Phylogeography of the sub-Antarctic notothenioid fish Eleginops maclovinus: evidence of population expansion |
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Authors: | Santiago Guillermo Ceballos Enrique Pablo Lessa Mariela Fernanda Victorio Daniel Alfredo Fernández |
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Institution: | (1) Centro Austral de Investigaciones Cient?ficas (CADIC), Bernardo A. Houssay 200, cp 9410, Ushuaia, Tierra del Fuego, Argentina;(2) Secci?n Evoluci?n, Facultad de Ciencias, Universidad de la Rep?blica, 4225 Igu?, Montevideo, Uruguay |
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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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