Molecular Evidence for the Existence of Four Sibling Species within the Sea-Urchin, Echinometra mathaeiin Japanese Waters and their Evolutionary Relationships(Taxonomy and Systematics)
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概要
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Four different types of the sea-urchin, Echinometra mathaei (Blainville) which are distinguishable by several characters such as color pattern of spines are observed abundantly on Okinawan reef flats, southern Japan. Their taxonomic, genetic and evolutionary relationships were examined by enzyme electrophoresis. The allozyme studies demonstrated that the four types of sea-urchins designated as Types A, B, C and D do not share gene pools with each other in spite of their sympatric distribution. They were fixed for different alleles at 7 genetic loci in a total of 28 genetic loci scored. This clearly shows no gene flow between the four types, and is a strong evidence for that they are reproductively isolated and genetically distinct species. The Nei's genetic distances between the four types were significantly higher than those between conspecific local populations, and comparable to those between incipient species or very closely related species in many other animal groups. We therefore propose that these four types of sea-urchins should be classified as distinct and separate species of the genus Echinometra. The molecular phylogenetic tree constructed on the basis of the Nei's genetic distances revealed the close affinities between Types A and C and between Types B and D. It also showed a large genetic differentiation between Types A and B. The phylogenetic tree suggested that the four types speciated in relatively recent geological age of the middle Pleistocene. The speciation process of the four types is also discussed.
- 社団法人日本動物学会の論文
- 1991-02-15
著者
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Matsuoka Norimasa
Department Of Biofunctional Science Faculty Of Agriculture And Life Science Hirosaki University
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HATANAKA Toshihiko
Department of Biofunctional Science, Faculty of Agriculture and Life Science, Hirosaki University
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Hatanaka Toshihiko
Department Of Biofunctional Science Faculty Of Agriculture And Life Science Hirosaki University
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Hatanaka Toshihiko
Department Of Biology Faculty Of Science Hirosaki University
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