Journal article
Diet overlap among non-native trout species and native cutthroat Trout (Oncorhynchus clarkii) in two US ecoregions
ECOLOGY AND EVOLUTION, v 11(6), pp 2782-2795
Mar 2021
PMID: 33767836
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The invasion of freshwater ecosystems by non-native species can constitute a significant threat to native species and ecosystem health. Non-native trouts have long been stocked in areas where native trouts occur and have negatively impacted native trouts through predation, competition, and hybridization. This study encompassed two seasons of sampling efforts across two ecoregions of the western United States: The Great Basin in summer 2016 and the Yellowstone River Basin in summer 2017. We found significant dietary overlaps among native and non-native trouts within the Great Basin and Yellowstone River Basin ecoregions. Three orders of invertebrates (Ephemeroptera, Trichoptera, and Diptera) composed the majority of stomach contents and were responsible for driving the observed patterns. Great Basin trout had higher body conditions (k), and non-native Great Basin trout had higher gut fullness values than Yellowstone River Basin trout, indicating a possible limitation of food in the Yellowstone River Basin. Native fishes were the least abundant and had the lowest body condition in each ecoregion. These findings may indicate a negative impact on native trouts by non-native trouts. We recommend additional monitoring of native and non-native trout diets, regular invertebrate surveys to identify the availability of diet items, and reconsidering stocking efforts that can result in overlap of non-native fishes with native cutthroat trout.
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Details
- Title
- Diet overlap among non-native trout species and native cutthroat Trout (Oncorhynchus clarkii) in two US ecoregions
- Publication Details
- ECOLOGY AND EVOLUTION, v 11(6), pp 2782-2795
- Publisher
- WILEY; HOBOKEN
- Number of pages
- 13
- Grant note
- Division of Environmental Biology, Grant/Award Number: 1442595; Bundesministerium fur Bildung und Forschung, Grant/Award Number: 01LN1320A
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000615738300001
- Scopus ID
- 2-s2.0-85100470027
- Other Identifier
- 991021860757604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Ecology
- Evolutionary Biology