2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
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
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Christopher Cheek
(), Purdue University, cheekc@purdue.ediu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Brandon K. Peoples
(), Clemson University, peoples@clemson.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Reuben Goforth
(), Purdue University, rgoforth@purdue.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -