2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | Effects of non-native Brown trout (Salmo trutta) on the growth and production of native stream fishes in New Mexico | Virtual Platform
Effects of non-native Brown trout (Salmo trutta) on the growth and production of native stream fishes in New Mexico
Brown trout (Salmo trutta) are non-native to the Middle Rio Grande basin, New Mexico. Presently, these invaders overlap with multiple native fishes of conservation concern including Rio Grande sucker (Catostomus plebeius) and Rio Grande chub (Gila pandora). Despite concerns about the negative effects of these non-native salmonids, there remains limited data describing how Brown trout affect these native fishes. Specifically, Brown trout may compete for food resources with native fishes, thereby reducing growth and secondary production. We conducted a 3-month field study to assess the daily growth rates and secondary production of fishes in six streams within the Jemez River watershed. We found the daily growth rates of each species were inversely related to total fish density, indicating patterns of density-dependent growth. In streams with high Brown trout production, we observed lower production in Rio Grande sucker and Rio Grande chub in mainstem and tributary sites. One tributary went intermittent, resulting in negative growth and production in all species. Findings indicate that Brown trout are reducing secondary production of native fish populations.
- Conservation
- Food webs
- Ecosystem functioning
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Presenters/Authors
Owen George
(), Texas Tech University, owen.george78@gmail.com;
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Scott Collins
(), Texas Tech University, Scott.Collins@ttu.edu;
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