Cyprinella venusta

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	ACTINOPTERYGII	CYPRINIFORMES	CYPRINIDAE

Scientific Name:

Cyprinella venusta

Species Authority:

Girard, 1856

Common Name/s:

English

–

Blacktail Shiner

Taxonomic Notes:

Kristmundsdottir and Gold (1996) used mtDNA restriction site analysis to study systematics and biogeography and identified four major mtDNA-based phylogeographic clades: Chocktawatchee, Apalachicola, Mobile, and Western (four lineages, Texas to Mississippi). They found that mtDNA phylogeographic subdivision within C. venusta is not strictly concordant with geographic subdivisions (ranges) of the three nominal subspecies (venusta, cercostigma, and stigmatura). Taxonomic revision may be warranted, but further study is needed. This species was removed from the genus Notropis and placed in the genus (formerly subgenus) Cyprinella by Mayden (1989). This change was adopted in the 1991 AFS checklist (Robins et al. 1991). See Mayden (1989) for synonymy.

Assessment Information [top]

Red List Category & Criteria:	Least Concern ver 3.1
Year Published:	2010
Assessor/s:	NatureServe (G. Hammerson)
Reviewer/s:	Shaefer, J. (Freshwater Fish Red List Authority), Collen, B., Richman, N. & Ram, M. (Sampled Red List Index Coordinating Team)
Contributor/s:
Justification: Cyprinella venusta has been assessed as Least Concern due to its large distribution and abundance throughout its range. At present no major threat processes for this species are known, and so is not thought to be threatened.

Geographic Range [top]

Range Description:	The range of Cyprinella venusta extends from the Rio Grande basin in Texas to the Suwannee River drainage in Florida and Georgia, north to the Mississippi River basin, to southern Oklahoma, southeastern Missouri, southern Illinois, and western and southern Tennessee (Lee et al. 1980). The area in which this species is distributed is approximately 141,865 km².
Countries:	Native: United States (Alabama, Arkansas, Florida, Georgia, Illinois, Louisiana, Missouri, Oklahoma, Tennessee)
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population:	Cyprinella venusta is represented by a very large number of subpopulations (e.g. see map in Lee et al. 1980). It is one of the most ubiquitous minnows in drainages along the northern gulf coast (Lee et al. 1980; Boschung and Mayden 2004; Ross 2001). The adult population size is unknown, but likely exceeds 1,000,000 individuals. Extent of occurence, area of occupancy, number of subpopulations, and population size are thought to be relatively stable or declining at a rate of less than 10% over 10 years or three generations.
Population Trend:	Stable

Population:

Cyprinella venusta is represented by a very large number of subpopulations (e.g. see map in Lee et al. 1980). It is one of the most ubiquitous minnows in drainages along the northern gulf coast (Lee et al. 1980; Boschung and Mayden 2004; Ross 2001).

The adult population size is unknown, but likely exceeds 1,000,000 individuals.

Extent of occurence, area of occupancy, number of subpopulations, and population size are thought to be relatively stable or declining at a rate of less than 10% over 10 years or three generations.

Population Trend:

Stable

Habitat and Ecology [top]

Habitat and Ecology:	Cyprinella venusta is most commonly found in pools and runs of clear, sandy-bottomed, small to medium rivers, in areas of sparse vegetation and a strong current. Upland populations occur in creeks over more gravel/ rubble substrate (Lee et al. 1980; Page and Burr 1991). Populations in the western part of the this species range are often found in turbid water. This species eggs are spawned into crevices. Recent studies indicate that this species is able to outcompete C. lutrensis, especially in areas below reservoirs (Matthews and Marsh-Matthews 2007). Suttkus and Mette (2009) noted the complete extirpation of C. lutrensis from the Sabine River below a reservoir, where C. venusta numbers are stable or increasing.
Systems:	Freshwater

Habitat and Ecology:

Cyprinella venusta is most commonly found in pools and runs of clear, sandy-bottomed, small to medium rivers, in areas of sparse vegetation and a strong current. Upland populations occur in creeks over more gravel/ rubble substrate (Lee et al. 1980; Page and Burr 1991). Populations in the western part of the this species range are often found in turbid water. This species eggs are spawned into crevices.

Recent studies indicate that this species is able to outcompete C. lutrensis, especially in areas below reservoirs (Matthews and Marsh-Matthews 2007). Suttkus and Mette (2009) noted the complete extirpation of C. lutrensis from the Sabine River below a reservoir, where C. venusta numbers are stable or increasing.

Systems:

Freshwater

Threats [top]

Major Threat(s):	It is unlikely that Cyprinella venusta is being impacted upon by any major threat processes at present.

Major Threat(s):

It is unlikely that Cyprinella venusta is being impacted upon by any major threat processes at present.

Conservation Actions [top]

Conservation Actions:	There are no species-specific conservation measures in place for Cyprinella venusta. Further study is needed on the taxonomy of this species to ascertain if further revision of the genus is warranted.

Conservation Actions:

There are no species-specific conservation measures in place for Cyprinella venusta. Further study is needed on the taxonomy of this species to ascertain if further revision of the genus is warranted.

Citation:	NatureServe (G. Hammerson) 2010. Cyprinella venusta. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 22 May 2013.
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