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Intraspecific phylogeography of the Cape galaxias from South Africa: evidence from mitochondrial DNA sequences
journal contribution
posted on 2023-05-16, 10:44 authored by Waters, JM, Cambray, JAMitochondrial cytochrome b gene sequences were obtained from representatives of five populations of the Cape galaxias Galaxias zebratus. Four highly distinct genotypes were revealed, with sequence divergence values ranging from 5.8 to 13.8%. Some of the pairwise divergences are the highest yet reported for cytochrome b within a fish species, and are more typical of interspecific and intergeneric comparisons. In contrast, the low genetic divergence (0.3%) between two recently recorded populations from the Krom and Gamtoos (Kouga) Rivers indicates recent gene flow. Parsimony analysis consistently produced a tree with the population from the Olifants River on the west coast as ancestral and eastern populations as progressively more derived. Estimated divergence times for the Olifants population range from 4.4 to 6.6 million years ago. The findings suggest that another detailed revision is required to determine whether these divergent populations represent a single species or a species complex.
History
Publication title
Journal of Fish BiologyVolume
50Issue
6Pagination
1329-1338ISSN
0022-1112Department/School
School of Natural SciencesPublisher
The Fisheries Society of the British IslesPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRepository Status
- Restricted