none none FRESHWATER CRAYFISH: Upper Thermal Tolerances of Two Native and One Invasive Crayfish in Missouri, USA
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Freshwater Crayfish 28(1): 27-36 (2023)


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Upper Thermal Tolerances of Two Native and One Invasive Crayfish in Missouri, USA

Westhoff JT, Abdelrahman HA and Stoeckel JA  e-mail link

Published Online: 12/31/2023


The spread of invasive crayfish requires invaded habitats to be thermally suitable, and differences in thermal tolerances among species could provide thermal refugia for native crayfish affected by the invader. We estimated upper thermal tolerances for the invasive Faxonius hylas and native F. peruncus and F. quadruncus in Missouri, USA, using critical thermal maxima (CTmax) methodology to determine if there were ecologically exploitable differences in estimates among species and if areas within their distributional ranges exceed their thermal maximums. Estimates of CTmax did not differ among species or sexes but differed among groups acclimated to different temperatures. Additionally, crayfish size had a small, yet significant effect on CTmax estimates with smaller crayfish having lower CTmax estimates than larger crayfish. The similarity among CTmax estimates indicates that for at least upper thermal tolerance, areas thermally available to the native species will also be thermally suitable for the invader. We did not observe water temperatures in the field that exceeded CTmax estimates for any species. However, areas within the mainstem St. Francis River did have warming tolerance estimates of less than 5°C, indicating that establishment of the invader in the mainstem could be limited by water temperature.

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How to Cite

Westhoff JT, Abdelrahman HA and Stoeckel JA. (2023). Upper Thermal Tolerances of Two Native and One Invasive Crayfish in Missouri, USA. Freshwater Crayfish 28(1):27-36. doi: 10.5869/fc.2023.v28-1.27



Author Information

Jacob  Westhoff,* School of Natural Resources, US Geological Survey, Missouri Cooperative Fish and Wildlife Research Unit, 302 Anheuser Busch Natural Resources Building, Columbia, Missouri, United States65211. E-mail:

Hisham A. Abdelrahman, Department of Veterinary Hygiene and Management, Faculty of Veterinary Medicine, Cairo University, Cairo University, Giza, NA, Egypt12211. E-mail:

James A. Stoeckel, School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, 203 Swingle Hall, Auburn, AL, United States36849. E-mail:

Corresponding Author indicated by an *.


Publication History

   Manuscript Submitted: 5/17/2023

   Manuscript Accepted: 9/26/2023

   Published Online: 12/31/2023

   Published in Print: 12/31/2023



Funding Information

No specific funding statement is available for this article.






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