|Scientific Name:||Percina lenticula|
|Species Authority:||Richards & Knapp, 1964|
|Red List Category & Criteria:||Near Threatened ver 3.1|
|Reviewer(s):||Smith, K. & Darwall, W.R.T.|
|Facilitator/Compiler(s):||Hammerson, G.A. & Ormes, M.|
This species is listed as Near Threatened because its area of occupancy may be less than 2,000 sq km and its distribution and abundance probably are slowly declining due to continuing habitat degradation. However, the distribution is fragmented but not severely so, and the number of locations is unknown but exceeds 10, so the species does not fully meet the criteria for the Vulnerable category.
|Range Description:||Range includes the Pearl, Pascagoula, Lake Pontchartrain, and Mobile Bay drainages of Louisiana, Mississippi, Alabama, and Georgia (Page and Burr 2011). In Alabama, the range includes the Tombigbee, Cahaba, Coosa, lower Tallapoosa, and Alabama rivers, as well as the Alabama River below the Alabama-Tallapoosa cutoff (Boschung and Mayden 2004). In Mississippi, the range includes most systems in the Pascagoula drainage, a few streams in the Pearl River drainage (lower part only, rare), and two systems in the Tombigbee drainage (but most records predate the construction of the Tennessee-Tombigbee Waterway) (Ross 2001). In Georgia, populations are limited to the upper Conasauga and upper Etowah Rivers (Freeman and Wenger 2006).|
|Range Map:||Click here to open the map viewer and explore range.|
This species is represented by a fairly large number of occurrences (subpopulations).
Total adult population size is unknown. This species is generally regarded as rare, but it is relatively difficult to collect, so it may be more common than available records indicate (Boschung and Mayden 2004).
This species experienced a major decline with construction of the Tenn-Tom waterway in Mississippi and Alabama. Abundance is probably down when compared to historic population levels. "Collecting efforts since 1970 have produced relatively few specimens, indicating a general decline in local populations" (Boschung and Mayden 2004). In Mississippi, populations in the Pascagoula drainage seem to be stable (Ross 2001).
Trend over the past 10 years or three generations is uncertain, but distribution and abundance probably are slowly declining.
|Habitat and Ecology:||Habitat includes fast, deep rocky riffles of small to medium rivers (Page and Burr 2011). Adults are most common in moderate-fast current, in deeper water (0.8 m) in heavy cover such as log jams, undercut banks, boulders, or potholes. Juveniles occur in shallower water with slower current, such as in vegetation in gently flowing riffles. Dams, impoundments, and inappropriate stream conditions hinder the movements of this darter (Pierson pers. comm. 1998).|
|Major Threat(s):||Threats include stream channelization, impoundment, siltation from extensive clear-cutting, and point source pollution from mining discharges. The Tennessee-Tombigbee Waterway construction and impoundments probably eliminated many populations.|
Life history and especially spawning information is greatly needed.
Monitor known populations; resurvey the Tombigbee drainage to determine if populations still occur in the larger tributaries.
Prevent siltation or other pollution of known habitat; avoid extensive clear-cutting of the watershed. Maintain free-flowing stream habitat.
|Citation:||NatureServe 2014. Percina lenticula. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 29 July 2015.|
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