Is the morphological evolution of Microporella correlated with environmental factors?
Grant-in-Aid for Scientific Research (C).
|Research Institution||Hokkaido University|
MAWATARI Shunsuke Hokkaido University, Grad.School of Sci., Prof., 大学院・理学研究科, 教授 (50096913)
|Project Fiscal Year
1998 – 2000
Completed(Fiscal Year 2000)
|Budget Amount *help
¥2,400,000 (Direct Cost : ¥2,400,000)
Fiscal Year 2000 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1999 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1998 : ¥1,000,000 (Direct Cost : ¥1,000,000)
|Keywords||Microporella / morphological evolution / environmental facters / avicularia / attached material / Doderlein / function of zooid accessaries / individual zooids / ウスコケムシ / 形態進化 / 環境要因 / 鳥頭体 / 付着物 / デーデルライン / 機能 / 個虫 / 仮面形卵室 / 相同形質 / 調整嚢囗 / 卵室 / ウスコケムシ属 / 仮面型卵室 / ロンドン自然史博物館 / 微生物マット|
Microporella specimens colleted from three Japanese coastal regions influenced by warm, cold, and warm and cold current and those from Showa Emperor Collection, from Doderlein Collection, and from the collection deposited in the Natural History Museum, London were compared in terms of adaptation to environment.
Three years research yielded the following results :
(1) Morphological variation of avicularia between the species of Microporella generally correlated with the environment in which the particular species live.
(2) Morphology of avicularia means adaptation to the environment.
(2) Hence, it is ill-suited for phylogenetic implication to analyze the relation between the species of Microporella using the morphological comparison of avicularian mandibles.
(4) The tendency described above was discovered in Microporella but is not necessarily expected to be present in other bryozoan groups that have long avicularian mandibles.
(5) The function of avicularian mandible may differ between the species even in a genus or a species group.
All of the data obtained by the present study consistently tell us that the morphology of zooid accessories, such as avicularia, ovicells, frontal umbo, and so on is correlated with environmental conditions, and so you have to compare them with attention particularly for applying a cladistic analysis for the phylogeny concerned.
Research Output (13results)