2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/27/2021 | 2:00 PM - 3:30 PM | Stream invertebrate response to Pacific salmon recolonization of the Cedar River, WA above Landsburg Dam after the restoration of fish passage | Virtual Platform
Stream invertebrate response to Pacific salmon recolonization of the Cedar River, WA above Landsburg Dam after the restoration of fish passage
Stream ecosystems are important for the rearing of juvenile salmon, and there is potential for cascading effects as food webs undergo changes, as determined by the interplay between dynamic processes of bottom-up and top-down control. On the Cedar River in Washington, construction of the Landsburg Dam in 1903 caused a local extinction of anadromous Pacific salmon (Oncorhynchus spp.) above the dam until 2003, when managers added a fish passage, allowing for the volitional recolonization of 33 km of high-quality habitat. We analyzed invertebrate drift and benthic periphyton data spanning before, during, and after Pacific salmon recolonization (2000-2016). From this years-long study, we estimate biomass at different trophic levels to examine the relative importance of top-down and bottom-up trophic effects on the stream ecosystem. Anadromous Pacific salmon are an important source of energy and nutrients for oligotrophic rivers of the Pacific Northwest; we expect to see a bottom-up effect from carcass nutrient subsidies (fertilization effect), leading to an overall increase in periphyton and invertebrate biomass. We may also see bottom-down effects from increased invertebrate grazing and competitive interactions between juvenile salmon and resident trout species.
- Energy flows
- Monitoring
- Biological effects
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Presenters/Authors
Peter Kiffney
(), Northwest Fisheries Science Center, peter.kiffney@noaa.gov;
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Vail Dark
(), NOAA, vail.dark@noaa.gov;
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Peter Aronson
(), NOAA, peter.aronson@noaa.gov;
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