Semotilus thoreauianus - Jordan, 1877
Dixie Chub
Taxonomic Status: Accepted
Related ITIS Name(s): Semotilus thoreauianus Jordan, 1877 (TSN 163379)
Unique Identifier: ELEMENT_GLOBAL.2.105248
Element Code: AFCJB41050
Informal Taxonomy: Animals, Vertebrates - Fishes - Bony Fishes - Minnows and Carps
Image 1135

© Howard L. Jelks

 
Kingdom Phylum Class Order Family Genus
Animalia Craniata Actinopterygii Cypriniformes Cyprinidae Semotilus
Genus Size: B - Very small genus (2-5 species)
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Concept Reference
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Concept Reference: Robins, 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.
Concept Reference Code: B91ROB01NAUS
Name Used in Concept Reference: Semotilus thoreauianus
Taxonomic Comments: Formerly included in S. atromaculatus; syntopic with atromaculatus without evidence of interbreeding in Black Warrior and Cahaba rivers; some evidence of hybridization in upper Tallapoosa River (Johnson and Ramsey 1990). The 1991 AFS checklist (Robins et al. 1991) followed Johnson and Ramsey (1990) in raising thoreauianus to full species status.
Conservation Status
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NatureServe Status

Global Status: G4
Global Status Last Reviewed: 26Sep1997
Global Status Last Changed: 26Sep1997
Rounded Global Status: G4 - Apparently Secure
Nation: United States
National Status: N4 (27Mar2012)

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Alabama (S4), Florida (SNR), Georgia (SNR)

Other Statuses

IUCN Red List Category: LC - Least concern

NatureServe Global Conservation Status Factors

Range Extent: 20,000-200,000 square km (about 8000-80,000 square miles)
Range Extent Comments: Range includes Gulf Slope drainages from the Ochlockonee River system, Georgia and Florida, to the Tombigbee River system, Alabama (Page and Burr 2011).

Number of Occurrences: 81 - 300
Number of Occurrences Comments: This species is represented by a large number of occurrences (subpopulations). Johnston and Ramsey (1990) mapped 73 collection sites, with 16 in Florida, 42 in Alabama, and 15 in Georgia. Boschung and Mayden (2004) mapped more than 100 collection sites from Alabama. Mettee et al. (1996) mapped 190 historical collection stations in Alabama; has been collected at 56 of these stations since 1985 and over 50% of the stations since 1980 (S. Mettee, pers. comm., 1997). Estimated 101+ extant populations rangewide (C. Gilbert, pers. comm., 1997).

Population Size Comments: This species is never found in large numbers in Alabama (Boschung and Mayden 2004), though some report it as abundant in small headwater streams (M. Pierson, pers. comm., 1997). It is common below the Fall Line (Page and Burr 2011).

Overall Threat Impact Comments: This species is not threatened; it occurs in small streams, and the topography of the area prevents agriculture from encroaching to the stream's edge (S. Mettee, pers. comm., 1997). No threats, very common in small to medium sized streams; one of the last species to disappear in impacted streams, even in urban settings (B. Kuhajda, pers. comm., 1997). No specific threats (C. Gilbert, pers. comm., 1997).

Short-term Trend: Relatively Stable (<=10% change)
Short-term Trend Comments: Stable (S. Mettee and C. Gilbert, pers. comm., 1997); very stable (B. Kuhajda, pers. comm., 1997); probably stable (M. Pierson, pers. comm., 1997). In Alabama, populations show no obvious signs of stress (Boschung and Mayden 2004).

Other NatureServe Conservation Status Information

Inventory Needs: Determine current distribution and abundance.

Distribution
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Global Range: (20,000-200,000 square km (about 8000-80,000 square miles)) Range includes Gulf Slope drainages from the Ochlockonee River system, Georgia and Florida, to the Tombigbee River system, Alabama (Page and Burr 2011).

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map
Endemism: endemic to a single nation

U.S. & Canada State/Province Distribution
United States AL, FL, GA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AL Perry (01105)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
03 Upper Ochlockonee (03120002), Lower Ochlockonee (03120003), Upper Chattahoochee (03130001), Middle Chattahoochee-Lake Harding (03130002), Middle Chattahoochee-Walter F. George Reservoir (03130003), Lower Chattahoochee (03130004), Upper Flint (03130005), Middle Flint (03130006), Kinchafoonee-Muckalee (03130007), Lower Flint (03130008), Ichawaynochaway (03130009), Apalachicola (03130011), Chipola (03130012), Yellow (03140103), Blackwater (03140104), Perdido (03140106), Upper Choctawhatchee (03140201), Pea (03140202), Lower Choctawhatchee (03140203), Upper Conecuh (03140301), Patsaliga (03140302), Sepulga (03140303), Lower Conecuh (03140304), Escambia (03140305), Lower Coosa (03150107), Upper Tallapoosa (03150108), Middle Tallapoosa (03150109), Lower Tallapoosa (03150110), Upper Alabama (03150201), Cahaba (03150202)+, Middle Alabama (03150203), Lower Alabama (03150204), Buttahatchee (03160103), Luxapallila (03160105), Middle Tombigbee-Lubbub (03160106), Sipsey (03160107), Noxubee (03160108), Sipsey Fork (03160110), Locust (03160111), Upper Black Warrior (03160112), Lower Black Warrior (03160113), Middle Tombigbee-Chickasaw (03160201), Sucarnoochee (03160202), Lower Tambigbee (03160203), Mobile - Tensaw (03160204)
06 Pickwick Lake (06030005), Bear (06030006)
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
U.S. Distribution by Watershed (based on multiple information sources) Help
Ecology & Life History
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Basic Description: Dixie chub, Cyprinidae.
Habitat Type: Freshwater
Non-Migrant: Y
Locally Migrant: N
Long Distance Migrant: N
Riverine Habitat(s): CREEK, High gradient, MEDIUM RIVER, Moderate gradient, Pool
Special Habitat Factors: Benthic
Habitat Comments: Small, clear headwater streams (Johnson and Ramsey 1990). Sand- and gravel-bottomed pools of creeks and small rivers (Page and Burr 1991). Males construct pit/ridge nests in gravel bottom. Eggs laid in nests (apparently of this species) on the bottom were in runs below pools with undercut banks (Johnson and Ramsey 1990).
Length: 15 centimeters
Economic Attributes Not yet assessed
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Management Summary
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Biological Research Needs: Determine basic life history.
Population/Occurrence Delineation
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Group Name: Medium Cyprinids

Use Class: Not applicable
Minimum Criteria for an Occurrence: Occurrences are based on evidence of historical presence, or current and likely recurring presence, at a given location. Such evidence minimally includes collection or reliable observation and documentation of one or more individuals (including eggs and larvae) in appropriate habitat.
Separation Barriers: Dam lacking a suitable fishway; high waterfall; upland habitat.
Separation Distance for Unsuitable Habitat: 15 km
Separation Distance for Suitable Habitat: 15 km
Separation Justification: Data on dispersal and other movements generally are not available. In some species, individuals may migrate variable distances between spawning areas and nonspawning habitats.

Separation distances (in aquatic kilometers) for cyprinids are arbitrary but reflect the presumption that movements and appropriate separation distances generally should increase with fish size. Hence small, medium, and large cyprinids, respectively, have increasingly large separation distances. Separation distance reflects the likely low probability that two occupied locations separated by less than many kilometers of aquatic habitat would represent truly independent populations over the long term.

Because of the difficulty in defining suitable versus unsuitable habitat, especially with respect to dispersal, and to simplify the delineation of occurrences, a single separation distance is used regardless of habitat quality.

Occupied locations that are separated by a gap of 15 km or more of any aquatic habitat that is not known to be occupied represent different occurrences. However, it is important to evaluate seasonal changes in habitat to ensure that an occupied habitat occurrence for a particular population does not artificially separate spawning areas and nonspawning areas as different occurrences simply because there have been no collections/observations in an intervening area that may exceed the separation distance.

Date: 21Sep2004
Author: Hammerson, G.
Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 27Mar2012
NatureServe Conservation Status Factors Author: Hammerson, G., and M. K. Clausen
Element Ecology & Life History Edition Date: 01Oct1993
Element Ecology & Life History Author(s): Hammerson, G.

Zoological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).

References
Help
  • Johnson, C. E., and J. S. Ramsey. 1990. Redescription of Semotilus thoreauianus Jordan, 1877, a cyprinid fish of the southeastern United States. Copeia 1990:119-130.

  • Nelson, J. S., E. J. Crossman, H. Espinosa-Perez, L. T. Findley, C. R. Gilbert, R. N. Lea, and J. D. Williams. 2004. Common and scientific names of fishes from the United States, Canada, and Mexico. American Fisheries Society, Special Publication 29, Bethesda, Maryland. 386 pp.

  • Page, L. M., H. Espinosa-Pérez, L. T. Findley, C. R. Gilbert, R. N. Lea, N. E. Mandrak, R. L. Mayden, and J. S. Nelson. 2013. Common and scientific names of fishes from the United States, Canada, and Mexico. Seventh edition. American Fisheries Society, Special Publication 34, Bethesda, Maryland.

  • Page, L. M., and B. M. Burr. 1991. A field guide to freshwater fishes: North America north of Mexico. Houghton Mifflin Company, Boston, Massachusetts. 432 pp.

  • Page, L. M., and B. M. Burr. 2011. Peterson field guide to freshwater fishes of North America north of Mexico. Second edition. Houghton Mifflin Harcourt, Boston. xix + 663 pp.

  • Page, LM, H.Espinoza-Perez, L.Findley, C.Gilbert, R. Lea, N. Mandrak, R.Mayden and J.Nelson. 2013. Common and scientific names of fishes from the United States, Canada, and Mexico, 7th edition. American Fisheries Society, Special Publication 34, Bethesda, Maryland.

  • Robins, 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.

References for Watershed Distribution Map
  • Boschung, H. T., and R. L. Mayden. 2004. Fishes of Alabama. Smithsonian Institution Press, Washington, D.C. 960 pp.

  • Mettee, M. F., P. E. O'Neil, and J. M. Pierson. 1996. Fishes of Alabama and the Mobile Basin. Oxmoor House, Birmingham, Alabama. 820 pp.

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