support anaerobic microbial processes that otherwise cannot occur in the oxygen-rich water columns. Furthermore, the alteration of the host´s niche can lead to different matter cycling rates and may change biodiversity of the respective ecosystem. We invite researchers to present and discuss all aspects of symbioses in aquatic ecosystems. The goal is to promote exchanges among experts from various fields in highlighting new findings on the molecular and functional ecology of microbial symbioses as well as new conceptual approaches for future studies of symbioses in all aquatic ecosystems. Presentations that link symbioses to water and disease managements or science education are also welcomed.
Conveners:William M. Balch, Bigelow Laboratory for Ocean Sciences, firstname.lastname@example.org; Nicholas R. Bates, Bermuda Institute of Ocean Sciences, email@example.com; Phoebe J. Lam, Woods Hole Oceanographic Institution, firstname.lastname@example.org; Benjamin S. Twining, Bigelow Laboratory for Ocean Sciences, email@example.com
This session welcomes contributions related to the distribution, ecology, physiology, and biogeochemical impacts of coccolithophores in the modern and future ocean as they experience climate change and ocean acidification. The session will focus on interactions between coccolithophores and pCO2, alkalinity, shallow/deep export (carbonate ballasting), marine optics, trace metal and nutrient chemistry. We envision contributions from laboratory, field, and modeling studies, bringing together biological, chemical, biogeochemical and physical approaches.
Despite the global importance of the aquatic environment, it remains temporally and spatially under sampled. Traditionally water samples have been collected and processed in a laboratory. These methods are unable to provide the temporal and spatial resolution that is required to understand the chemical and biological processes taking place within the oceans. They can also be subject to chemical changes, may not reflect the ambient conditions at the time of sample collection and can suffer from contamination due to handling techniques. In situ methods minimise these problems and can provide a much greater sampling rate and distribution. Aquatic sensors use a range of techniques from optical techniques (e.g. optical fibers, hyperspectral imaging, planar optodes, Raman spectroscopy) to wet chemical, electrochemical, eddy correlation and biosensor techniques. Measurements include nutrients, trace metals, carbonate, pCO2, pH, oxygen, sulphide species and pollutants. In addition, challenges common to all sensor development such as their integration onto multiple platforms and instruments (observatories, autonomous underwater vehicles, remotely operated vehicles) and biofouling must be addressed. This session will present some of the latest developments in this important field combining technology, engineering, chemistry, biology and physics.
This session will focus on the challenges and opportunities of teaching introductory oceanography at both 2-and 4-year colleges to a diversity of students. We look for submissions that focus on effective ways to increase student learning of oceanographic concepts, ways in which student learning is assessed, examples of how real-time data is included in the classroom, the challenges and novel approaches for teaching oceanography at the introductory undergraduate level.
Emerging contaminants such as pharmaceuticals, flame retardants, natural plant products, and pesticides have been documented to be present at low levels in many aquatic environments worldwide. This session will involve presentations that describe the variation in the presence and distribution of these chemicals in the aquatic environment, and the impact different emerging contaminants may have on aquatic organisms, communities and ecosystems.
Effective ecosystem management requires a clear understanding of ecosystem organization, function, and response to stressors, including those caused by human activities. This session will include research that uses comparisons across marine ecosystems to provide fundamental understanding of marine ecosystem structure, function and dynamics—with particular emphasis on climate and fishing as agents of change—to foster enhanced prediction and support for ecosystem-based management. We anticipate presentations will cover fundamental research to understand complex dynamics controlling ecosystem structure, productivity, behavior, resilience, and population connectivity, as well as effects of climate variability and anthropogenic pressures on living marine resources and critical habitats. By drawing ecosystem-scale comparisons across environmental gradients and management regimes, we increase our understanding of the underlying principles that organize marine ecosystems and the roles of human actions therein. Additionally, predicting marine ecosystem responses to change is essential to developing ecosystem-based management strategies that will ensure the sustainability of marine resources and the livelihoods of those who depend on them.
Conveners:Stephane Blain, Universite Pierre et Marie Curie, firstname.lastname@example.org; Queguiner, Universite d'Aix-Marseille, email@example.com; Strass, Alfred Wegener Institute for Polar and Marine Research, Volker.firstname.lastname@example.org; Dieter Wolf-Gladrow, Alfred Wegener Institute for Polar and Marine Research, Dieter.Wolf-Gladrow@awi.de
In the macronutrient-rich waters of the Southern Ocean, the biological pump of CO2 is likely controlled by the supply and bioavailability of iron. Through diverse interactions, iron limitation causes co-limitations principally by the light regime or by silicon. These processes are themselves modulated by the biological couplings in the food webs, and iron availability drives the functional structure and the biodiversity within the Southern Ocean ecosystems. Iron impacts the coupling between the different biogeochemical cycles with feedbacks on climate or on the productivity of adjacent ocean basins, possibly affecting the global carbon cycle. Resolving this complex multi-faceted story requires a large international effort which is underway. This session aims to bring together the most recent findings on the following issues: the impact of iron supply on carbon sequestration and atmospheric CO2 drawdown, the interaction between iron availability and the structure, biodiversity, and functioning of pelagic ecosystems, the identification of iron sources and transport pathways, the transformations of iron mediated by biotic or abiotic processes, and the coupling/decoupling between iron and major nutrient biogeochemical cycles. We invite submissions addressing any of these topics, either obtained from the most recent field studies (such as KEOPS2, or Eddy Pump), modeling studies or re-analysis of relevant previous observations.
Conveners:Tom Shatwell, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), email@example.com; Bertram Boehrer, Helmholtz Centre for Environmental Research – UFZ, firstname.lastname@example.org; Klaus Jöhnk, CSIRO Land and Water, Klaus.Joehnk@csiro.au
Poorly mixed lakes are characterized by vertical gradients in physical and chemical parameters like temperature, salinity, density, light, nutrients, oxygen, redox potential, or ionic composition. Biological gradients, like the distribution of plankton and fish, also form as a result. Strong gradients such as the thermocline in holomictic lakes or the chemocline in meromictic lakes can be hotspots of matter conversion, impose barriers to the movement of organisms, particles and dissolved substances, or establish ecological niches. The metalimnion and other internal transition zones are thus highly active regions but also semi-permeable barriers. While limnologists often reduce poorly mixed lakes into two or three separate layers of interest (e.g., surface water, deep water, and sediment), little attention is paid to such interfaces and transition zones. This session will therefore focus on the role of the metalimnion and other internal transition zones in the structure and function of the whole lake system. We invite contributions covering all aspects of physical, chemical and biological processes, where the emphasis lies on the interactions between processes or their effects and feedbacks on the wider lake ecosystem. Examples of interesting questions include: What role does a deep chlorophyll layer play in nutrient cycling and food web dynamics? What are the effects of internal waves on biological and chemical processes? How does a metalimnion or chemical transition zone mediate the transformation and vertical flow of matter and energy? Does a chemocline in a meromictic lake act solely as a trap? Just how big is the sampling error when mixed samples are only drawn from the epilimnion? We hope to achieve an improved understanding of how processes across internal boundaries like the metalimnion influence lakes as a whole, generate new research themes, and highlight new advances towards lake and reservoir management.
Interspecies interactions are at the core of success or failure of microbial species. For example, heterotrophic microbes are notoriously dependent on fixed carbon produced by autotrophic microalgae for survival. At the same time, many autotrophs acquire essential nutrients and metabolites from associated heterotrophic bacteria. Such interactions are an important feature of microbial communities, where synergism or competition among species contributes to ecosystem diversity and biogeochemical cycling. Next generation sequencing technologies and innovative experimental approaches are yielding unprecedented insights into these relationships and interactions and their influence on nutrient cycles. We invite contributions from laboratory and field studies that examine interactions between microbes in aquatic systems and their impact on local or global biogeochemistry. Research highlighting the biogeochemical importance of microbial associations, the role of interspecies communication in mediating interactions, or the role of climate change on microbial interactions is encouraged.
Two-decades of genomics-enabled exploration have revealed the ocean’s major microbial taxa and have begun to constrain their physiological potential. Simultaneously, analytical advances in biogeochemistry have opened new windows into the dynamics of metals and biomolecules in marine systems. While global sectional datasets of nutrients, radiotracers, and the carbon dioxide system continue to elucidate key oceanographic processes, sectional studies of genomes, metals, and biomolecules are also yielding important insights. Combining complementary ocean sections of geochemical, genomic, and biomolecular data has the potential to reveal new feedbacks between global environmental change and the biogeography of marine microbes (e.g. connections between shifts in microbial community structure, migrations of ocean biome boundaries, and alterations in marine ecosystem services). We invite the presentation of studies where sectional genomic or biomolecular datasets have been integrated with sectional geochemical datasets (e.g. GEOTRACES) to explore the biogeochemical functions of microbes in aquatic ecosystems (marine, estuarine, lacustrine). In addition to ocean-basin scale studies, we encourage submissions describing smaller scale studies that might serve as models for future global-scale efforts. Studies utilizing sectional genomic or biomolecular datasests to relate microbial biogeography to geochemical gradients are particularly welcome.