Identity
Unique IDELEMENT_GLOBAL.2.102739
Element CodeAFCJC02100
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVertebrate Animal
IUCNLeast concern
Endemicoccurs (regularly, as a native taxon) in multiple nations
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 CommentsSee Clarkson and Minckley (1988) for information on hybridization between Catostomus insignis and C. clarkii in southeastern Arizona. See Smith (1992) for a study of the phylogeny and biogeography of the Catostomidae.
Conservation Status
Rank MethodExpertise without calculation
Review Date2011-10-26
Change Date2009-01-07
Edition Date2011-10-26
Edition AuthorsHammerson, G., and M. K. Clausen (2011)
Threat ImpactHigh
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences21 - 80
Rank ReasonsSmall range in streams in Arizona, New Mexico, and Sonora; has declined in some areas, apparently relatively common and stable in most of range; threats include water diversion, altered hydrology, and competition/predation from non-native fishes.
Range Extent CommentsRange includes the upper Gila River and Bill Williams River systems (Colorado River basin) in Arizona (Arizona Game and Fish Department 2002), Gila and San Francisco drainages (except extreme headwaters) in New Mexico (Sublette et al. 1990), and headwaters of the Santa Cruz and San Pedro rivers (Gila basin) in northern Sonora, Mexico (Miller 2005). The species is widely extirpated in the southern half of the range (Lee et al. 1980), possibly including the entire Santa Cruz River watershed (D. Foster, cited by Arizona Game and Fish Department 2002), although Miller (2005) cited a May 1988 collection in the Santa Cruz River in Sonora. Elevational range extends from about 300 meters to at least 2,663 meters (Arizona Game and Fish Department 2002).
Pyron (1999) estimated range size at 78,900 square kilometers, based on a generalized low-resolution map in Page and Burr (1991).
Occurrences CommentsThis species is represented by a large number of occurrences (subpopulations). Minckley and Marsh (2009) mapped well over 100 collection sites that were 1980 or later.
Turner and List (2007) determined that this species occurs in 56 streams in Arizona.
Sublette et al. (1990) mapped more than 50 post-1960 collection sites throughout the Gila and San Francisco drainages in New Mexico.
Miller (2005) mapped two locations in Sonora.
Threat Impact CommentsAlteration of historic flow regimes and construction of reservoirs have diminished available habitat, and general watershed erosion causing excessive sand deposition in streams has eliminated much of the required pool habitat (Arizona Game and Fish Department 2002). Minckley (1973 noted that this sucker seems intolerant of lake conditions, though the species sometimes has been captured in low numbers in reservoirs.
Rarity or absence in the Salt River Canyon is due mainly to predation by the flathead catfish, Pylodictis olivaris (see Arizona Game and Fish Department 1995).
A winter snagging season currently (1994) exists below Stewart Mountain Dam on the Lower Salt River. This management action was taken to encourage harvest, as many die during the extremely low winter water flows (Arizona Game and Fish Department 1995).
The species is regarded as very threatened in its small historical range in Sonora (A. Villarreal L., pers. comm., 1997).