2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2018 | 9:00 AM - 9:15 AM | Asynchronous changes in trophic status of a lake and its watershed inferred from sedimentary diatoms of different habitats | 330 B
Asynchronous changes in trophic status of a lake and its watershed inferred from sedimentary diatoms of different habitats
Paleolimnology is one important approach for setting realistic goals for restoration and management decisions for lakes. Both other lines of evidence, which is evaluated by a form of causal criteria analysis–Eco Evidence, and evidence from Muskegon Lake itself, were analyzed to evaluate whether TP is causal factor for diatom species composition change in Muskegon Lake. Both evidence supported the cause-effect linkage between TP and diatom species composition change. Our data analysis showed benthic and planktonic diatoms responded to changes in phosphorus conditions at two spatial scales. When inferring TP based on species composition of all diatoms, relationships to geochemical proxies and land use were poor. However, when inferring TP using benthic and planktonic diatoms, benthic diatom inferred TP was related most to in-lake conditions and planktonic diatom inferred TP was related most to changes in the Muskegon River, upstream from the lake. Only benthic diatom inferred TP correlated well with geochemical proxies in the lake. With a 23 d residence time of water in Muskegon Lake, species composition of planktonic diatoms in the core was likely more regulated by exogenous environmental factors and processes, Muskegon River, than benthic diatoms.
- Diatom
- Lentic
- Landuse
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Presenters/Authors
Bo Liu
(), Hebei University, liubo3@msu.edu;
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