EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/06/2017 | 9:30 AM - 9:45 AM | DIVERGENT RESPONSES IN WATER QUALITY TO INVASION-INDUCED FOOD WEB CHANGES IN A EUTROPHIC LAKE | 305A
DIVERGENT RESPONSES IN WATER QUALITY TO INVASION-INDUCED FOOD WEB CHANGES IN A EUTROPHIC LAKE
Invasive species can change the functioning of freshwater ecosystems as a result of complex species interactions. Outbreak of the invasive predatory zooplankton, spiny water flea (Bythotrephes longimanus) in Lake Mendota, WI (USA) led to decline in the keystone herbivore Daphnia pulicaria, and in turn, water clarity. We use a 20-year dataset for Lake Mendota and adjacent, invaded Lake Monona to evaluate interactions among nutrients, zooplankton, and phytoplankton that manifested in an invasion-induced trophic cascade. We found that diatom biomass increased in both lakes, driving lower water clarity. However, cyanobacteria biomass did not change in either lake. Multivariate time series analysis revealed that diatoms are likely limited by D. pulicaria grazing while cyanobacteria are more likely limited by nutrients in Lake Mendota. Phosphorus concentrations and export in Lake Mendota have declined with Bythotrephes despite no clear change in loading. Accordingly, the number of beach closures in Lake Mendota due to potentially harmful cyanobacteria blooms decreased despite declining water clarity, suggesting a divergent response in water quality to invasion. Uncoupling of these components of water quality under a food web shift has important implications for water quality management in eutrophic lakes.
- C25 Food Webs
- C27 Landuse and Non-Point source Impacts
- C26 Invasive Species
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Presenters/Authors
Jake Walsh
(), University of Wisconsin - Madison Center for Limnology, jransom.walsh@gmail.com;
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