Molecular divergence and speciation of Baikal oilfish (Comephoridae): facts and hypotheses.

Autor: Teterina VI; Limnological Institute, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia. veronika@lin.irk.ru, Sukhanova LV, Kirilchik SV
Jazyk: angličtina
Zdroj: Molecular phylogenetics and evolution [Mol Phylogenet Evol] 2010 Jul; Vol. 56 (1), pp. 336-42. Date of Electronic Publication: 2010 Apr 09.
DOI: 10.1016/j.ympev.2010.04.001
Abstrakt: Sympatric speciation was studied in two sister species of cottoid fish from Lake Baikal (East Siberia): big golomyanka or Big Baikal oilfish (Comephorus baicalensis Pallas, 1776) and small golomyanka or Little Baikal oilfish (C. dybowski Korotneff, 1905). Analysis of nucleotide sequences of mitochondrial cytochrome b gene showed that the Little Baikal oilfish (LBO) formed a single population in the lake, whereas the Big Baikal oilfish (BBO) was divided into two genetic groups - BBOI and BBOII, which were not separated geographically. Phylogenetic analysis showed that BBO is a more ancient species than LBO and that the paraphyletic origin of LBO is from the BBO genetic lineage within the genus Comephorus. Population-genetic structure and phylogenetic relationships between the two golomyanka species are considered to be a consequence of paleoenvironmental events that took place in the Baikal region during the past hundreds of thousand years.
(Copyright 2010 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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