Procambarus pictus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Malacostraca Decapoda Cambaridae

Scientific Name: Procambarus pictus (Hobbs, 1940)
Common Name(s):
English Black Creek Crayfish, Spotted Royal Crayfish

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2010
Date Assessed: 2010-06-01
Assessor(s): Moler, P. & Crandall, K.A.
Reviewer(s): Collen, B. & Richman, N.
Contributor(s): Livingston, F., Livingston, F., Soulsby, A.-M., Batchelor, A., Dyer, E., Whitton, F., Milligan, H.T., Smith, J., Lutz, M.L., De Silva, R., McGuinness, S., Kasthala, G., Jopling, B., Sullivan, K. & Cryer, G.
Procambarus pictus has been assessed as Near Threatened. This species almost meets the requirements for Endangered under Criteria B, as it has an extent of occurrence of 1,600 km² and is endemic to the Black Creek river system. There is a reported continuing decline in the quality of this species habitat due to ecosystem modification and ongoing habitat destruction and degradation, however this species is known from a number of collection localities where there appears to be genetic interchange. Further research is needed to determine over how much of its range it is undergoing a decline and therefore if it warrants listing in a threatened category.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is known from several small tributaries of Black Creek in Clay County, a tributary to the St. Johns River in Duval County, Florida (Franz and Franz 1979). It is also reported from Putnam County (NatureServe 2009), in the upper Etoniah Creek system (P. Moler pers. comm. 2010). It is known from three stream systems (Black and Etoniah creeks, and a small stream near Fort Caroline). There have been many collecting sites (over 30, mostly in Black Creek) within these systems. In addition, potential gene flow probably occurs among most or all sites within each system (K. Crandall pers. comm. 2009). This species has a distribution of approximately 1,600 km².
Countries occurrence:
United States (Florida)
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species has been collected from over 30 sites, mostly within the Black Creek system (Burgess and Franz 1978). In addition, potential gene flow probably occurs among most or all sites within each system (K. Crandall pers. comm. 2009), and it was found in greatest density in headwater sections (Franz and Franz 1979).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:Unknown

Habitat and Ecology [top]

Habitat and Ecology:This species is found in headwater streams, and in small and large tributaries within its range (Franz and Franz 1979). It has been collected in cool, tannic-stained, flowing streams, and was found to be absent from sluggish flowing sections (Franz and Franz 1979).

Threats [top]

Major Threat(s): This species is sensitive to human alterations of the headwater areas, and to water pollution such as siltation and sewage (Franz and Franz 1979). The Black Creek is situated close to the Jacksonville metropolitan area and so is under pressure from expanding urbanization. Land developers have cleared large tracts of land, and have built residential areas. Several areas of the creek have been altered by damming (Franz and Franz 1979). Flatwood areas have been drained, and extensive canal systems have been constructed and roads built. Erosion caused by the roads and canals has caused extensive siltation to occur in the headwater streams. The siltation has removed substrate detritus and eliminated the pools created by root mats and logs. Widespread run-off from surrounding dairy farms and human sewage have also created open sewers along several of the South Fork tributaries and no individuals of this species have been recorded in these areas (K. Crandall pers. comm. 2009).

Conservation Actions [top]

Conservation Actions: This species has been given a NatureServe Global Heritage Status Rank of G2, and was assigned an American Fisheries Society Status of 'threatened' based on its restricted range and ongoing habitat degradation (Taylor et al. 2007, NatureServe 2009). Further research is needed to determine over how much of its range this species is undergoing a decline.

Citation: Moler, P. & Crandall, K.A. 2010. Procambarus pictus. The IUCN Red List of Threatened Species 2010: e.T18213A7811189. . Downloaded on 21 June 2018.
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