2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 9:15 AM - 9:30 AM | DISTRIBUTION, HABITAT ASSOCIATONS, AND CONSERVATION STATUS UPDATES FOR TWO CRAYFISHES ENDEMIC TO THE WESTERN UNITED STATES | 253 AB
DISTRIBUTION, HABITAT ASSOCIATONS, AND CONSERVATION STATUS UPDATES FOR TWO CRAYFISHES ENDEMIC TO THE WESTERN UNITED STATES
Our study evaluates the distribution, habitat associations, and current conservation status of the pilose crayfishes Pacifastacus connectens and Pacifastacus gambelii, two data-deficient species endemic to the western United States. We first developed a species distribution model for the pilose crayfishes based on their historic occurrence records, then sampled 163 sites in the summers of 2016 and 2017 within the distribution of these crayfishes, including 50 where these species were observed historically. Our SDM predicted 73 sites (45%) we sampled as suitable for the pilose crayfishes, with a moderate AUC value of 0.824. We found the pilose crayfishes at only 20 (12%) of the 163 total sites we sampled, 14 (20%) of the 73 sites predicted as suitable for them by our SDM, and 12 (24%) of 50 historical sites that we sampled. We found that the pilose crayfishes have seemingly experienced substantial range declines, attributable to apparent displacement by invasive crayfishes and impairment or change to stream communities and habitat. We recommend increased conservation and management attention to P. connectens and P. gambelii in response to these findings.
- Invasives
- Invertebrate
- Distribution
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Presenters/Authors
Rachel Egly
(), Loyola University Chicago, regly@luc.edu;
ASHA DISCLOSURE:
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Eric Larson
(), University of Illinois, erlarson@illinois.edu;
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