2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/27/2021 | 2:00 PM - 3:30 PM | Mechanisms behind crayfish species replacements: competition between a nonnative and an imperiled crayfish | Virtual Platform

Mechanisms behind crayfish species replacements: competition between a nonnative and an imperiled crayfish

Freshwater crayfish are one of the most imperiled taxonomic groups in North America, and nonnative crayfish pose a major threat to native crayfishes. Many crayfish have limited distributions, so merely moving crayfish between adjacent drainages can cause species replacements that threaten native species. Here, we investigate the mechanism behind one of these replacements to inform the conservation of an imperiled crayfish. Specifically, we examine competitive interactions between the imperiled Black Creek crayfish (BCC; Procambarus pictus), which is endemic to the lower St. Johns River drainage, Florida, and the white tubercled crayfish (WTC; P. spiculifer), an introduced species from a neighboring drainage. Changes in the distribution of these species over the past decade suggest that WTC is replacing BCC throughout much of its range. We are conducting laboratory experiments to examine aggressive interactions between these species and their relative competitive ability for shelter and food resources. Preliminary results suggest that BCC outcompete WTC when size matched, but WTC are larger in the stream system. We are currently conducting competition experiments with sizes that reflect those in the field and hypothesize that WTC will be the superior competitor in these experiments.

Stream
Biological effects
Stressor

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Presenters/Authors

Nicole Tripp (), University of Florida, tripp17@ufl.edu;