Genetic Variation and Systematics of Four Species of Mice of the Peromyscus Boylii Species Group

THE GENETICS OF SPECIATION IN THE RODENT GENUSPEROMYSCUS

“…The highest value of D, 0.068, occurs among populations of P. p. collinus from the Sierra Madre Oriental of northeastern Mexico. Indeed, this subspecies has been shown to represent a heterogeneous group of populations which receive gene flow from P. p. pectoralis on the Mexican plateau, and Kilpatrick and Zimmerman (1976b) at least four loci, Hb, 6-Pgd, Es-L, and Trf-l, contribute to the heterogeneity among the populations of P. p. collinus.…”

“…For the past 6 yr, we have concentrated our efforts on genic variation and the genetics of speciation in species groups of the subgenus Peromyscus, primarily the boylii and truei species groups (Hart and Zimmerman, 1977;Kilpatrick andZimmerman, 1975, 1976a,b;Zimmerman et al, 1975). Whereas studies by several investigators (Avise et al, 1974a,b;Bowers et al, 1973;Garten, 1976;Jensen, 1970;Jensen and Rasmussen, 1971;Johnson and Packard, 1974;Selander et al, 1971;Smith et al, 1973) have increased our understanding of the genetics of various other species of Peromyscus, quantification of the amount of genomic modification accompanying speciation has not been thoroughly examined.…”

“…The subspecies are not allopatric, and there is no evidence that partial reproductive isolation exists between any of the forms (unlike the subspecies of Drosophila). In fact, most of the subspecies we have examined intergrade in narrow zones of contact (Kilpatrick andZimmerman, 1975, 1976b; Schmidly and Schroeter, 1974) . However, chromosomal variation among the subspecies of P. boylii is indicative of the degree of differentiation which has occurred in this taxon (Schmidly and Schroeter, 1974 (2) northeastern Mexico, and (3) central and western Mexico (Kilpatrick and Zimmerman, 1976b).…”

“…In fact, most of the subspecies we have examined intergrade in narrow zones of contact (Kilpatrick andZimmerman, 1975, 1976b; Schmidly and Schroeter, 1974) . However, chromosomal variation among the subspecies of P. boylii is indicative of the degree of differentiation which has occurred in this taxon (Schmidly and Schroeter, 1974 (2) northeastern Mexico, and (3) central and western Mexico (Kilpatrick and Zimmerman, 1976b). Schmidly (1972) and Kilpatrick and Zimmerman (1976b) have demonstrated that morphological and biochemical data correspond remarkably and indicate that there is gene flow between the subspecies of P. pectoralis.…”

“…However, chromosomal variation among the subspecies of P. boylii is indicative of the degree of differentiation which has occurred in this taxon (Schmidly and Schroeter, 1974 (2) northeastern Mexico, and (3) central and western Mexico (Kilpatrick and Zimmerman, 1976b). Schmidly (1972) and Kilpatrick and Zimmerman (1976b) have demonstrated that morphological and biochemical data correspond remarkably and indicate that there is gene flow between the subspecies of P. pectoralis. Furthermore, Schmidly (1972) suggested that subspeciation in P. pectoralis is the result of isolation of three populations in their respective refugia during the Pleistocene.…”