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CHROMOSOMAL HOMOLOGY AND DIVERGENCE BETWEEN SIBLING SPECIES

From a chromosomal standpoint, speciation in the Peromyscus maniculatus complex has been accompanied by considerable change in the number of arms in the autosomal complement. This report is concerned with a determination of the chromosomal homologies and types of chromosomal rearrangements between two members of this complex, P. melanotis and P. maniculatus, as determined by Gand Cband comparisons. This study was undertaken to document the level of chromosomal evolution that is characteristic of some sibling species as well as to provide some insight into the evolutionary history of these two species. The diploid number for all species of Peromyscus thus far described is 48. Numerous authors have, however, documented extensive chromosomal variation dealing with the number of chromosome arms in Peromyscus (Hsu and Arrighi, 1966; Ohno et al., 1966; Singh and McMillan, 1966; Sparkes and Arakaki, 1966; Hsu and Arrighi, 1968; Arakaki et al., 1970; T e and Dawson, 1971 ; Bradshaw and Hsu, 1972; Lee et al., 1972; Bowers et al., 1973; Pathak et al., 1973; Arrighi et al., 1976; Schmidly and Schroeter, 1974; Murray and Kitchin, 1976). Hsu and Arrighi (1968) described the karyotype for 19 species of Peromyscus and reported both interand intraspecific variation of 56-96 in the total number of chromosome arms. Bradshaw and Hsu ( 1972) documented chromosomal variation in 15 subspecies of