... Bailey (1948:215) discussed the possibility that populations of snakes may be significantly depressed because of winter kill of individuals that "hibernate" at shallow depths... 
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)」
...Mortality rate at birth is high in captive individuals but has not been determined in natural populations...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
... (1908:166-173) allocatedall western sirtalis to either parietalis or concinnus, thelatterincluding the populations of the northwest coast in Oregon, Washingtonand British Columbia...
Henry S. Fitch 「Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains」
...sirtalis in the Río Grande drainage of New Mexico isgeographically isolated and remote from other populations of thespecies...
Henry S. Fitch 「Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains」
...Like most widely ranging subspecies, parietalis and fitchi varygeographically and local populations often are noticeably differentfrom typical material...
Henry S. Fitch 「Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains」
...In these cranial characters, specimens from the MesetaCentral are intermediate between the two lowland populations...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Both populations agree in othermorphological characters; therefore, they are here treated as geographicvariants...
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」
...The fact that pocket gophers from the Tamaulipan barrier islandoccupy a position geographically intermediate between presentTexan populations and the isolated population in southern Tamaulipas(G...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...tropicalis,its degree of isolation from other populations has been muchgreater than those of populations inhabiting the Tamaulipan barrierisland and the barrier islands of the coast of Texas...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...sennetti; the resemblanceof the two insular populations would thus be a matter ofconvergence in response to like environmental conditions...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...Many times it has been said thatthe populations of wild animals were declining in México because thenumber of game wardens is too small to protect game in all parts of thecountry...
Ticul Alvarez 「The Recent Mammals of Tamaulipas, Mexico」
..."The nearest populations now are far to the north, and this jumping mouseoccupies only restricted habitats in northwestern South Dakota andadjacent regions...
Kenneth W. Andersen 「Mammals of Northwestern South Dakota」
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