EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 9:30 AM - 9:45 AM | DO RESOURCE SUBSIDIES FROM INVASIVE RIPARIAN TREES FACILITATE NON-NATIVE FISH IN THE UPPER COLORADO RIVER BASIN? | 251 DE
DO RESOURCE SUBSIDIES FROM INVASIVE RIPARIAN TREES FACILITATE NON-NATIVE FISH IN THE UPPER COLORADO RIVER BASIN?
Species invasion can disrupt linkages between terrestrial and aquatic ecosystems by altering timing and magnitude of cross-ecosystem subsidies. Novel subsidies, or subsidies from non-native species, may disproportionately benefit invasive consumers in recipient ecosystems. Here we test the hypothesis that resource subsidies from an invasive Russian olive tree (Elaganus agustafolia) directly facilitate non-native channel catfish (Ictalurus punctatus) in the San Juan River (NM/UT, USA). Large fluxes of carbohydrate-rich olives drop into the river in late summer and autumn and are heavily consumed (up to 80% of diet seasonally) by catfish but not native fishes. Bioenergetic modeling and experimental trials suggest that olives contribute little to catfish growth and lipid accumulation but may provide metabolic energy. We conclude that olives likely provide an energy subsidy to catfish that may be particularly important during periods of low prey availability and high metabolic demand. Consumption of RO fruit may decrease predation pressure on native fishes and alleviate competition for other food resources. Our results illustrate how riparian invasions may facilitate aquatic consumers through cross-ecosystem subsidies.
- Subsidy
- Diet
- Fish
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Presenters/Authors
Christopher Cheek
(), Purdue University, cheekc@purdue.ediu;
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Brandon K. Peoples
(), Clemson University, peoples@clemson.edu;
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Reuben Goforth
(), Purdue University, rgoforth@purdue.edu;
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