Hybrid Pocket Gophers and Some Thoughts on the Relationship of Natural Hybrids to the Rules of Nomenclature and the Endangered Species Act

Jones, J. Knox; Bradley, Robert D.; Baker, Robert J.

doi:10.2307/1382313

Cited by 16 publications

(13 citation statements)

References 30 publications

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“…A historical hybrid zone occurs in Runnels County, Texas, between G. b. major and G. knoxjonesi, possibly during the end of the Pleistocene or early Holocene (Jones et al 1995). At the New Mexico contact zone between G. b. major and G. knoxjonesi, most of the hybrid crosses were between females of G. knoxjonesi and males of G. b. major (Baker et al 1989).…”

Section: Geneticsmentioning

confidence: 99%

Geomys bursarius (Rodentia: Geomyidae)

Connior

2011

Mammalian Species

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Section: Geneticsmentioning

confidence: 99%

Geomys bursarius (Rodentia: Geomyidae)

Connior

2011

Mammalian Species

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“…Traits likely subjected to selection that are carried by nuclear genes (reproductive strategy, aposematic coloration pattern) spread quickly through the populations in contact, producing a homogenizing effect at the nuclear level, decoupled from the underlying mtDNA structure. Even without selection for nuclear markers, successive range shifts and repetitive backcrosses and genetic drift likely would have resulted in discordances between the mtDNA and nuclear markers (Jones et al 1995;Ruedi et al 1997). As a result of these processes, the front of the eastern nuclear contact zone in Salamandra has been displaced progressively eastward until its present location in the western Pyrenees, while the mtDNA contact zone remained closer to the site at which the secondary contact first occurred, in the Cantabrian Mountains.…”

Section: Evolution Of Viviparity In Salamandramentioning

confidence: 99%

Dispersal of Viviparity Across Contact Zones in Iberian Populations of Fire Salamanders (Salamandra) Inferred From Discordance of Genetic and Morphological Traits

et al. 2003

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We used partial sequences of the cytochrome b mitochondrial DNA (mtDNA) gene, obtained from 76 individuals representing 45 populations of Iberian Salamandra salamandra plus 15 sequences of additional species of Salamandra and related genera, to investigate contact zones. These zones, identified by earlier allozymic and morphological analyses, are between populations of viviparous (S. s. bernardezi and S. s. fastuosa) and ovoviviparous (S. s. gallaica and S. s. terrestris) salamanders. The distribution of mtDNA and nuclear markers is mostly concordant at one contact zone (between S. s. gallaica and S. s. bernardezi), but at another (between S. s. fastuosa and S. s. terrestris) the markers are offset by about 250 km. The observed geographic variation fits a model of mtDNA capture. Among the potential mechanisms responsible for such discordance we favor a combination of range shifts due to climatic fluctuations and biased genetic admixture across moving contact zones. We apply our findings to the issue of possible homoplasy in the evolution of viviparity and conclude that viviparity likely arose only once within S. salamandra.

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“…Pocket gophers of the family Geomyidae are one group of mammals for which this discordance in phyletic relationships based on mtDNA and nuclear genes has been described before (Baker et al 1989;Bradley et al 1991;Jones et al 1995;Patton & Smith 1994). Hybridization between divergent taxa of pocket gophers is common (see Patton 1993 for review), and provides the mechanism and opportunity for horizontal gene transfer.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic evidence of mitochondrial DNA introgression among pocket gophers in New Mexico (family Geomyidae)

1997

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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 from nuclear markers (allozymes) and from mtDNA haplotypes sampled in different populations of T. bottae from New Mexico, we show that apparent similarity is due to an introgression of T. b. ruidosae mtDNA into T. b. actuosus nuclear background. Evidence of introgression is not limited to the present-day contact zone between these two taxa, but extends at least 75 km away from it. The actuosus haplotype coexists along with the ruidosae mtDNA in the Gallinas Mts., which are inhabited by otherwise pure T. b. actuosus, while further north only typical actuosus haplotypes were detected. Of several potential mechanisms which could lead to such a geographical pattern of variation, we argue that a combination of range shifts due to climatic fluctuations, and genetic drift are most likely. Horizontal gene transfers due to hybridization are historical events which seem rather common among pocket gophers. Although they can be identified with careful phylogenetic study using independent data sets, the potential for misinterpreting a gene tree as an organismal tree is great in this and other groups of animals.

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Hybrid Pocket Gophers and Some Thoughts on the Relationship of Natural Hybrids to the Rules of Nomenclature and the Endangered Species Act

Cited by 16 publications

References 30 publications

Geomys bursarius (Rodentia: Geomyidae)

Geomys bursarius (Rodentia: Geomyidae)

Dispersal of Viviparity Across Contact Zones in Iberian Populations of Fire Salamanders (Salamandra) Inferred From Discordance of Genetic and Morphological Traits

Phylogenetic evidence of mitochondrial DNA introgression among pocket gophers in New Mexico (family Geomyidae)

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