2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 3:00 PM - 3:15 PM | UNTANGLING EFFECTS OF PREDATORS AND LANDSCAPE FACTORS AS DRIVERS OF STREAM FISH COMMUNITY STRUCTURE | 151 DEF
UNTANGLING EFFECTS OF PREDATORS AND LANDSCAPE FACTORS AS DRIVERS OF STREAM FISH COMMUNITY STRUCTURE
Predators strongly effect stream fish at fine spatial scales, but it is unclear how these responses scale up to influence stream fish communities at broad spatial scales. Because predators and prey respond to environmental variability, measuring responses to predators requires untangling the effects of abiotic factors on both predators and prey. We collected fish community data in the summers of 2017 and 2018 and used a hierarchical modeling approach paired with structural equation modeling to determine how factors measured at the watershed and reach spatial scales influence the distribution of a predatory fish, Largemouth Bass (Micropterus salmoides). We then compared how fish species richness and community composition responded to the presence of bass mediated by environmental factors. Bass probability of occurrence increased with catchment area, while richness responded to abiotic variation at multiple scales. Richness was higher at sites with bass, but fish community composition did not exhibit strong responses to the presence of bass. As both stream habitats and predation pressure continue to change globally, it is necessary to understand the effects of predators and environmental variation as drivers of community structure to inform management of stream biota.
- Intermittency
- Fish
- Disturbance
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Presenters/Authors
Lindsey Bruckerhoff
(), Kansas State University, lbrucke@ksu.edu;
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Keith Gido
(), Kansas State University, kgido@ksu.edu;
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Michael Estey
(), US Fish and Wildlife Service, mike_estey@fws.gov;
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Pamela Moore
(), US Fish and Wildlife Service, pamela_j_moore@fws.gov;
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