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

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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6/08/2017 | 12:15 PM - 12:30 PM | LIFE ON THE EDGE: DOES FISH MOVEMENT AMONG HABITATS LINK GREAT LAKES COASTAL WETLAND AND NEARSHORE FOOD WEBS? | 306B

LIFE ON THE EDGE: DOES FISH MOVEMENT AMONG HABITATS LINK GREAT LAKES COASTAL WETLAND AND NEARSHORE FOOD WEBS?

Coastal wetlands of the Laurentian Great Lakes are highly productive ecosystems at the terrestrial-aquatic boundary that support diverse biological communities and provide habitat for 90% of Great Lakes fishes. Nearshore habitats are linked to coastal wetlands by the exchange of materials (e.g., organisms, nutrients, organic matter) through both abiotic and biotic mechanisms. Wetland use by native sport fishes represents a potentially vital linkage that provides energy for economically important coastal fisheries. Using Lake Michigan yellow perch (Perca flavescens) as a model, we investigated use of both coastal wetland and nearshore lake habitats using carbon and nitrogen stable isotopes and otolith microchemistry. Coastal wetland prey are significantly depleted in 13C relative to the nearshore, allowing us to use mixing models to estimate wetland-derived resource use. Perch otolith strontium and barium age signatures suggest intra-population variation in habitat use across life stages. Quantifying the importance of coastal wetlands in supporting recreational fisheries will allow managers to prioritize the conservation and restoration of these areas, many of which have been degraded as a result of land use conversion, invasive species, and pollution.

S16 Understanding and mitigating change in freshwater ecosystem services
C25 Food Webs
C25 Food Webs

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Presenters/Authors

Katherine O'Reilly (), Department of Biological Sciences, University of Notre Dame, koreill2@nd.edu;