2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2019 | 9:45 AM - 10:00 AM | THE ENVIRONMENTAL NICHE OF TWO IMPERILED STREAM ECOSYSTEM ENGINEERS: HORNYHEAD CHUB (NOCOMIS BIGUTTATUS) AND REDSPOT CHUB (NOCOMIS ASPER) | 250 CF
THE ENVIRONMENTAL NICHE OF TWO IMPERILED STREAM ECOSYSTEM ENGINEERS: HORNYHEAD CHUB (NOCOMIS BIGUTTATUS) AND REDSPOT CHUB (NOCOMIS ASPER)
The Hornyhead Chub (Nocomis biguttatus) and Redspot Chub (Nocomis asper) are mound-building spawners. Several other fish species use chub mounds as spawning habitat, thus making chubs ecosystem engineers. Both chubs are threatened in Kansas because of population declines, which could also contribute to lower spawning success of several imperiled mound-spawning associates. We sought to describe the environmental niche of Kansas Nocomis to identify factors limiting their distribution. We addressed our objective by examining co-occurrences between chubs and other fishes (correlation and non-metric multidimensional scaling), comparing physicochemical variables between sites where chub were present versus absent (analysis of deviance), and by constructing environmental niche models (generalized linear model). Hornyhead Chub exhibited positive co-occurrences with Carmine and Sand Shiners, while Redspot Chub were positively associated with Ozark Minnow and Cardinal Shiner. Furthermore, streams where chub were present had clearer water, less silt, and less upstream watershed area as agricultural or reservoir habitat compared to sites where absent. Potential repatriation streams should possess these environmental characteristics, and stream management should strive to preserve or restore these conditions to recover chub populations.
- Conservation
- Modeling
- Watershed
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Presenters/Authors
James Whitney
(), Pittsburg State University, jewhitney@pittstate.edu;
ASHA DISCLOSURE:
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Joshua Holloway
(), Pittsburg State University, jholloway@gus.pittstate.edu;
ASHA DISCLOSURE:
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Nonfinancial -