NDLI: Comparative population genetics of aquatic turtles in the desert

Content Provider	Springer Nature Link
Author	McGaugh, Suzanne E.
Copyright Year	2012
Abstract	In a desert-spring ecosystem, the desert can be a formidable barrier to dispersal for species with sensitivity to desiccation. In the desert-spring ecosystem of Cuatro Ciénegas, México, three endemic turtle species, all of conservation concern, have overlapping ranges but different requirements for aquatic habitat. By using existing genetic markers and generating new ones using next-generation sequencing, I compared the population genetic structure of two of these endemic turtles. The aquatic slider turtle, Trachemys taylori, exhibited significant isolation by distance and genetic differentiation among populations. However, stronger genetic structure was identified for the obligate aquatic softshell turtle, Apalone atra. For Apalone, no correlation of genetic differentiation with geographic distance was observed, as most populations appear genetically distinct from one another. This evidence, combined with allelic and heterozygosity patterns, suggests that the desert matrix is a sufficient barrier to dispersal for the softshell turtles but less of a barrier for the more terrestrial slider turtles. It appears that softshell turtles from each pond may have been relatively isolated from other ponds since the basin became substantially drier near the beginning of the Holocene. This strong population genetic structure of the two aquatic species is in contrast to the near panmixia of the third endemic, the previously studied semi-aquatic box turtle, Terrapene coahuila. Separately, the issue of hybridization of the endemic turtles with invasive congeners has been raised as a conservation concern, but detailed genetic assessment of potential hybridization has not been performed. In this study, hybridization of the endemic slider with its invasive congener was assessed and not detected with genetic data. Also, it appears that different color morphs of Apalone in the basin, which are currently designated as separate species, are not genetically distinct at the loci examined in this work.
Starting Page	1561
Ending Page	1576
Page Count	16
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	13
Issue Number	6
e-ISSN	15729737
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-09-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Apalone Trachemys Terrapene Next-generation sequencing Cuatro Ciénegas Plant Sciences Evolutionary Biology Animal Anatomy / Morphology / Histology Conservation Biology/Ecology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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