Aquatic Sciences Meeting, Albuquerque 2001

CS16 Invasive Species: Benthic and Pelagic Organisms

Date: Friday, February 16, 2001, Time: 9:00:00 AM

Location: Dona Ana

Havel, J, E, Southwest Missouri State University, Springfield, USA, johnhavel@smsu.edu

Shurin, J, B, NCEAS, Santa Barbara, USA, shurin@nceas.ucsb.edu

Jones, J, R, University of Missouri, Columbia, USA, jonesj@missouri.edu

INVASION OF DAPHNIA LUMHOLTZI: DYNAMICS AND REGULATION OF DISPERSAL

Dispersal of aquatic organisms from source populations to open habitat patches is poorly understood. In the current study, we use seven years of distributional data plus GPS coordinates and physiochemical data from 152 Missouri lakes to model the dispersal of an exotic cladoceran. The lakes include reservoirs, oxbows, and flood-scour basins, which cover a wide range in size (3 – 24,000 ha), water clarity (0.1 – 4.3 m Secchi depth), and fertility (8 – 1,600 ug/L total phosphorus). Over the period of study, prevalence of D. lumholtzi increased from 6-35% and long-distance hops frequently established new populations. Flooding and hydrologic connections within reservoirs networks were also important for dispersing populations. We will present logistic regression models, which allow prediction of new populations.

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Aquatic Sciences Meeting, Albuquerque 2001

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