Life history of the endemic saddleback crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA
Freshwater Crayfish
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
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.
Suggested Citation
DiStefano, R., Westhoff, J., Rice, C., Rosenberger, A.E., 2019, Life history of the endemic saddleback crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA: Freshwater Crayfish, v. 24, no. 1, p. 1-13, https://doi.org/10.5869/fc.2019.v24-1.1.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Life history of the endemic saddleback crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA |
| Series title | Freshwater Crayfish |
| DOI | 10.5869/fc.2019.v24-1.1 |
| Volume | 24 |
| Issue | 1 |
| Publication Date | February 22, 2019 |
| Year Published | 2019 |
| Language | English |
| Publisher | International association of Astacology |
| Contributing office(s) | Coop Res Unit Atlanta |
| Description | 13 p. |
| First page | 1 |
| Last page | 13 |
| Country | United States |
| State | Missouri |