Distribution Patterns of Polychaetous Annelids in an Estuary

  • HONDA Hitoshi
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University
  • CHIBA Toshihiro
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University
  • ITO Kinuko
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University
  • KATAYAMA Satoshi
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University
  • CHIDA Yoshio
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University
  • OMORI Michio
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University
  • OKATA Akihiro
    Department of Applied Bio-Sciences, Faculty of Agriculture, Tohoku University

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Other Title
  • 河口汽水域における多毛類の分布様式
  • カコウ キスイイキ ニ オケル タモウルイ ノ ブンプ ヨウシキ

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Abstract

Polychaetous annelids are the most dominant macrobenthos in an estuary, Hiroura lagoon, Miyagi Prefecture, Japan. The most abundant species in a polychaete assemblage of Hiroura consists of Notomastus sp. Okuda,Neanthes japonica(Izuka), and Prionospio japonicaOkuda. A dense population of polychaete worms provides large food resollrces for fish inhabiting Hiroura. However, field studies revealed that the abundance of the various species showed spatial and temporal fluctuations. Combined biological and environmental factors affect the seasonal changes in abundance of polychaetes. Polychaete life history traits including reproductive patterns are main factors influencing species' population dynamics.

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