Moxostoma congestum 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Catostomidae

Scientific Name: Moxostoma congestum (Baird & Girard, 1854)
Common Name(s):
English Gray Redhorse, Grey Redhorse
Catostomus congestus Baird & Girard, 1854
Scartomyzon congestus ssp. congestus (Baird & Girard, 1854)

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2013
Date Assessed: 2012-03-01
Assessor(s): NatureServe
Reviewer(s): Smith, K. & Darwall, W.R.T.
Facilitator/Compiler(s): Hammerson, G.A. & Ormes, M.
This species has a small range (mostly in Texas); reduced range and abundance, and is locally declining. Fragmentation (e.g., dams), stream dewatering, and contaminants probably contributed to a deteriorated status in New Mexico. It is currently relatively stable overall, so listed as Least Concern.
Previously published Red List assessments:

Geographic Range [top]

Range Description:The range includes the Brazos River drainage west to the Pecos River system of Rio Grande drainage, Texas and southeastern New Mexico, and the Rio Grande in the vicinity of El Paso, Texas; largely in the Edwards Plateau region and its escarpments (Lee et al. 1980). In New Mexico, this species is now found only downstream of Brantley Dam in the lower Pecos River and in the Black River (see New Mexico Department of Game and Fish 1996). Populations in Mexico, formerly included in Moxostoma congestum, are now assigned to Moxostoma albidum; it is uncertain whether M. congestum occurs in Mexico (Nelson et al. 2004).
Countries occurrence:
United States
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is represented by a large number of subpopulations and locations.

Although collected regularly in New Mexico, it is not common in any area (see New Mexico Department of Game and Fish 1996).

In New Mexico, formerly widespread and now declining (Sublette et al. 1990); currently extirpated in the Rio Grande and diminishing in the Pecos River drainage; occurs in numbers only in the Black River (Eddy County) and the Pecos River immediately downstream of Lake McMillan (see New Mexico Department of Game and Fish 1996).

Currently stable in Texas.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Warm, clear to moderately turbid, sluggish, low gradient, small to medium rivers. Adults typically occur in pools over rock, gravel, sand, and silt; sometimes in deep runs. Juveniles and young often in riffles and gravelly runs, avoid densely vegetated areas. Occurs also in a few Texas lakes. Spawns in tail of pools just above riffles over clean cobble-gravel-pebble bottoms in water about 0.3-0.6 m deep (Sublette et al. 1990).
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): No specific information is available on factors that have reduced range and abundance, but fragmentation (e.g., dams), stream dewatering, and contaminants probably contributed to a deteriorated status in New Mexico (see New Mexico Department of Game and Fish 1996).

Conservation Actions [top]

Conservation Actions:

Additional information on habitat threats, ecological fragility, population status, and abundance is needed. Protection of stream quality is important.

Citation: NatureServe. 2013. Moxostoma congestum. The IUCN Red List of Threatened Species 2013: e.T13915A18232508. . Downloaded on 21 September 2018.
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