EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 10:00 AM - 10:15 AM | TOP DOWN AND BOTTOM UP DRIVERS OF COMMUNITY ASSEMBLY IN ALPINE LAKES | 251 AB
TOP DOWN AND BOTTOM UP DRIVERS OF COMMUNITY ASSEMBLY IN ALPINE LAKES
Biodiversity is controlled by both biotic and abiotic factors, and the balance and number of these controls remains a key question in understanding ecological community assembly. The interactive effects of top down (fish) and bottom up (nutrients) controls on aquatic biodiversity are poorly understood, particularly in alpine lake environments. Historically, alpine lakes are nutrient limited and fishless. Anthropogenic nutrients and fish introductions could shift the composition of dominant zooplankton taxa yet we do not know the relative contributions of these top down and bottom up effects on community assembly. We are studying these effects on zooplankton assemblages in 42 lakes in the Wind River Range (WRR), Wyoming, which possesses an anthropogenically-derived phosphorus gradient. In lakes with fish predators, zooplankton were 1.8 times smaller, total zooplankton abundance was 4.5 times higher, and zooplankton assemblages were dominated by cladocera. In contrast to many studies of lower elevation lakes, fishless lakes were dominated by copepods, likely because of lower phosphorus availability. Thus, we have evidence of both bottom up effects and top down effects on zooplankton assemblages in alpine lakes.
- Biodiversity
- Nutrients
- Phosphorous
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Presenters/Authors
Lindsey Boyle
(), University of Wyoming, lboyle1@uwyo.edu;
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Amy Krist
(), University of Wyoming, krist@uwyo.edu;
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Annika Walters
(), USGS Wyoming Coop Fish and Wildlife Unit, annika.walters@uwyo.edu;
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Katie Wagner
(), University of Wyoming, Catherine.Wagner@uwyo.edu;
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