Allozyme and colour differences between two sibling species of the heteronemertean Lineus torquatus from the Sea of Japan |
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Authors: | G P Manchenko V I Kulikova |
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Institution: | (1) Institute of Marine Biology, 690041 Vladivostok, Russia;(2) Institute of Evolutionary Morphology and Ecology of Animals, 13071 Moscow, Russia |
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Abstract: | Brown and cherry colour morphs of the heteronemertean Lineus torquatus Coe, 1901 from the Vostok Bay of the Sea of Japan were compared using allele frequencies at 18 isozyme loci. These morphs shared no common alleles at 9 of the 18 loci. The observed genetic differences are strong evidence that the brown and cherry colour morphs, which occur sympatrically, are different species. Nei's genetic distance between these species (D=1.135) is considerably higher than typical D values for congeneric animal species. As with much previous work on nemerteans, intraspecific allozymic variability in both species was high, with mean expected heterozygosity values 0.286±0.049 and 0.159±0.051 for L. torquatus (brown) and L. torquatus (cherry) species, respectively. |
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