2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 2:15 PM - 2:30 PM | RIPARIAN DEFOLIATION BY THE INVASIVE GREEN ALDER SAWFLY ALTERS TERRESTRIAL PREY SUBSIDIES TO SALMON STREAMS | 151 G
RIPARIAN DEFOLIATION BY THE INVASIVE GREEN ALDER SAWFLY ALTERS TERRESTRIAL PREY SUBSIDIES TO SALMON STREAMS
The green alder sawfly (Monsoma pulveratum) is an invasive wasp whose larvae are defoliating riparian thin-leaf alder (Alnus tenuifolia) stands across southcentral Alaska. To test the hypothesis that riparian defoliation by this invasive sawfly negatively affects the flow of terrestrial prey resources to stream fishes, we sampled terrestrial invertebrates on riparian alder foliage, their subsidies to streams, and their consumption by juvenile coho salmon (Oncorhynchus kisutch). Invasive sawflies altered the composition of terrestrial invertebrates on riparian alder foliage and as terrestrial prey subsidies to streams. Community analyses reinforced these findings revealing that invasive sawflies shifted the community structure of terrestrial invertebrates between seasons and levels of energy flow (riparian foliage, streams, and fish). Invasive sawfly biomass peaked mid-summer, altering the timing and magnitude of terrestrial prey subsidies to streams. Juvenile coho salmon consumed invasive sawflies when most abundant, but relied more on other prey types selecting against sawflies relative to their availability. Although we did not find effects of invasive sawflies extending to juvenile coho salmon in this study, these results could change as the distribution of invasive sawflies expands or as defoliation intensifies.
- Reciprocal Subsidies
- Food Webs
- Riparian
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Presenters/Authors
David Roon
(), Oregon State University, david.roon@oregonstate.edu;
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Mark Wipfli
(), University of Alaska Fairbanks, mwipfli@alaska.edu;
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Jim Kruse
(), US Forest Service, jkruse@fs.fed.us;
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