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| Islands on the plains: metapopulation dynamics and female biased dispersal in hyraxes (Hyracoidea) in the Serengeti National Park. Gabriele Gerlach and Hendrik N. Hoeck Molecular Ecology 10 (2001) 2307 – 2317 Two species of hyrax, Heterohyrax brucei and Procavia johnstoni, inhabit rock outcrops, or kopjes, in the Serengeti National Park, Tanzania. Such distinct 'island' habitats provide an excellent model to investigate natural metapopulation dynamics with distinct small populations with extinction and colonisation events as well as migration between populations. Allele frequencies, genetic variability, and genetic distances between populations were calculated based on DNA microsatellite markers. The genetic diversity in both species of hyrax, especially P. johnstoni, was surprisingly low: allelic diversity ranged from 2 to 7 alleles per locus. This might have been induced by colonisation by a small number of individuals from single source populations. F-statistics, assignment tests and calculations of pairwise relatedness all indicated female-biased dispersal in H. brucei but not in P. johnstoni. FIS-values in P. johnstoni showed excess of homozygotes indicative of high rates of inbreeding; evidence for inbreeding could not be detected in H. brucei. While female dispersal patterns in H. brucei seem to prevent inbreeding and consequently reduce risk of local extinction, this seems not to be the case in P. johnstoni. Characterization and isolation of DNA microsatellite primers in hyrax (Hyracoidea) in the Serengeti National Park. Gabriele Gerlach, Henry Derschum, Yvonne Martin and Henner Brinkmann Molecular Ecology 9 (2000) 1675 – 1677 |
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