EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/27/2021 | 2:00 PM - 3:30 PM | EXPLORING NEARSHORE FISH FOOD WEBS AND NICHE SPACE PATTERNS USING STABLE ISOTOPES | Virtual Platform
EXPLORING NEARSHORE FISH FOOD WEBS AND NICHE SPACE PATTERNS USING STABLE ISOTOPES
Small nearshore fishes are an important part of lacustrine and functional diversity and link pelagic and benthic habitats by serving as prey to larger nearshore and offshore fish. However, the trophic complexity of these small nearshore fish communities is often unrecognized and detailed studies of their food webs are often lacking or focus on larger predator or game fish. Here, we examined niche space patterns of small nearshore fish species using Bayesian analyses of carbon and nitrogen stable isotope data in nine Minnesota lakes. We found considerable intraspecific variability in fish niche areas among lakes and high variability in niche overlap across species. At the assemblage level, niche overlap decreased as whole-lake species richness increased, possibly indicating a greater degree of resource specialization in more speciose lakes. Overall fish niche space was weakly related to niche space of their invertebrate prey. Although nearshore benthic resources contributed to fish diets in all lakes, all fish species also had non-negligible and variable contributions from pelagic zooplankton. This inter- and intraspecific variability in trophic niche space likely contributes to the multi-level trophic complexity, functional diversity, and potentially food web resilience to ecosystem changes.
- Species interactions
- Vertebrates
- Biological interactions
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Presenters/Authors
Holly Wellard Kelly
(), University of Minnesota-Duluth NRRI, hwellard@d.umn.edu;
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Katya Kovalenko
(), Natural Resources Research Institute, Univ. Minnesota Duluth, philarctus@gmail.com;
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Tyler Ahrenstorff
(), Minnesota Department of Natural Resources, tyler.ahrenstorff@state.mn.us;
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Bethany Bethke
(), Minnesota Department of Natural Resources, bethany.bethke@state.mn.us;
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Valerie Brady
(), Natural Resources Research Institute, University Minnesota Duluth, vbrady@d.umn.edu;
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Josh Dumke
(), Natural Resources Research Institute, University of Minnesota, jddumke@d.umn.edu;
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Gretchen Hansen
(), University of Minnesota, ghansen@umn.edu;
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Heidi Rantala
(), Minnesota Department of Natural Resources, heidi.rantala@state.mn.us;
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