Literaturdatenbank
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McAllister, C. T., & Fuller, J. P. (2007). Second report of the southern painted turtle, chrysemys dorsalis (testudines: emydidae), from texas, with comments on its genetic relationship to other populations.(general notes). Texas Journal of Science.
Added by: Admin (15 Mar 2009 13:31:37 UTC) |
| Resource type: Journal Article BibTeX citation key: McAllister2007 View all bibliographic details  |
Categories: General Keywords: Chrysemys, Chrysemys picta, Emydidae, Habitat = habitat, Nordamerika = North America, Schildkröten = turtles + tortoises, Systematik = taxonomy Creators: , Fuller, McAllister Collection: Texas Journal of Science |
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| Abstract |
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The southern painted turtle, Chrysemys dorsalis (Agassiz 1857) is a medium-sized emydid turtle that ranges from western Tennessee south through Alabama and Mississippi and westward to eastern Arkansas, Louisiana, Oklahoma and Texas (Ernst 1971; Iverson 1992; Conant & Collins 1998; Dixon 2002; Trauth et al. 2004). It is one of the best well-studied of all freshwater turtles (see Ernst & Barbour 1989). Starkey et al. (2003) recognized two evolutionary lineages within the genus, C. dorsalis in the southern Mississippi drainage region and Chrysemys picta from the rest of the range of the genus, including records of the latter from Culberson and El Paso counties in far west Texas (Strecker 1915; Carr 1952; Raun & Gehlbach 1972; Thomas 1976; Dixon 2000). Near the northeastern border of Texas (part of the AR-LA-TX region), there are Oklahoma records of C. dorsalis in the extreme southeastern part of the state in McCurtain County (Webb 1970) and records from Bossier and Caddo parishes of northwestern Louisiana (Dundee & Rossman 1989); however, this turtle has not yet been reported in southwestern Arkansas west of the Ouachita River drainage (Trauth et al. 2004) nor has the species been previously collected in extreme northeastern Texas. At the western limit of its range, there appears to be only a single genuine report of C. dorsalis from Texas (see Dixon 2000), a specimen collected from a site near Longview on the Sabine River, Gregg County (West Texas State University, WTSU 6773). Other reports of C. dorsalis in Texas are based on "sight" or "capture and release" records by wildlife biologists from Harrison and Marion counties (Caddo Lake) and Shelby County (Toledo Bend Reservoir) without voucher specimens available for confirmation (see Dixon 2000). ...Trauth et al. 2004). It is one of the best well-studied of all freshwater turtles (see Ernst & Barbour 1989). Starkey et al. (2003) recognized two evolutionary lineages within the genus, C. dorsalis in the southern Mississippi drainage region and Chrysemys picta from the rest of the range of the genus, including records of the latter from Culberson and El Paso counties in far west Texas (Strecker 1915; Carr 1952; Raun & Gehlbach 1972; Thomas 1976; Dixon 2000). Near the northeastern border of Texas (part of the AR-LA-TX region), there are Oklahoma records of C. dorsalis in the extreme southeastern part of the state in McCurtain County (Webb 1970) and records from Bossier and Caddo parishes of northwestern Louisiana (Dundee & Rossman 1989); however, this turtle has not yet been reported in southwestern Arkansas west of the Ouachita River drainage (Trauth et al. 2004) nor has the species been previously collected in extreme northeastern Texas. At the western limit of its range, there appears to be only a single genuine report of C. dorsalis from Texas (see Dixon 2000), a specimen collected from a site near Longview on the Sabine River, Gregg County (West Texas State University, WTSU 6773). Other reports of C. dorsalis in Texas are based on "sight" or "capture and release" records by wildlife biologists from Harrison and Marion counties (Caddo Lake) and Shelby County (Toledo Bend Reservoir) without voucher specimens available for confirmation (see Dixon 2000). In addition, Dixon (2000, map. 48) shows a questionable record (?) for C. dorsalis or C. picta in Wilbarger County of northcentral Texas but it was not possible to locate and verify the identity of this enigmatic specimen. Furthermore, Conant & Collins (1998) placed an "x" on the map in their field guide for C. dorsalis in central Texas, but these specimens are known to have been introduced in Austin, Travis County, based on information provided by W. W. Lamar, and are unfortunately, not native (J. T. Collins pers. comm.). Therefore, this report documents only the second authentic record of C. dorsalis from Texas with a traditional museum voucher specimen, including some comments on its genetic relationship to other samples of C. dorsalis. On 24 June 2004, an adult male C. dorsalis (carapace length = 10.5 cm) was collected by hand while it was crossing the road in the vicinity of Barkman Creek, Bowie County, Texas (3332.9'N, 946.9'W). The specimen was photographed and two months later euthanized on 25 August 2004 with an overdose of sodium pentobarbital (Nembutal ). Tissues (blood, tail, leg muscle, and testes) were taken and placed in 95% ethanol; the specimen was subsequently fixed in 10% formalin and transferred to 70% ethanol. Molecular methods and subsequent analyses follow Starkey et al. (2003) inclusive of the complete suite of data included in that publication. Genetic analyses were completed by comparing the mtDNA D-Loop sequences from this specimen with the rangewide samples evaluated by Starkey et al. (2003). Phenotypically the specimen was typical of C. dorsalis (Fig. 1). The carapace had a light red to orange middorsal stripe (Fig. 1a) with undersides of the marginals conspicuously reddish (Fig. 1b). The plastron was yellowish and except for some widely-scattered stains on the gular, humeral, femoral, and anal scutes, was unmarked (Fig. 1c). The head included some yellow ornamentation with three to four longitudinal stripes (Fig. 1d). The specimen has...
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