2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | AN INVESTIGATION OF SPATIAL HETEROGENEITY IN THE DISTRIBUTION OF AMPHIPODS IN PONDS | Virtual Platform
AN INVESTIGATION OF SPATIAL HETEROGENEITY IN THE DISTRIBUTION OF AMPHIPODS IN PONDS
We investigated whether amphipod abundance differs spatiotemporally within two adjacent ponds in east-central Minnesota. Amphipod abundance was estimated with benthic dipnet sweeps, conducted at ~9 sample points on five dates (Fall 2019). Within-pond abundance differed up to an order of magnitude among sample points. Abundance was more variable within a pond in September, but the variability and total amphipod counts declined linearly through October. Amphipod counts were maximized around 1.1-1.3m water depth and were not found in depths <0.6m. Amphipods were most abundant at sample sites with submersed aquatic vegetation but were also found at sites with decayed plants. We also found that the fishless pond had greater amphipod species richness and abundance than the one with fish (fishless: mean = 13 amphipods; with fish: mean = 3 amphipods), and amphipods were 32% larger in the fish-containing pond (fishless: mean = 9.0 mm and with fish: mean = 12.4 mm). Our results show that amphipod distributions may be partially explained by water depth, aquatic vegetation, fish presence, and sampling date. These factors should be considered when estimating amphipod abundance in ponds, for example, for waterfowl habitat restoration efforts.
- Detritivore
- Habitat
- Management
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Presenters/Authors
Ciashia Shiongyaj
(), Augsburg University, shiongyc@augsburg.edu;
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Danelle Larson
(), U.S. Geological Survey, dmlarson@usgs.gov ;
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Emily Schilling
(), Augsburg University, schillin@augsburg.edu;
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