Morphology, genetics, and ecology of pocket gophers (genus Geomys) in a narrow hybrid zone

摘要: A population of hybrid pocket gophers (Geomys bursarius × G. lutescens) exists 1–2 km west Oakdale, Antelope County, Nebraska, U.S.A. The hybrids occur in soil that has characteristics intermediate between occupied by lutescens (sand) and (silt loam); the vegetation associations on different soils are Sandhills Prairie Tall-grass Prairie, respectively, with mixed prairie soils. Hybrids identifiable basis both qualitative quantitative morphological characteristics, allozymes karyology. Concordance morphological, allozymic, karyotypic ecological data sets is very high. appear to reproduce normally survive well; i.e. they suffer no obvious loss fitness. Backcrossing either parental type apparently rare. species each support obligate parasitic lice (Geomydoecus: Trichodectidae) species; these not sister species. We suggest zones resulting from primary secondary contact may be distinguished (1) concordance clines character sets, (2) fossil biogeographic data, (3) parasite data. conclude this zone resulted contact, maintained selection against (less likely) or superiority (more likely).