Three species of sea urchin, Hemicentrotus puicherrimus, Anthocidaris crassispina, and Hemicen trotus depressus, inhabit the tidal areas around the Mi saki Marine Biological Station, on the Pacific coast of Japan. These sea urchins have different breeding seasons and hence their embryos show differences in tempera ture sensitivity. In this study, differences in the tempera ture dependence oftheir embryogenesis were examined. It was found that the upper and lower limits of the opti mal temperature range for embryogenesis in each animal were species-specifically determined, and that the range ofseawater temperature during the breeding season was within this optimal temperature range. A quasi-linear re lationship was obtained between temperature and rela tive developmental velocity, which was defined as the ra tio against the maximal velocity attained at the highest temperature within the optimal temperature range. Based on this result, a form ofgraphical analysis was de vised to represent the differences in species-specific de velopmental temperature sensitivity. The physiological and ecological significance of species-specific tempera ture sensitivity was also discussed.
Differences in Temperature Dependence of Early Development of Sea Urchins with Different Growing Seasons
Published 1989 in The Biological Bulletin
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- Publication year
1989
- Venue
The Biological Bulletin
- Publication date
1989-04-01
- Fields of study
Biology, Environmental Science
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Semantic Scholar
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