2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 2:00 PM - 2:15 PM | MERGING ECOSYSTEM AND FOOD-WEB UNDERSTANDING OF THE CONSEQUENCES OF TERRESTRIAL SUBSIDIES IN A FORESTED STREAM | 301A

MERGING ECOSYSTEM AND FOOD-WEB UNDERSTANDING OF THE CONSEQUENCES OF TERRESTRIAL SUBSIDIES IN A FORESTED STREAM

We combined estimates of secondary production of fishes, their diets, and bioenergetic efficiencies to estimate the contribution of aquatic vs. terrestrial prey to the trophic basis of production of 5 fishes in a Hokkaido stream. We found that 27-62% of total annual fish production was based on terrestrial prey, with terrestrial contributions to 3 dominant salmonid species all >56%. Organic matter fluxes to fish production totaled 8.79 g AFDM m^-2 y^-1 from terrestrial prey and 7.13 g AFDM m^-2 y^-1 from aquatic prey. Fish consumed 66% of the flux of terrestrial prey to fuel their production, and organic matter flows to fishes peaked in late summer when terrestrial prey input peaked, and when previous experiments have demonstrated positive indirect effects of terrestrial prey subsidies on aquatic invertebrates. Yet, at annual time scales fish consumed >80% of total aquatic invertebrate production, suggesting a nonlinear and dynamic fish-invertebrate interaction, and neutral or negative indirect effects of terrestrial subsidies on aquatic invertebrates. Combining ecosystem and food web perspectives may change our understanding of the indirect effects of prey subsidies across time scales.

C25 Food Webs
C11 Community Ecology
C28 Land-Water Interfaces

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Presenters/Authors

Amy Marcarelli (), Michigan Technological University, ammarcar@mtu.edu;