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

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    Heaney&Timm1985.pdf (1.127Mb)
    Issue Date
    1985
    Author
    Heaney, Lawrence R.
    Timm, Robert M.
    Publisher
    Biological Journal of the Linnean Society
    Type
    Article
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    Abstract
    A population of hybrid pocket gophers (Geomys bursarius × G. lutescens) exists 1–2 km west of Oakdale, Antelope County, Nebraska, U.S.A. The hybrids occur in soil that has characteristics intermediate between that occupied by G. lutescens (sand) and by G. bursarius (silt loam); the vegetation associations on the different soils are Sandhills Prairie and Tall-grass Prairie, respectively, with mixed prairie on the intermediate soils. Hybrids are identifiable on the basis of both qualitative and quantitative morphological characteristics, allozymes and karyology. Concordance between morphological, allozymic, karyotypic and ecological data sets is very high. Hybrids appear to reproduce normally and survive well; i.e. they suffer no obvious loss of fitness. Backcrossing to either parental type is apparently rare. The parental species each support obligate parasitic lice (Geomydoecus: Trichodectidae) of different species; these species are not sister species. We suggest that hybrid zones resulting from primary and secondary contact may be distinguished by (1) concordance of clines in different character sets, (2) fossil and biogeographic data, and (3) parasite data. We conclude that this zone resulted from secondary contact, and that the zone is maintained either by selection against hybrids (less likely) or by hybrid superiority (more likely).
    URI
    http://hdl.handle.net/1808/4565
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    • Ecology & Evolutionary Biology Scholarly Works [1493]
    • Center for Latin American and Caribbean Studies Scholarly Works [738]
    • Kansas African Studies Center Scholarly Works [272]
    Citation
    Heaney, L. R. and R. M. Timm. 1985. Morphology, genetics, and ecology of pocket gophers (genus Geomys) in a narrow hybrid zone. Biological Journal of the Linnean Society 25:301–317.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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