2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 3:15 PM - 3:30 PM | THRESHOLD RESPONSES OF TEMPERATE FISH COMMUNITIES TO WATERSHED LAND USE ACROSS THE WORLD | 151 DEF
THRESHOLD RESPONSES OF TEMPERATE FISH COMMUNITIES TO WATERSHED LAND USE ACROSS THE WORLD
Identifying threshold responses of communities to land-use change remains a key goal to understand the resilience of stream ecosystems and inform national-level environmental policies. However, testing for the existence of threshold responses has been limited to the watershed scale, and has rarely accounted for other confounding factors that may limit evidence for cause-and-effect associations. By collating data for >10,000 stream sites from across the world, we investigated for evidence of threshold responses of fish communities to urban and agriculture land-use. We found marked consistent in threshold responses of fish communities to watershed-level %urban land-use, ranging between 0-20%, spanning regions in North America, Europe and Australasia. By contrast, threshold responses of fish communities to %agriculture were much higher, ranging between 10-50%, and were more variably among continents. The shape of species threshold responses varied greatly and were largely nonlinear, often with thresholds indicative of step changes in fish compositions along land-use gradients. Species and community threshold responses to land-use change were found to be related to ecological and life-history traits. In conclusion, despite widely different biogeographic histories, our study found that fish communities responded similarly along a gradient of land-use change.
- Fish
- Watershed
- Assessment
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Presenters/Authors
Kai Chen
(), Nanjing Agricultural University, ckai2005@gmail.com;
ASHA DISCLOSURE:
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Julian Olden
(), University of Washington, olden@uw.edu;
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