2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/20/2019 | 2:30 PM - 2:45 PM | EFFECTS OF LAKE TROUT SUPPRESSION METHODS ON AMPHIPODS IN YELLOWSTONE LAKE | 253 AB

EFFECTS OF LAKE TROUT SUPPRESSION METHODS ON AMPHIPODS IN YELLOWSTONE LAKE

Invasive species alter biodiversity, ecosystem function, and food web dynamics worldwide. In Yellowstone Lake, WY, invasive Lake Trout have collapsed the native Yellowstone Cutthroat Trout population. To suppress Lake Trout, the National Park Service deposits Lake Trout carcasses on Lake Trout spawning sites to induce embryo mortality, but effects of carcass deposition on other components of the lake ecosystem are unknown. Amphipods, a dominant benthic invertebrate and major food source for Lake Trout and Yellowstone Cutthroat Trout, could respond to changes in biogeochemistry in the lake's littoral zone when carcasses are deposited. We sampled amphipod populations at three carcass deposition and three control sites in 2018. Because of challenges associated with sampling large water bodies, two sampling approaches were evaluated: a spatially quantitative diver-operated suction sampler and qualitative emergent fry traps. The number of amphipods collected in fry traps was not correlated with the density of amphipods measured in suction samples, indicating that fry traps are not an effective way to quantify amphipod abundance. Results suggest amphipod population size did not change after carcass treatment, which is likely due to the sparse carcass cover achieved at spawning sites in 2018.

Lentic
Management
Invasives

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Presenters/Authors

Michelle Briggs (), Montana State University, michelle.briggs32@gmail.com;