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The Geographic Variation of Ambystoma macrodactylum Baird, with the Description of Two New Subspecies
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The Geographic Variation of Ambystoma macrodactylum Baird, with the Description of Two New Subspecies

著者： Denzel E Ferguson
版本/格式： 文章 文章 : 英语
刊登在：American Midland Naturalist, Apr., 1961, vol. 65, no. 2, p. 311-338
数据库：JSTOR
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文件类型： 文章
所有的著者/提供者： Denzel E Ferguson
ISSN:0003-0031
OCLC号码： 476901804
语言注释： English
注意： Fig. 1. -A specimen of Ambystoma macrodactylum columbianum n. ssp. from the type locality in Union Co., Oregon. Body length 58 mm; total length 107 mm.
Fig. 2. -The distribution of the races of Ambystoma macrodactylum omitting Iowa records.
Fig. 3. -An Ambystoma macrodactylum sigillatum n. ssp. from the type locality, Crater Lake, Crater Lake National Park, Oregon. Body length 66 mm; total length 124 mm.
Fig. 4. -A specimen of Ambystoma macrodactylum krausei from 11 miles east of Eisenhower Forks, Banff National Park, Alberta, Canada. Body length 57 mm; total length 98 mm.
Fig. 5. -An example of A. m. macrodactylum collected near Corvallis, Benton County, Oregon. Body length 56 mm; total length 104 mm.
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摘要：

The taxonomic history of the salamander Ambystoma macrodactylum is briefly reviewed. The recently described race A. m. croceum is accepted. Certain differences in color and color pattern of adult animals, especially as concern the dorsal band, indicate the existence of four additional races: A. m. columbianum and A. m. sigillatum, heretofore unrecognized subspecies; A. m. krausei and A. m. macrodactylum, restricted and redefined. For each subspecies, description, distinguishing characteristics, distribution, variations or known local deviants and a list of specimens examined are presented. Sexual dimorphism of the vent is described. Specimens of the four races are pooled into four samples and the means of 14 ratios formed from measurements and counts are compared using a completely randomized Factorial Design, the Analysis of Variance and the Individual Degree of Freedom based on the F distribution. A number of significant differences are demonstrated, lending additional support to the taxonomic separation of the species into the proposed races. A key to adults of the subspecies is given. Life history data pertaining to breeding, larval development and habitat preferences are presented and compared for the various races.

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