EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/22/2019  |   9:30 AM - 9:45 AM   |  EFFECTS OF CARCASS ADDITIONS ON STREAM FOOD WEBS ALONG A FISH ASSEMBLAGE GRADIENT IN AN INTERIOR COLUMBIA RIVER BASIN TRIBUTARY   |  250 CF

EFFECTS OF CARCASS ADDITIONS ON STREAM FOOD WEBS ALONG A FISH ASSEMBLAGE GRADIENT IN AN INTERIOR COLUMBIA RIVER BASIN TRIBUTARY

We added steelhead (Oncorhynchus mykiss) carcasses to three stream pairs in an interior Columbia River Basin tributary to evaluate how the reduction of marine derived nutrient (MDN) subsidies in this region may be impacting stream food webs. Juvenile salmonids were present in all three pairs (each with a control and treatment) but the proportion of native non-salmonids increased with distance downstream. Stable isotope analysis indicated that the majority of the food web – periphyton, various macroinvertebrate guilds, and non-salmonids – assimilated MDN through bottom-up pathways in the middle and downstream pair, but not the upstream pair. However, we estimated that most of these taxa only obtained 5-12% of their energy from MDN. In contrast, across the three study pairs, juvenile Chinook (O. tshawytscha) and steelhead obtained between 20-25% and 40-61% of their energy from MDN, respectively. Juvenile Chinook and steelhead growth rates and body condition were significantly greater in treatment reaches compared to controls 0-4 weeks after carcass additions. Diet analysis clearly indicated that salmonid MDN assimilation and enhanced growth were primarily attributed to direct consumption of carcass tissue and eggs. Diet analysis further revealed that non-salmonids did not consume eggs or carcass material.

  • Diet
  • Invertebrate
  • Food Webs

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Presenters/Authors

Matthew Kaylor (), Oregon State University, matthew.kaylor@oregonstate.edu;


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Seth White (), Columbia River Inter-Tribal Fish Commission, whis@critfc.org;


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Edwin Sedell (), Oregon Department of Fish and Wildlife, edwin.r.sedell@state.or.us;


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Ashley Sanders (), Oregon State University, a.sanders333@gmail.com;


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Dana Warren (), Oregon State University, dana.warren@oregonstate.edu;


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