Diurnal periodicity of the squirting of Holocynthia roretzi

Satoshi Katayama, Nagahira Arai, Keishiro Karita, Gen Ichi Hoshiai, Zen Ichiro Hoshino

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In order to make clear the physiological ecology of squirting exhibited by Halocynthia roretzi, we examined the periodicity of squirting and the factor on the periodicity through the experiment measuring the internal pressure. On the natural condition, the small squirting showed an obvious periodicity of 24 hours cycle, and the large one displayed a weak periodicity for one of four specimens. However, ascidians had no rhythms of squirting in the dark. On 8L8D condition, we found a periodicity of approximately 16 h in small squirting. These results suggest that the periodicity of squirting does not depend on the biological clock, but attributes to increase of the small squirting due to their responses for the light.

Original languageEnglish
Pages (from-to)650-654
Number of pages5
JournalNippon Suisan Gakkaishi (Japanese Edition)
Issue number4
Publication statusPublished - 1999 Jul

ASJC Scopus subject areas

  • Aquatic Science


Dive into the research topics of 'Diurnal periodicity of the squirting of Holocynthia roretzi'. Together they form a unique fingerprint.

Cite this