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Microsatellite Analysis of Japanese Sea Cucumber, Stichopus (Apostichopus) japonicus, Supports Reproductive Isolation in Color Variants.

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The genetic relationship among the three color variants (Red, Green, and Black) of the Japanese sea cucumber, S. japonicus, was investigated using 11 microsatellite markers. Genetic differentiation testing among the three sympatric color types showed the strong heterogeneity of Red (p < 0.001), while no significant difference was observed between Green and Black (p = 0.301 to 0.961). UPGMA trees constructed from 10 sample lots from 5 localities showed two distinct clusters, one from the Red types and the other from the Green and Black types. In addition, the sympatric Green and Black formed one subcluster with strong bootstrap support at each locality. These results indicate the separate species status of Red and the other color types, and also support the population identity of sympatric Green and Black.

Authored by Kanno M, Suyama Y, Li Q, Kijima A. Laboratory of Integrative Aquatic Biology, Graduate School of Agriculture Science, Tohoku University, Onagawa, Miyagi, 9862242, Japan, a-kijima@mail.cc.tohoku.ac.jp.

Published in Mar Biotechnol (NY). 2006 Nov-Dec;8(6):672-85. Epub 2006 Oct 17. The full report is available online. link   A subscription to the periodical may be required.

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