Molecular divergence and speciation of Baikal oilfish (Comephoridae): facts and hypotheses.
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.
Teterina
Veronika I
VI
Limnological Institute, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia. veronika@lin.irk.ru
Sukhanova
Lubov V
LV
Kirilchik
Sergey V
SV
D000818:Animals; D001499:Bayes Theorem; D045303:Cytochromes b / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics; D019143:Evolution, Molecular; D005399:Fishes / Q000145:classification / Q000235:genetics*; D050259:Genes, Mitochondrial; D049810:Genetic Speciation; D014644:Genetic Variation; D005828:Genetics, Population; D008957:Models, Genetic; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013045:Species Specificity
D004272:DNA, Mitochondrial; D045303:Cytochromes b