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By J. Knox Jones Jr., Sydney Anderson

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Additional resources for Selected readings in mammalogy: Selected from the original literature and introduced with comments (Monograph Museum of Natural History, the University of Kansas)

Sample text

X X X \' . number of currently Dr. Merriam's recognized forms was raised from six to twenty-one. work, however, cleared the way for a better conception of the group, nomenclature rectifying important errors of and making known many Mr. Osgood, with fifteen times this amount of material, seems to have settled all of the remaining doubts regarding the appli- new forms. cation of certain early names, and, besides coordinating the work immensely extended our knowledge of the admirable from every point of view and does of his predecessors, has group.

18 Permit me first many subspecies to observe that HALL: CRITERIA FOR MAMMALS 143 although species and subspecies seem to have the same kinds of distinguishing characters, which appear to be inherited by means of essentially the same kinds of mechanisms in the germ plasm, there are two noteworthy differences between species and subspecies. One already is that, in a species which is continually distributee! over a given implied area, its characters at the boundaries of its range are sharp, definite, and Some of its characters comprised in size, shape and color, at precise.

Nevertheless, one possible criterion for such a division which occurs to me is the relationship between the observed gene flow between two adjacent populations and that amount expected on the basis of the extent of physical contact existing between them. If the observed gene flow havioral barriers free to interbreeding. Although this suggestion for a biologically meaningful subspecies criterion is mainly speculative, it seems to me to be one possible direction that future developments in intraspecific analysis might take.

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