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  • 1
    Electronic Resource
    Electronic Resource
    Relationships of the chromosomal species in the eurasian mole rats of theSpalax ehrenbergi group as determined by DNA-DNA hybridization, and an estimate of the spalacid-murid divergence time (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 223-232 
    Details
    ISSN: 1432-1432
    Keywords: Spalax speciation ; Rate of DNA change ; Rodent phylogeny ; DNA hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary DNA-DNA hybridization was used to measure the average genomic divergence among the four chromosomal species of the Eurasian mole rats belonging to theSpalax ehrenbergi complex (Rodentia: Spalacidae). The percent nucleotide substitutions in the single-copy nuclear DNA among the species ranged from 0 to 5%, suggesting that speciation has occurred with minor genomic changes in these animals. The youngest chromosomal species appear to differ by 0.2–0.6% base pair mismatch, which is only between one and three base differences in a 500-bp fragment. The interspecific values of percent nucleotide differences permit the recognition of two well-separated speciation events in theS. ehrenbergi complex, the older (of Lower Pleistocene age) having isolated the chromosomal species 2n=54 before the divergence of the three other species. DNA-DNA hybridization was also used to compare the Spalacinae (Eurasian mole rats), Murinae (Old World rats and mice), and Arvicolinae (voles and lemmings). These data enabled us to estimate the time of divergence of the spalacids at ca. 19 million years ago. The dates of divergence among the other rodent lineages, as predicted by DNA hybridization results, agree well with paleontological data. These dates of divergence are obtained by the relation between geological time and single-copy nuclear DNA change, a relation that was calibrated by Catzeflis et al. (1987) through the use of fossil Arvicolinae and Murinae data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100206
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular evolutionary relationships of three genera of nesomyinae, endemic rodent taxa from madagascar (1996)
    Springer
    Journal of mammalian evolution 3 (1996), S. 239-260 
    Details
    ISSN: 1573-7055
    Keywords: Nesomyinae ; Muroidea ; 12S rDNA ; Madagascar ; DNA hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships of Nesomyinae, a group of murid rodents endemic to the island of Madagascar, were investigated with two comparative molecular approaches. Compared to those of other muroid rodents representing Murinae, Cricetinae, Cricetomyinae. Arvicolinae, and Sigmodontinae, complete sequences of the 12S rRNA mitochondrial gene suggest that the Malagasy nesomyinesMacrotarsomys andNesomys are monophyletic and that their sister-group among the taxa analyzed isCricetomys. A limited series of DNA/DNA hybridization experiments extends these observations to a third nesomyine genus,Eliurus, and a second cricetomyine taxon,Saccostomus. By relating the amounts of overall genomic divergence with geological time as calibrated by theMus/Rattus dichotomy estimated at 12–14 My, the oldest within-Nesomyinae dichotomy is estimated to be 10.8 to 12.6 My. Thus, these three genera of Malagasy nesomyine rodents appear to be a rather ancient offshoot from African ancestors whose Recent relatives are Cricetomyinae. This preliminary observation should be confirmed by sampling additional genera of nesomyines and additional representatives for other subfamilies of African muroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458182
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    Paper (German National Licenses)
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