Molecular Evidence of the Existence of Two Sibling Species within the Echinothurioid Echinoid Asthenosoma ijimai from Japanese Waters(Phylogeny)
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概要
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The echinoid, Asthenosoma ijimai belonging to the order Echinothurioida from Japamese waters shows the geographical variation in morphological and ecological characters. The echinothurioid from Ryukyu Islands in southern Japan is clearly different from that of Sagami Bay and Suruga Bay in the middle part of Japan at non-molecular level. Their phylogenetic and taxonomic relationships were studied at the molecular level by allozyme analysis. The results demonstrated that the two echinothurioids from Ryukyu Islands and Sagami Bay do not share gene pools with each other, and they were fixed for different alleles at five genetic loci (Mdh, G6pd, Po, Alk-3 and Est-7) in a total of 23 enzyme genetic loci scored. This indicates no gene flow between the two echinothurioids, and is a molecular evidence for that they are reproductively isolated and genetically distinct species. The Nei's genetic distance (D=0.181) between the two were significantly higher than those between conspecific local populations, and comparable to those between closely related species in many other animals containing echinoderms. The present molecular data are well consistent with the non-molecular evidence from morphology, developmental biology and ecology. Putting these data together, we propose that the two echinothurioids should be classified as two sibling species of the genus Asthenosoma and would like to give the following scientific names: the echinothurioid species from Sagami Bay is Asthenosoma ijimai and that from Ryukyu Islands is A. ijimai R.
- 社団法人日本動物学会の論文
- 2004-10-25
著者
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Amemiya Shonan
Department Of Integrated Biosciences Graduate School Of Frontier Sciences The University Of Tokyo
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Amemiya Shonan
Department Of Biological Sciences And Misaki Marine Biological Station University Of Tokyo
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Kohyama Kuniko
Graduate School Of Science Hirosaki University
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Matsuoka Norimasa
Division Of Molecular Evolution Faculty Of Agriculture & Life Science Hirosaki University
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Arakawa Emi
Department of Zoology, Faculty of Science, the University of Tokyo
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Arakawa Emi
Department Of Zoology Faculty Of Science The University Of Tokyo
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Amemiya Shonan
Department Integrated Biosciences Graduate School Of Frontier Sciences University Of Tokyo
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