| Project/Area Number |
03640625
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
動物形態・分類学
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| Research Institution | Chiba University |
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Principal Investigator |
HIRANO Yoshiaki CHIBA UNIV. FAC. SCI. RESEARCH ASSOCIATE., 理学部, 助手 (00144808)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1992: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Japan / Nudibranchs / Molluscs / Taxonomy / Variation / Veliger larvae / Biogeography / 色彩変異 / ヴェリジャ-幼生 / 同胞種 |
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| Research Abstract |
Collections of materials were made at various localities in Japan, and close observations of both external and internal (reproductive systems) morphology were done on the specimens. Taxonomic works were achieved especially on the species of suborder Aeolidacea. By careful analysis of morphological variation, some cryptic species were discovered. One of the most interesting aspects revealed by this project is that the cryptic species often occur sympatrically showing some different ecological features. In order to perform further ecological works, identification of the species in pediveliger stage was attempted, and it became possible in several species.
In addition to several new species, many species which had not known in Japan were discovered through this project. Distributional features were studied for these species, and it was suggested that human activities such as shipping may affect the dispersion of some species which lack long planktonic phase in their life history.
Studies for re-evaluation of the systematics in higher taxa and review of the phylogeny are now carrying out. More careful observations of the internal morphology are necessary before the completion of the work.
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