POST-ZYGOTIC REPRODUCTIVE ISOLATION IN THE AFRICAN VLEI RAT OTOMYS IRRORATUS (MURIDAE: OTOMYINAE)
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Post-zygotic reproductive isolating mechanisms among three chromosomally distinct, allopatric populations (Committee's Drift, Hogsback, Karkloof) of the vlei rat Otomys irroratus (Brants, 1827) were studied by means of laboratory breeding trials. Data from intrapopulation pairings, all of which produced young, provided a baseline for assessment of the reproductive performance of interpopulation, backcross, and hybrid cross pairings. Although 83.3% of interpopulation cross pairings produced young, overall reproductive success tended to be impaired: progeny of both the Committee's Drift × Hogsback and Committee's Drift × Karkloof pairings experienced increased pre-weaning mortality, while the tertiary (weaning) sex ratio of Committee's Drift × Karkloof hybrids (10: 24) significantly favored females. Backcross and hybrid cross breeding were severely impaired: respectively, 26.4% and 11.1 % of pairs produced litters, and almost all of the Hogsback-cross hybrids that survived to sexual maturity were sterile. All successful backcross and hybrid cross matings resulted in reduced litter size, and most displayed increased pre-weaning mortality. These results appear to indicate the existence of genetic or chromosomal incompatibility among the three populations. The almost complete sterility of the Hogsback-cross hybrids, which may be due to the presence of a tandem fusion identified in the Hogsback karyotype, suggests that this population is a chromosomally-determined incipient sibling species.
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POST-ZYGOTIC REPRODUCTIVE ISOLATION IN THE AFRICAN VLEI RAT OTOMYS IRRORATUS (MURIDAE: OTOMYINAE)
In: Israel Journal of Ecology and EvolutionSearch for other papers by N. PILLAY in
Current site
Google Scholar
PubMed
Search for other papers by K. WILIAN in
Current site
Google Scholar
PubMed
Search for other papers by J. MEESTER in
Current site
Google Scholar
PubMed
Post-zygotic reproductive isolating mechanisms among three chromosomally distinct, allopatric populations (Committee's Drift, Hogsback, Karkloof) of the vlei rat Otomys irroratus (Brants, 1827) were studied by means of laboratory breeding trials. Data from intrapopulation pairings, all of which produced young, provided a baseline for assessment of the reproductive performance of interpopulation, backcross, and hybrid cross pairings. Although 83.3% of interpopulation cross pairings produced young, overall reproductive success tended to be impaired: progeny of both the Committee's Drift × Hogsback and Committee's Drift × Karkloof pairings experienced increased pre-weaning mortality, while the tertiary (weaning) sex ratio of Committee's Drift × Karkloof hybrids (10: 24) significantly favored females. Backcross and hybrid cross breeding were severely impaired: respectively, 26.4% and 11.1 % of pairs produced litters, and almost all of the Hogsback-cross hybrids that survived to sexual maturity were sterile. All successful backcross and hybrid cross matings resulted in reduced litter size, and most displayed increased pre-weaning mortality. These results appear to indicate the existence of genetic or chromosomal incompatibility among the three populations. The almost complete sterility of the Hogsback-cross hybrids, which may be due to the presence of a tandem fusion identified in the Hogsback karyotype, suggests that this population is a chromosomally-determined incipient sibling species.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 189 | 64 | 10 |
| Full Text Views | 14 | 0 | 0 |
| PDF Views & Downloads | 8 | 0 | 0 |
