Identity
Unique IDELEMENT_GLOBAL.2.102738
Element CodeAFCJC02090
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVertebrate Animal
IUCNLeast concern
Endemicendemic to a single state or province
KingdomAnimalia
PhylumCraniata
ClassActinopterygii
OrderCypriniformes
FamilyCatostomidae
GenusCatostomus
Concept ReferenceRobins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea, and W.B. Scott. 1991. Common and scientific names of fishes from the United States and Canada. American Fisheries Society, Special Publication 20. 183 pp.
Taxonomic CommentsThis species was fiirst diagnosed as a population of C. arenaris, which was subsequently merged with C. tahoensis, its closest relative. It was described as a distinct species by Miller (1973). The introduced population in the Santa Clara River hybridizes with C. (Pantosteus) santaanae (Lee et al. 1980, Moyle 2002).
See Smith (1992) for a study of the phylogeny and biogeography of the Catostomidae.
Conservation Status
Rank MethodLegacy Rank calculation - Excel v3.1x
Review Date2013-09-02
Change Date2013-09-02
Edition Date2013-09-02
Edition AuthorsHammerson, G.
Threat ImpactMedium - low
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank ReasonsSmall range in eastern California; abundant, widespread in native range; established introduced populations; likely relatively stable or slowly declining; most of population resides in reservoirs dominated by introduced game fishes, so periodic monitoring is needed.
Range Extent CommentsNative range includes the Owens River watershed in eastern California, where the species is most abundant in Crowley Reservoir (Mono County; reservoir formed by dam on Owens River) and widely distributed in the Owens River, Bishop Creek, and other streams in the Owens Valley (Moyle 2002). Range also includes Convict Lake (Mono County) and Lake Sabrina (Inyo County) (Moyle 2002). In the 1930s a population became established in the Santa Clara River in Los Angeles County via the Owens Aqueduct; apparently present in lower Sespe Creek, outflow of Fillmore Trout Hatchery, and Piru Creek and Reservoir (Swift et al. 1993, Moyle 2002). Another introduced population occurs in June Lake in the Mono Lake Basin (Moyle 2002).
Occurrences CommentsOccurrences have not been precisely circumscribed using standardized criteria, but this species appears to be represented by several distinct occurrences (subpopulations). It occurs in four USGS 8-digit Hydrological Units: Crowley Lake Watershed, Mono Lake Watershed, Owens Lake Watershed, Santa Clara Watershed (http://calfish.ucdavis.edu/species/?uid=60&ds=241).
Threat Impact CommentsThis species is ecologically flexible and has adapted to and thrives in reservoir habitat. However, a large part of the population depends on reservoirs dominated by introduced game fishes; this could pose a problem in the future.