2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 10:00 AM - 10:15 AM | SPATIAL HETEROGENEITY IN BIOMASS TURNOVER AND ENERGY-FLOW ACROSS A FLOODPLAIN FOODWEB MOSAIC | 250 DE
SPATIAL HETEROGENEITY IN BIOMASS TURNOVER AND ENERGY-FLOW ACROSS A FLOODPLAIN FOODWEB MOSAIC
The trophic basis of production and quantitative flow food web approaches hold potential to confront food web theory, and one under-realized possibility lies in using biomass turnover rates (P:B ratios) to examine characteristics of energy flow through freshwater meta-food webs. Recent studies illustrate that connections among spatially distinct sub-webs couple energy channels which differ in rates of energy flux due to differences in biomass turnover rates, and such coupling is predicted to confer stability to meta-food webs. However, these ideas have seen little empirically evaluation. In a spatially complex river-floodplain of the Methow River, WA, we found that biomass turnover rates of invertebrate and fish assemblages varied among sub-webs among habitat patches, and that biomass turnover and energy flow increased across a gradient of off-channel habitats as hydrologic connectivity with the main channel decreased. Because movements of materials and organisms connect these habitats and their distinct process rates, such a spatial arrangement of sub-webs may contribute to maintenance of biodiversity. These findings may improve our understanding of meta-foodweb architecture and dynamics in the shifting habitat mosaic of river-floodplains, and guide future investigation of heterogeneity in energy flow across landscapes.
- Floodplain
- Landscape
- Spatial
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Presenters/Authors
James Paris
(), Stream Ecology Center, Dept. Biological Sciences, Idaho State University, parijame@isu.edu;
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Colden Baxter
(), Idaho State University, baxtcold@isu.edu;
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J. Ryan Bellmore
(), Forest Service, Pacific Northwest Research Station, Juneau, AK, jbellmore@fs.fed.us;
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