2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 2:00 PM - 2:15 PM | A PALEOLIMNOLOGICAL HISTORY OF EUTROPHICATION IN UTAH LAKE | 254 B
A PALEOLIMNOLOGICAL HISTORY OF EUTROPHICATION IN UTAH LAKE
Anthropogenic increases of phosphate availability can have negative impacts on lake ecosystems through increased harmful algal blooms, reduced visibility, and reduced macrophyte cover. Utah Lake is a large shallow lake located in north-central Utah and features the hallmark indicators of a turbid eutrophic lake. Despite local debate regarding the cause of eutrophication, there is no empirical record as to whether this lake’s waters were historically clearer and if so, when the transition occurred. We used a paleolimnological approach to identify and reconstruct shifts in macrophyte production and community composition. Preliminary organic carbon, nitrogen, and fossil data indicate a transition in the lake’s recent history marking a shift from macrophyte to phytoplankton dominance. We further use sediment eDNA to explore macrophyte and phytoplankton community shifts associated with the transition. This study will provide a historical framework for the timing of environmental shifts as they may relate to various anthropogenic forcing in the catchment and lake. It will also explore the possibility of an ecological tipping point from a mesotrophic to eutrophic regime in a large, shallow lake.
- Sediment
- Macrophyte
- Phytoplankton
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Presenters/Authors
Leighton King
(), Utah State University, leighton.r.king@gmail.com;
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Soren Brothers
(), Utah State University, soren.brothers@usu.edu;
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Janice Brahney
(), Utah State University, jbrahney@gmail.com;
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