Sexual differences in gonad size and color of strongylocentrotus nudus and hemicentrotus puicherrimus (echinoidea: Echinodermata), from maturation to post-spawning in sargassum yezoense bed (phaeophyceae: Heterokontophyta)

Junji Kinoshita, Hikaru Endo, Yukio Agatsuma

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

To elucidate sexual differences in gonad size and color in sympatric two sea urchins (Strongylocentrotus nudus and Hemicentrotus puicherrimus), we examined S. nudus and H. puicherrimus with gametes in the gonads, in the Sargassum yezoense bed in the Oshika Peninsula, northern Honshu, Japan during July-November and September-June, respectively, from 2008 to 2010. The changes in the gonad indices of H. pulcherrimus in the Sargassum bed were compared with those in the Undaria pinnatIda and Saccharinajaponica kelp bed, using a data set obtained from Ogasawara et al. (2011). The gonad indices, by sex, of S. nudus rapidly decreased from September to a minimum in November, while those of H. pulcherrimus decreased from October to a minimum in December, February or April. For both species of sea urchin, the proportion of brown-colored gonads increased with a decrease in the gonad indices during spawning. A significant positive correlation between brown-colorization and gonad size was also detected. In H. pulcherrimus, the female gonad size was smaller than that of males during the spawning stage in both the Sargassum bed and the kelp bed. Gonadal regrowth of females during post-spawning was much slower in the Sargassum bed.

Original languageEnglish
Pages (from-to)633-639
Number of pages7
JournalCahiers de Biologie Marine
Volume54
Issue number4
Publication statusPublished - 2013 Nov 29

Keywords

  • Gonad color
  • Gonad size
  • Hem icentrotus puicherrimus
  • Sargassum bed
  • Sexual difference
  • Strongylocentrotus nudus

ASJC Scopus subject areas

  • Aquatic Science

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