Choosing source populations for conservation reintroductions: lessons from variation in thermal tolerance among populations of the imperilled redside dace1

Author:

Turko Andy J.12,Leclair Alexandra T.A.34,Mandrak Nicholas E.34,Drake D. Andrew R.5,Scott Graham R.1,Pitcher Trevor E.67

Affiliation:

1. Department of Biology, McMaster University, Hamilton, ON L8S 4L8, Canada.

2. Department of Psychology, Neuroscience, and Behaviour, McMaster University, Hamilton, ON L8S 4L8, Canada.

3. Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S 3B2, Canada.

4. Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4, Canada.

5. Great Lakes Laboratory for Fisheries and Aquatic Sciences, Fisheries and Oceans Canada, Burlington, ON L7S 1A1, Canada.

6. Department of Integrative Biology, University of Windsor, Windsor, ON N9B 3P4, Canada.

7. Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON N9C 1A2, Canada.

Abstract

Reintroduction is an increasingly common conservation tool used to recover populations of imperilled species, but its success depends on the suitability of the introduced animals’ phenotype for their new habitat. For fishes, thermal tolerance may be a key trait in urbanized habitats. We compared thermal tolerance (CTmax) among three lineages (western, central, eastern) of imperilled redside dace (Clinostomus elongatus). CTmax of eastern adults was 3–4 °C lower than that of the other lineages, but adults of each lineage had similar thermal acclimation responses. In contrast, the acclimation response of juveniles differed by ∼80% between the central and western lineages. Using these data, we predicted how each lineage would fare in a hypothetical reintroduction to relatively warm urbanized habitats. Owing to the differences in juvenile acclimation responses, predicted thermal safety margins for the central lineage were double those predicted for the western lineage. Overall, we suggest that CTmax is a useful trait to incorporate into the source population selection process; however, there is an urgent need for the establishment of captive experimental research populations of imperilled species to address remaining uncertainties.

Publisher

Canadian Science Publishing

Subject

Aquatic Science,Ecology, Evolution, Behavior and Systematics

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