2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2018 | 10:00 AM - 10:15 AM | COMMUNITY CHARACTERISTICS IN EMERGENT MACROPHYTES OF COASTAL LAKE ERIE WETLANDS: DISSOLVED OXYGEN DRIVER | 430 B
COMMUNITY CHARACTERISTICS IN EMERGENT MACROPHYTES OF COASTAL LAKE ERIE WETLANDS: DISSOLVED OXYGEN DRIVER
Invasive macrophytes, such as European frogbit (Hydrocharis morsus-ranae), may negatively impact wetlands and increase the difficulty to properly manage wetland ecosystems. Thus, the central focus of this study was to determine the abiotic and biotic wetland community characteristics that differentiate aquatic macrophyte habitats. Monotypic patches of four species of macrophytes; European frogbit, flowering rush, water smartweed, broadleaf arrowhead, plus open water were sampled at Ottawa National Wildlife Refuge (Ohio) in July and September 2017 quantifying water chemistry, sediment nutrients, macrophyte biomass, periphyton growth, zooplankton, macroinvertebrates, fish and water birds associated with each habitat. Dissolved oxygen measurements (at sunrise and midday; DO) in European frogbit showed hypoxic conditions consistently < 0.1mg O2/L, whereas DO in all other habitats was always >2.0mg O2/L, sometimes reaching >10mg O2/L. Correlated with low dissolved oxygen levels in European frogbit was significantly lower species diversity of macroinvertebrates, fish, and water birds (P-values < 0.05). We found a significant increase in low DO tolerant species such as Common Carp (Cyprinus carpio) and fewer low DO intolerant species such as Bluegill (Lepomis macrochirus) in European frogbit, thus negatively affecting aquatic communities through environmental changes.
- Invasive
- Macrophyte
- Fish
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Presenters/Authors
Jaimie Johnson
(), Bowling Green State University, jaimiej@bgsu.edu;
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