2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/08/2017 | 9:30 AM - 9:45 AM | SHORT AND LONG-TERM IMPACTS OF SALMON CARCASS DECOMPOSITION ON STREAM MACROINVERTEBRATE AND MICROBIAL COMMUNITY STRUCTURE | 305B

SHORT AND LONG-TERM IMPACTS OF SALMON CARCASS DECOMPOSITION ON STREAM MACROINVERTEBRATE AND MICROBIAL COMMUNITY STRUCTURE

Salmon runs are an important annual input of organic matter into headwater streams. In Michigan, Pacific salmon (Oncorhynchus spp.) have been introduced into the Great Lakes for commercial and recreational fisheries. Once spawning occurs, the resulting carcasses may have novel effects on the aquatic communities residing in these naïve headwater streams. The objective was to determine the effects organic matter decomposition on aquatic macroinvertebrate and microbial communities over time using a salmon carrion introduction model. Macroinvertebrate and microbial communities (epilithic biofilm and internal macroinvertebrate guts) were sampled at both introduction (downstream reach) and reference sites (upstream reach) before (September), during (October), and after (November to August) carrion introduction. The study was repeated to assess inter-annual variation (September 2014-August 2016). Overall, macroinvertebrate species diversity was not affected by carcass introduction, but epilithic biofilm communities had higher microbial diversity and relative abundance of cyanobacteria in the introduction reach (PERMANOVA, p<0.001). These data suggest a potential cascading effect through the foodweb by exogenous salmon carrion microbial communities. These foundational data highlight the importance of carrion in the microbial ecology of lotic systems.

C11 Community Ecology
C03 Invertebrates
C04 Microbial Ecology

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Presenters/Authors

Courtney Larson (), Michigan State University, courtneyelarson126@gmail.com;