2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 10:00 AM - 10:15 AM | EFFECTS OF DRAWDOWN HISTORY AND VEGETATION TYPE ON AQUATIC INVERTEBRATE DIVERSITY AND BIOMASS IN A MANAGED WILDLIFE AREA | 151 DEF
EFFECTS OF DRAWDOWN HISTORY AND VEGETATION TYPE ON AQUATIC INVERTEBRATE DIVERSITY AND BIOMASS IN A MANAGED WILDLIFE AREA
Invertebrates provide a key source of protein and nutrients for waterfowl during breeding and migration. Management of wetland impoundments for waterfowl production is often focused on water level drawdowns to influence vegetation. This study objective was to determine the effects of hydroperiod history and vegetative type on aquatic invertebrate diversity and biomass in managed flowages. In fall of 2016, invertebrates were sampled at Mead Wildlife Area in Milladore, Wisconsin, USA from four flowages with different drawdown years and in shallow areas of submersed, floating, and emergent vegetation. A two-way ANOVA revealed that diversity was influenced by drawdown year (p<0.001) but not by vegetation community (p=0.700). However, post-hoc analysis revealed no correlation between diversity and drawdown year, suggesting site-specific characteristics could be more influential than hydroperiod. Vegetation community (p=0.005) and drawdown year (p<0.001) significantly affected invertebrate biomass. The flowage with the earliest drawdown year had significantly higher biomass, and the samples with submersed and floating vegetation had the highest amount of biomass compared to the other communities. These results suggest that both hydroperiod and vegetation can influence invertebrate biomass, and vegetation may be a stronger driver in this waterfowl prey source.
- Wetland
- Management
- Food Webs
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Presenters/Authors
Kaira Kamke
(), RMB Environmental Laboratories, Inc., kaira.kamke@rmbel.info;
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