Percina jenkinsi és una espècie de peix de la família dels pèrcids i de l'ordre dels perciformes.[4]
Els mascles poden assolir els 14 cm de longitud total.[5]
És un peix d'aigua dolça, bentopelàgic i de clima subtropical (36°N-34°N).[5]
Es troba a Nord-amèrica: riu Conasauga (conca del riu Alabama) a Tennessee i Geòrgia (els Estats Units).[6]
The Conasauga logperch (Percina jenkinsi) is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to the United States. It is one of 184 species of darters in North America.[4] It has been listed as endangered throughout its range with critical habitat under the U.S. Endangered Species Act since August 5, 1985.[2][5]
This is a slender fish with a maximum length of 4.6 inches (12 cm).[6] They are characterized by the presence of a conical, "pig-like" snout and "tiger-stripe" pattern of numerous dark, vertical bars on a yellowish background. The curious snout development is an apparent adaptation to stone-flipping behavior, in which the snout is used to flip over rocks during feeding.[6] Unlike many other darter species, logperches show little sexual dimorphism in coloration.[7]
The Conasauga logperch is currently known only from an 11-mile reach of the Conasauga River, a Coosa River tributary in northern Georgia and south-central Tennessee.[5][6] Thompson (1985) hypothesized jenkinsi to be derived from Percina caprodes, which entered the Conasauga system from the adjacent Hiwassee system of the Tennessee drainage.[6][8] Specifically, it exists in the Conasauga River from the confluence of Half-way Branch with the Conasauga River in Polk County, Tennessee, downstream approximately 11 miles through Bradley County, Tennessee, to the Georgia State Highway 2 bridge in Murray County, Georgia.[5][9]
Logperch feed on a variety of invertebrates. This species feeds on aquatic invertebrates found under stones.[5] It is known to flip over substrate and prey on disturbed invertebrates.[5] The procedure of flipping substrate makes available to them a wide range of organisms including larvae of midges, mayflies, caddisflies, riffle beetles, stoneflies, limpets, and fish eggs. Young feed on microcrustaceans.[6] It is most likely that introduced rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta) are the main predators for this species.[5] Sexual maturity is reached after one year and spawning occurs in spring, in fast riffles over gravel substrate.[5] The fish has a maximum life span of at least four years.[5] Logperch are in a clade of darters that exhibit little ecological variation among species. Males are nonterritorial and several may follow a single female until breeding takes place.[6] The parents bury the fertilized eggs in the substrate. Exposed eggs are usually eaten by other males. Eggs are adhesive and demersal (heavier than water) thus allowing them to remain in the substrate. Hatching requires 200 hours.[6] Clutch size is not documented and varies greatly in the genus Percina; fecundity of Percina caprodes females is high, ranging from 1,000 to 3,000 ova per year, while Percina evides females have been observed with a fecundity of only about 130 to 400 ova per year.[6]
The Conasauga logperch was first formally described in 1985 by the American ichthyologist Dr. Bruce A. Thompson (1946-2007)[10] and its specific name honors Thompson's fellow ichthyologist Robert E. Jenkins of Roanoke College.[11]
Percina jenkinsi has been federally listed as endangered throughout its range with critical habitat on August 5, 1986.[2][12] A recovery plan was completed on June 20, 1986.[5] At their Knoxville nonprofit, Conservation Fisheries, INC. (CFI) J.R. Shutes and Pat Rakes are trying to keep this rare species alive. The Conasauga River might hold a limited 200 individuals of this species and CFI holds three, the only ones in captivity. The goal is to have seed stock ready to restore the fish to the river, if and when society restores that river to its clean, free-flowing state. The Tennessee Aquarium in Chattanooga, and other private facilities, and state and federal wildlife agencies have efforts under way as well. The Southeastern Fishes Council put together a list they call the Desperate Dozen, "the twelve fish most likely to become extinct soon," and this list includes Percina jenkinsi. [12] Current management includes preserving the Conasauga river populations and presently used habitat, utilize existing legislation of the Federal Endangered Species Act for water quality regulations, stream alteration regulations, etc., conduct life history research on the species to include reproduction, food habits, age and growth, and mortality factors, determine the number of individuals required to maintain a viable population, and searching for additional populations and habitats suitable for reintroduction efforts.[5] The Forest Service is playing a lead role in conservation efforts in the upper watershed. The Conasauga River Alliance—a partnership of local citizens, businesses, conservation groups, and government agencies—is coordinating conservation activities in the middle section of the watershed. Both are active and assist each other throughout these parts of the watershed.[13] Other partnerships include U.S. Fish and Wildlife Service, NC State University, Regional Solid Waste Management Authority, local industries and utility companies, Georgia DNR, private and public landowners, volunteers, and local city and county governments.[14]
The Conasauga logperch (Percina jenkinsi) is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is endemic to the United States. It is one of 184 species of darters in North America. It has been listed as endangered throughout its range with critical habitat under the U.S. Endangered Species Act since August 5, 1985.
Percina jenkinsi es una especie de peces de la familia Percidae en el orden de los Perciformes.
Los machos pueden llegar alcanzar los 14 cm de longitud total.[2]
Se encuentran en Norteamérica: Tennessee y Georgia.
Percina jenkinsi is een straalvinnige vissensoort uit de familie van de echte baarzen (Percidae).[2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1985 door Thompson.
Bronnen, noten en/of referenties
Percina jenkinsi é uma espécie de peixe da família Percidae.
É endémica dos Estados Unidos da América.[1]
Percina jenkinsi é uma espécie de peixe da família Percidae.
É endémica dos Estados Unidos da América.
The conasauga logperch (Percina jenkinsi) là một loài cá thuộc họ Percidae. Nó là loài đặc hữu của Hoa Kỳ.
Annonymous. 2005. The Nature Conservancy in Georgia: Conasauga River. http://www.nature.org/wherewework/northamerica/states/georgia/files/conasauga_river_fact_sheet.pdf.
Chadwick D.H. 2010. Silent streams: freshwater animals are vanishing faster than those on land or at sea, but captive-breeding programs hold out hope. National Geographic 16: 116.
Dutton D.J., J.H. Roberts, P.L. Angermeier, and E.M. Hallerman. 2008. Microsatellite markers for the endangered Roanoke logperch, Percina rex (Percidae) and their potential utility for other darter species. Molecular Ecology Resources 8:/ 831-834.
Freeman B.J. and M.C. Freeman. 1994. Habitat use by an endangered riverine fish and implications for species protection. Ecology of Freshwater Fish 3: 49-58.
Helfman, G.S., Collette, B.B., Facey, D.E., & Bowen, B.W. (2009). The diversity of fishes. West Sussex, UK: Wiley-Blackwell.
Ivey, G, and K. Evans. 2000. Conasauga river alliance business plan; Conasauga River Watershed Ecosystem Project. http://www.fs.fed.us/largewatershedprojects/businessplans/.
Near T.J. and M.F. Benard. 2004. Rapid allopatric speciation in logperch darters (Percidae: Percina ). Evolution 58(12): 2798-2808.
Starnes, W.C, & Etnier, D.A. (1993). The fishes of Tennessee. Knoxville, TN: The University of Tennessee Press.
Thompson B.A., J.D. Williams, and D.A. Etnier. 1986. Recovery plan for Conasauga logperch (Percina jenkinsi) and Amber darter (Percins antesella). U.S. Fish and Wildlife Service: Atlanta, Georgia. 34 pp.
Williams J.D., D.A. Neely, S.J. Walsh, and N.M. Burkhead. 2007. Three new percid fishes (Percidae: Percina) from the Mobile basin drainage of Alabama, Georgia, and Tennessee. Zootaxa 15490:/ 1-28.
The conasauga logperch (Percina jenkinsi) là một loài cá thuộc họ Percidae. Nó là loài đặc hữu của Hoa Kỳ.
詹氏小鱸（學名：Percina jenkinsi）為輻鰭魚綱鱸形目鱸亞目河鱸科的其中一種，被IUCN列為次級保育類動物，分布於美國喬治亞州、田納西州的Conasauga河流域，體長可達14公分，棲息在礫石底質的急流。
这是一篇與鱸形目相關的小作品。你可以通过编辑或修订扩充其内容。 
