...Isolated populations occur in the Chisos and Davis mountains of Trans-Pecos Texas... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The sex ratios of several small collections from natural populations varied, and no conclusions could be drawn...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Because of its diurnal habits and the concentration ofits populations along watercourses, it is not likely to be overlooked...
Henry S. Fitch 「Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains」
...baudini and sordida wasthe result of genetic changes in geographically isolated populations...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...—As is evident in the diagnoses, the color patternsof given populations have been regarded as useful in separating thespecies and subspecies...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...Lacking evidence of geneticexchange, I prefer to retain disjunct populations that are distinctiveas species...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...I have therefore recognized allmorphologically distinct allopatric populations as species...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...Our small samples of birds and reptiles from the island show nodetectable morphological differentiation from adjacent populations...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...Fish populations, following a drought, in the Neosho and Marais des Cygnes rivers of Kansas...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...Major results of this include isolation of certain populations and absence of others in the boreal islands...
Emil K. Urban 「Birds from Coahuila, Mexico」
...The importance of these linear woodlands as avenues for gene-flowbetween eastern and western populations, especially of species-pairs(grosbeaks, flickers, orioles, and buntings), is obviously great...
Richard F. Johnston 「The Breeding Birds of Kansas」
...longicauda Baird occurs west of stations inDecatur, Lane, and Meade counties; the intervening populations are ofintermediate morphologic character...
Richard F. Johnston 「The Breeding Birds of Kansas」
...There is a continuing demand from sheep ranchers in the county thatfoxes be controlled, yet this species seems to maintain considerablyhigher populations than does the coyote...
Kenneth W. Andersen 「Mammals of Northwestern South Dakota」
...Long ago nature must haveestablished a fairly definite ratio between the populations of the Wolfand the Caribou...
Francis Harper 「The Barren Ground Caribou of Keewatin」
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