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A Study of Metric characters for Bryozoan Taxonomy

Research Project

Project/Area Number 06640891
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 系統・分類
Research InstitutionHokkaido University

Principal Investigator

MAWATARI Shunsuke  Hokkaido University, Graduate School of Science, Professor, 大学院理学研究科, 教授 (50096913)

Co-Investigator(Kenkyū-buntansha) NAKAJIMA Hisao  Ritsumeikan University, Faculty of Science and Technology, Professor, 理工学部, 教授 (40113112)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Keywordsheterozooids / colony defense / food intake efficiency / Membranipora serrilamella / Colony growth pattern / bifurcate budding / Thalamoporella rozieri / Microporella species / 採餌効率 / 二分岐出芽 / 群体成長パターン / 計測形質 / 個体成長モデル / オートマトン / 個体間相互作用 / Lindenmayer System
Research Abstract

Colony growth pattern is compared between the two cheilostome bryozoans Membranipora serrilamella and Thalamoporella rozieri. Some rules of zooids budding were revealed to be different between the two species as follows :
(1) Increasing rates of both single and twin zooids according to the area expanding of colony are similar between the two species.
(2) The timing of bifurcation of zooid row is strongly correlated with the width of zooid in both species. In other words, there is a critical threshold of zooid width between the single and twin zooids.
(3) In the colonies of Thalamoporella rozieri, aproximately 9 % of zooid rows come to an end before the colony edge, while 0 % in Membranipora serrilamella. This is caused by the more frequent bifurcation in the former than in the latter.
(4) Nearly 12 % of the zooids in a colony of Membranipora serrilamella are twins while aproximately 18 % in Thalamoporella rozieri.
(5) The zooid width is not correlated with the development of heterozooids. The frequency of heterozooids increases in colony edge.
All of the data obtained by the present study consistently tell us that the zooids of a colony of Membranipora serrilamella are regularly arranged in order to make their food intake efficiency high. This principle for existence, however, can not be directly applied for Thalamoporella rozieri. It is concluded that the defense of colony performed by heterozooids evolutionally decreases the efficiency of hood intake.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Shunsuke Mawatari, Tsuyoshi Suwa: "A taxonomic study of Microporella species(Bryozoa,Cheilostomata)from Japan" SPECIES DIVERSITY. 2. 22-35 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Shunsuke Mawatari, Hiromi Ikezawa: "Three new species of Celleporina(Bryozoa Cheilostomata)from Hokkaido,Japan" Journal of Natural History. 31. 33-49 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mawatari, S.and Suwa T.: "A taxonomic study of Microporella species (Bryozoa, cheilostomata) from Japan" Species Diversity. Vol.2No.1. 22-35 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mawatari, S.and Ikezawa H.: "Three new species of Celleporina (Bryozoa : Cheilostomata) from Hokkaido, Japan" Journal of Natural History. Vol.31. 33-49 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 前田卓哉,中島久男,馬渡峻輔: "コケムシ平面群体パターン形成の数理的解析" 数理生物学懇談会ニュースレター. 17. 20- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Suwa,T.& Mawatari,S.F.: "Microporella(Bvyozoa,Cheilostowata)from Hokkaido,Japan" Specie Diversity. 1. 54-68 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 池澤 広美・馬渡 峻輔: "幼生とその変態および群体発生に着目したコブコケムシ層(Glleporina)の系統分類" 海洋と生物. 16. 519-524 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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