Distribution of the sea urchin Hemicentrotus pulcherrimus along a shallow bathymetric gradient in Onagawa Bay in northern Honshu, Japan

Yukio Agatsuma, Hirokazu Yamada, Kazuya Taniguchi

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Distribution of the sea urchin Hemicentrotus pulcherrimus was monitored monthly or bimonthly from April 1998 to May 1999 at a 100 m2 permanent site in intertidal to subtidal zones at depths of up to 2.8 m in Onagawa Bay, northern Honshu, Japan. Factors causing seasonal demographic changes were analyzed from vertical algal vegetation, sea urchin size, gonad development, and gut content. The highest density of H. pulcherrimus was found on algal turf on boulders at the depth of 0-0.3 m. Migration of adult sea urchins on crustose corallines at the depth of 0.3-2.8 m to the algal turf and subsequent inhabitation in more suitable boulder habitat are suggested from November to March, when Acrosorium polyneurum, which is their main food, grew dominantly. As the high gut content of crustose coralline of the sea urchins on crustose corallines resulted in significantly lower gonad indices, it is likely that migration is caused by their high foraging activity for A. polyneurum to ensure gonad development. The growth of the sea urchins on algal turf was ensured by Chondrus spp. as main food.

Original languageEnglish
Pages (from-to)1027-1036
Number of pages10
JournalJournal of Shellfish Research
Volume25
Issue number3
DOIs
Publication statusPublished - 2006 Dec

Keywords

  • Acrosorium polyneurum
  • Distribution
  • Gonad development
  • Gut content
  • Hemicentrotus pulcherrimus
  • Migration
  • Sea urchin

ASJC Scopus subject areas

  • Aquatic Science

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