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Lindeman, P. V. , Turtle range limits, the limitations of the literature, and the limits of our imaginations: Recent examples from the genus graptemys - abstract. Unpublished paper presented at Program and Abstracts of the Tenth Annual Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles. 
Added by: Sarina Wunderlich (06 Jul 2014 16:11:48 UTC)
Resource type: Conference Paper
BibTeX citation key: anon2013.16245
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Categories: General
Keywords: Emydidae, Habitat - habitat, Kinosternidae, Kinosternon subrubrum, Nordamerika - North America, Pseudemys concinna, Schildkröten - turtles + tortoises, Sternotherus odoratus
Creators: Lindeman
Collection: Program and Abstracts of the Tenth Annual Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles
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Abstract     
Published statements regarding the geographic ranges of freshwater turtle species may too often be taken as definitive statements about the limits of the range rather than the limits of the extent of sampling. In the 14 map turtle and sawback species of the genus Graptemys, recent new records for upstream distribution in rivers of known occupancy, as well as recent new records of occurrence in tributary streams not previously known to be part of the range, are both surprisingly common, particularly given the emphasis on range restriction for eleven Gulf Coastal species in the genus in the southern United States. All eleven of the range-restricted species have had range extensions discovered recently, in some cases regarding relatively large and widespread populations. A notable example concerns the Texas Map Turtle, Graptemys versa, a species of the Colorado River and its tributaries. Graptemys versa is regarded in multiple literature sources as being “primarily” restricted to the Edwards Plateau of Texas or even “endemic” to the plateau, although specimen records have existed for four off-plateau localities in three counties for several years. Recent observations provide additional off-plateau records in two additional counties. Further, these observations demonstrate that the Edwards Plateau probably does not even contain the largest and densest populations of G. versa, a fact that likely has been missed because of inertia brought about by descriptions of the species’ range in the literature. Freshwater turtle conservation biologists need to (a) critically examine the basis for statements of range limits of species that are made in the literature; (b) search in regions of potentially suitable habitat for possible range extensions; and (c) fully report negative search results in order to properly distinguish between limits of sampling effort and actual limits of range.
Added by: Sarina Wunderlich  
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