| genetic variation and structure in contrasting geographic distributions: widespread versus restricted black-tailed prairie dogs (subgenus cynomys). | species of restricted distribution are considered more vulnerable to extinction because of low levels of genetic variation relative to widespread taxa. species of the subgenus cynomys are an excellent system to compare genetic variation and degree of genetic structure in contrasting geographic distributions. we assessed levels of genetic variation, genetic structure, and genetic differentiation in widespread cynomys ludovicianus and restricted c. mexicanus using 1997bp from the cytochrome b and ... | 2015 | 26245783 |