潮汐干潟の二枚貝群集を決定する後着底過程

J-STAGE 参考文献27件
  • 関口 秀夫
    Department of Fisheries, Faculty of Bioresources, Mie University
  • 内田 径孝
    Department of Fisheries, Faculty of Bioresources, Mie University
  • 酒井 明久
    Department of Fisheries, Faculty of Bioresources, Mie University

書誌事項

タイトル別名
  • Post-Settlement Processes Determining the Features of Bivalve Assemblages in Tidal Flats

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抄録

河口が隣接しているにもかかわらず,2つの河川のそれぞれの河口干潟の二枚貝類群集,とくにその主要種は著しく異なっていた.これらの河口干潟の主要種3種類(イソシジミガイ,アサリ,ホトトギスガイ)の浮遊幼生,着底稚貝r稚貝および稚貝大型個体の4年間にわたる調査結果をもとに,両河川の河口干潟の二枚貝類群集の特徴あるいは相違が幼生の着底以前に決定されているのか,あるいは着底以降に決定されているのかを調べた.両河口干潟の二枚貝類群集の相違は,大体において,幼生の着底以降の諸過程,特に大型個体(殻長1.0mm以上)に成長以降に生じていた.しかし,年によっては,幼生の着底直後(殻長0.3mm未満)に,あるいは稚貝(殻長0.3mm以上,1.0mm未満)の段階で,この相違が生ずることもあった.
The mouths of two rivers in Japan, the Ano and the Shitomo, are adjacent to each other but show a marked difference in their bivalve assemblages on the tidal flats. From the results of a four-year field investigation on the densities of larvae and recruitants of three dominant bivalves (Nuttallia olivacea, Ruditapes philippinarum, Musculista senhousia), we sought to see whether pre- or post-settlement processes are the important factors determining the features of the bivalve assemblages in each river. They were found to be determined basically by post-settlement processes. However, in some years, they were determined after larval recruitment (>1.0mm in shell length), and in other years immediately after the larvae had settled on the tidal flats or after the bivalves had reached a certain size but before larval recruitment.

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