Phylogeography of the sub-Antarctic notothenioid fish Eleginops maclovinus: evidence of population expansion
Ceballos, S.G.; Lessa, E.P.; Victoria, M.F.; Fernández, D.A. (2012). Phylogeography of the sub-Antarctic notothenioid fish Eleginops maclovinus: evidence of population expansion. Mar. Biol. (Berl.) 159(3): 499-505. http://dx.doi.org/10.1007/s00227-011-1830-4
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, meer
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| Auteurs | | Top |
- Ceballos, S.G.
- Lessa, E.P.
- Victoria, M.F.
- Fernández, D.A.
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| Abstract |
Phylogeography studies add insights into the geographic and evolutionary processes that underline the genetic divergence of populations. This work examines the geographic genetic structure of the Patagonian blennie, Eleginops maclovinus, a notothenioid (Perciformes) endemic to South American temperate and sub-Antarctic waters, using mitochondrial DNA cytochrome b sequences. We found 58 haplotypes in the analysis of 261 individual sequences of 833 base pairs in length. Among-population variance was very low (1.62%) and many haplotypes were shared between several populations across the species geographic range. Genetic differentiation was not consistent with a simple model of isolation by distance, possibly suggesting a lack of equilibrium between gene flow and local genetic drift. The analysis of mismatch distributions, neutrality tests, and the Bayesian Skyline Plot showed a pattern consistent with a recent population expansion event that may have taken place during the Middle Pleistocene. |
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