2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/23/2018 | 9:30 AM - 9:45 AM | RESPONSE OF ARID RIVER FISHES TO CLIMATE, HYDROLOGY AND WILDFIRE | 320

RESPONSE OF ARID RIVER FISHES TO CLIMATE, HYDROLOGY AND WILDFIRE

Arid regions of the American southwest have experienced increasing severity of drought associated with decreased stream discharge and increased frequency and intensity of wildfires. Combined, these factors, particularly ash flows following wildfires, can have devastating effects on stream fish communities. Long-term data indicated fish species richness and density declined with drought and wildfire, but overall, native species were more responsive to inter-annual variation in climate than nonnative fishes. The resistance and resilience of fishes to and extreme drought and ash flows following wildfire was highly variable across nine sites and different species. Five years after the disturbance, all but two species had recovered across the intensively sampled sites. The ability of species to resist disturbance was hypothesized to vary with body size and species provenance (native or nonnative), but this was not supported by the data. Our results show that resistance of fish communities appears to be driven primarily by spatial factors such as the intensity of disturbance, whereas recovery is driven by both species ability to recover from small populations or immigrate from a nearby refuge population.

Fish
Disturbance
Conservation

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Presenters/Authors

Keith Gido (), Kansas State University, kgido@ksu.edu;