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Life history of the endemic saddleback crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA
DiStefano RJ, Westhoff JT, Rice CJ and Rosenberger AE 
Published Online: 2/22/2019
Abstract
The saddleback crayfish, Faxonius medius (Faxon, 1884), is endemic to a single drainage in eastern Missouri, USA, that is affected by heavy metals mining, and adjacent to a rapidly-expanding urban area. We studied populations of F. medius in two small streams for 18 months to describe the annual reproductive cycle and gather information about fecundity, sex ratio, size at maturity, and size-class structure. We also obtained information about the species’ density at supplemental sites. The species, though rare in a geographic context, is locally abundant; we captured a monthly average of more than 75 F. medius from each of the two study populations. Densities of F. medius were high relative to several sympatric species of Faxonius Cope, 1872 and Cambarus Erichson, 1846. The species exhibited traits of an r-strategist life history; it was relatively short-lived and early to maturity. Its fecundity and egg size were comparable to Ozark congeners. Breeding season occurred in autumn, perhaps extending into early winter. Egg brooding occurred primarily in April. Young-of-year first appeared in samples in June. We estimated that these populations contained 2 to 3 size-classes, and most individuals became sexually mature in their first year of life. Life history information presented herein will be important for future conservation efforts.
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How to Cite
DiStefano RJ, Westhoff JT, Rice CJ and Rosenberger AE. (2019). Life history of the endemic saddleback crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA. Freshwater Crayfish 24(1):1-13. doi: 10.5869/fc.2019.v24-1.1
Author Information
Robert J. DiStefano,* Resource Science Division, Missouri Department of Conservation, 3500 East Gans Road, Columbia, Missouri, USA65201. E-mail: Bob.DiStefano@mdc.mo.gov
Jacob T. Westhoff, Resource Science Division, Missouri Department of Conservation, 3500 East Gans Road, Columbia, Missouri, USA65201. E-mail: Jacob.Westhoff@mdc.mo.gov
Christopher J. Rice, Resource Science Division, Missouri Department of Conservation, 3500 East Gans Road, Columbia, Missouri, USA65201. E-mail: Christopher.Rice@mdc.mo.gov
Amanda E. Rosenberger, Tennessee Cooperative Fishery Research Unit, U.S. Geological Survey, Tennessee Tech Univeristy, Box 5114, Cookeville, Tennessee, USA38505. E-mail: arosenberger@tntech.edu
Corresponding Author indicated by an *.
Publication History
Manuscript Submitted: 9/21/2018
Manuscript Accepted: 1/22/2019
Published Online: 2/22/2019
Published in Print: 2/28/2019
Funding Information
No specific funding statement is available for this article.