GENETIC VARIATION IN THE AFRICAN VLEI RAT OTOMYS IRRORATUS (MURIDAE: OTOMYINAE)
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Starch gel electrophoresis was used to analyse genetic variation at 24 enzyme and protein loci in 12 South African populations of vlei rats Otomys irroratus. Mean heterozygosity (H: 0.071) was relatively high for a mammal. Allelic variation within populations conformed to Hardy-Weinberg expectations, and the mean value for Wright's FIS statistic (0.048) indicated no evidence of inbreeding within populations. There was significant local differentiation in allelic frequencies (Wright's FST = 0.375). However, genetic distances between populations were low (mean for Nei's D = 0.034), and cluster analysis of genetic distances failed to identify groups consistent with geographical position or karyotypic differences between populations. A single population (Hogsback, eastern Cape), bearing a chromosomal tandem fusion and demonstrating a high measure of reproductive isolation, showed no allozymic differences from other populations, suggesting that chromosomally-mediated speciation may precede phenotypic and genie divergence. However, the population genetic structure of O. irroratus was not consistent with the conditions required for amodel of speciation by chromosomal transilience (i.e., stasipatric speciation of White).
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GENETIC VARIATION IN THE AFRICAN VLEI RAT OTOMYS IRRORATUS (MURIDAE: OTOMYINAE)
In: Israel Journal of Ecology and EvolutionSearch for other papers by P. J. TAYLOR in
Current site
Google Scholar
PubMed
Search for other papers by G. K. CAMPBELL in
Current site
Google Scholar
PubMed
Search for other papers by D. VAN DYK in
Current site
Google Scholar
PubMed
Search for other papers by J. MEESTER in
Current site
Google Scholar
PubMed
Search for other papers by K. WILLAN in
Current site
Google Scholar
PubMed
Starch gel electrophoresis was used to analyse genetic variation at 24 enzyme and protein loci in 12 South African populations of vlei rats Otomys irroratus. Mean heterozygosity (H: 0.071) was relatively high for a mammal. Allelic variation within populations conformed to Hardy-Weinberg expectations, and the mean value for Wright's FIS statistic (0.048) indicated no evidence of inbreeding within populations. There was significant local differentiation in allelic frequencies (Wright's FST = 0.375). However, genetic distances between populations were low (mean for Nei's D = 0.034), and cluster analysis of genetic distances failed to identify groups consistent with geographical position or karyotypic differences between populations. A single population (Hogsback, eastern Cape), bearing a chromosomal tandem fusion and demonstrating a high measure of reproductive isolation, showed no allozymic differences from other populations, suggesting that chromosomally-mediated speciation may precede phenotypic and genie divergence. However, the population genetic structure of O. irroratus was not consistent with the conditions required for amodel of speciation by chromosomal transilience (i.e., stasipatric speciation of White).
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 194 | 58 | 12 |
| Full Text Views | 12 | 1 | 0 |
| PDF Views & Downloads | 6 | 2 | 0 |
