| Project/Area Number |
04454031
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | Hokkaido University |
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Principal Investigator |
MAWATARI Shunsuke Hokkaido University, Faculty of Science, Professor, 理学部, 教授 (50096913)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Hisao Ritsumeikan University, Faculty of Science and Technology, Professor, 理工学部, 教授 (40113112)
NAGAO Takashi Hokkaido University, Center for Experimental Animals and Plants, Associate Profe, 実験生物センター, 助教授 (70113595)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1993: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1992: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | Food intake efficiency / L-system / Minimum lengthbetween tentacles / Membranipora serrilamella / Colony growth pattern / Bifurcate budding / Bpronoy polygon / Closest packing structure / コケムシ / 群体成長パタン / 指数関数的増加 / エルシステム / 触手冠間距離 / 個虫 |
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| Research Abstract |
Colony grouth pattern of a cheilostomebyozoan Membranipora serrilamella was mathematically analyzed. Some rules of zooids buddingwere revealed as follows :
(1) The budding type of parent zooid does not so much infruence thebuding type of daughter zooid. This was clarified by the application of the L-systme analysis bsed on probability.
(2) each zooid keeps the maximum distance betrween its own orifice and the orifices of the sorrounding zooids. This resultwas indirectly brought by the present of variation of the zooid length in a colony.
(3) There are sufficient area for tentacle expansion of each zooid whether the zooid is big or small.
(4) Orifices in a colonyare not arranged in closest byt closer packing. This was revealed by the result that the variation range of the area of zooid exceeds that of the area of boronoy polygon.
(5) Each zooid tends to include its tentacle crown a little. This behavior makes the food intake efficiency high.
All of the data obtained by the present stucy consistently tell us that the zooids of a colony of Membranipora serrilamella are reglarly arranged in order to make their food intake efficiency high. This principle for existence can be applied for the study of bryozoan evolution.
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