Genetic evidence for two sibling species within Polydora cf. ciliata (Polychaeta: Spionidae) from the Sea of Japan |
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Authors: | G P Manchenko V I Radashevsky |
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Institution: | (1) Institute of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok 690041, Russia, RU |
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Abstract: | Two morphologically indistinguishable but genetically very distinct polychaete species of the family Spionidae are found
in the Peter the Great Bay of the Sea of Japan. Both species bore into molluscan shells and occur sympatrically. They are
close in morphology to Polydora ciliata (Johnston, 1838) and some other members of the redefined P. ciliata species complex. The systematics of the two species is still under consideration by one of us (V.I.R.). A total of nine enzyme
systems comprising 12 isozyme loci were examined in both the species by means of starch gel electrophoresis. Nei's genetic
distance between them proved surprisingly high (D= 1.942) being the highest among estimates so far obtained for pairs of polydorid species. The levels of intraspecific genetic
variation in both species (Polydora sp. 1, H
e= 0.287 ± 0.064; Polydora sp. 2, H
e= 0.111 ± 0.045) are comparable to those of other electrophoretically studied polydorids. The problem of taxonomic integrity
of cosmopolitan marine invertebrate species is briefly discussed as well as the usefulness of isozymes as species-specific
characters suitable for unequivocal discrimination between sibling polydorid species. A list of enzymes characterized by interspecifically
variable numbers of expressed isozymes within polydorids is given and recommended for such a discrimination.
Received: 22 July 1997 / Accepted: 19 February 1998 |
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