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Biosystematics of Peromyscus eremicus, P. guardia, and P. interparietalis

Leonard R. Brand and Raymond E. Ryckman
Journal of Mammalogy
Vol. 50, No. 3 (Aug., 1969), pp. 501-513
DOI: 10.2307/1378777
Stable URL: http://www.jstor.org/stable/1378777
Page Count: 13
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Biosystematics of Peromyscus eremicus, P. guardia, and P. interparietalis
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Abstract

The taxonomic relationship of Peromyscus eremicus, P. guardia, and P. interparietalis was investigated, using hybridization, morphological characters, and blood serum protein electrophoresis. Under laboratory conditions P. interparietalis ryckmani and P. eremicus bred readily, but P. guardia guardia did not breed. Peromyscus interparietalis ryckmani and P. eremicus hybridized freely, producing fertile hybrids, and P. guardia guardia and P. interparietalis ryckmani produced two litters of hybrids. The interparietalis × eremicus hybrid sex ratio was abnormal-19 males and seven females. Peromyscus interparietalis ryckmani and P. eremicus are morphologically distinct, and the hybrids between these populations are morphologically distinguishable from both parental populations, and exhibit heterosis. Blood serum proteins of eremicus, two subspecies of guardia, three subspecies of interparietalis, and hybrids between eremicus and P. interparietalis ryckmani were analyzed by cellulose acetate strip electrophoresis. The protein patterns showed consistent interpopulation differences which tend to support current interpretations of the taxonomy of this group. Serum protein data appear to indicate a closer relationship between eremicus and interparietalis than is suggested by morphological characteristics. Even though eremicus, guardia, and interparietalis are morphologically distinct, they have not diverged sufficiently to have developed mechanisms of intersterility.

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