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Effects of Non-native Brown Trout and Temperature on the Production of Rio Grande Cutthroat Trout Populations

Metadata Updated: June 15, 2024

Native Cutthroat Trout Oncorhynchus clarkii spp. populations in the western U.S. have declined in part due to displacement by nonnative trout, but mechanisms to explain displacement vary by species and geography. Using a production framework, we demonstrated allopatric populations of Rio Grande Cutthroat Trout O. c. virginalis (RGCT) exhibited consistently higher biomass and secondary production rates (0.19–0.92 g DM·m-2·yr-1) than sympatric populations with Brown Trout Salmo trutta (0.01–0.05 g DM·m-2·yr-1) and that an interactive temperature effect on RGCT biomass and production was overshadowed by the presence of Brown Trout across cold and warm streams. Interestingly, over half of trout production was fueled by a small group of taxa including Trichoptera (caddisfly) nymphs and Hymenoptera (ants, wasps, and bees), which were actively selected by both trout species. Similar prey preferences and niche widths suggest that RGCT are experiencing competitive exclusion by Brown Trout. These results offer fresh insight into the unique environmental conditions of headwater streams in the Southwest and justify management strategies to segregate Cutthroat Trout and nonnative trout species.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date June 15, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date June 15, 2024
Publisher Climate Adaptation Science Centers
Identifier 8a05c06d-bdef-4caa-87a2-a7a7d9d5dfed
Data Last Modified 2020-05-19
Category geospatial
Public Access Level public
Bureau Code 010:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id daf5bd50-4fbe-4dd8-8656-0bbfe7ccc789
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -107.666,34.7055,-105.3369,37.0552
Source Datajson Identifier True
Source Hash 5f02ad2c9ae46e2e2443f65d4067db6744e750b3bd317da41f598880141174ea
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -107.666, 34.7055, -107.666, 37.0552, -105.3369, 37.0552, -105.3369, 34.7055, -107.666, 34.7055}

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