2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 2:45 PM - 3:00 PM | DETERMINANTS OF RESOURCE USE BY RAINBOW TROUT IN MOUNTAIN LAKES | 253 AB
DETERMINANTS OF RESOURCE USE BY RAINBOW TROUT IN MOUNTAIN LAKES
Basal sources of carbon to lake food webs flow from terrestrial, pelagic, and littoral habitats. It is well established that aquatic consumers acquire carbon from across these habitats in varying proportions, yet the factors that influence this variability are not well understood. Here, we leverage the relatively simple food webs, yet complex shorelines and bathymetries, of mountain lakes to address the question of how the relative availability of habitat determines resource use by rainbow trout. We collected samples of rainbow trout, pelagic seston, benthic-littoral periphyton, and terrestrial organic matter across 16 mountain lakes in western Washington. Samples were analyzed for the stable isotope ratios of carbon and nitrogen. We found that as proportional availability of littoral-benthic habitat in mountain lakes decreased, the littoral-benthic contribution of carbon to fish biomass decreased. Our findings suggest that despite preferential use of littoral-benthic resources, rainbow trout exhibit flexibility to adjust resource use according to lake characteristics. This suggests relative stability of the high-lakes fishery in light of the potential changes to the proportional availability of basal resources resulting from climate change and human water drawdowns.
- Food Webs
- Fish
- Algae
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Presenters/Authors
Rebekah Stiling
(), University of Washington, stilir@uw.edu;
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Julian Olden
(), University of Washington, olden@uw.edu;
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Gordon Holtgrieve
(), University of Washington, gholt@uw.edu;
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