| phylogenetic evidence of mitochondrial dna introgression among pocket gophers in new mexico (family geomyidae). | mitochondrial dna (mtdna) variation in the cytochrome b gene was determined for two divergent taxa of pocket gophers, thomomys bottae actuosus and t. b. ruidosae. these two taxa hybridize in a narrow contact zone, but introgression of nuclear markers such as allozymes or chromosomes does not extend much beyond the hybrid zone (patton et al. 1979). we found that despite their distinctness, the two subspecies shared very similar mtdna haplotypes. by a comparison of phylogenetic histories derived f ... | 1997 | 9161013 |