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Biol Bull 117: 150-153. (August 1959)
© 1959 Marine Biological Laboratory
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SOME EFFECTS OF TEMPERATURE ON DEVELOPMENT IN THE SEA URCHIN ALLOCENTROTUS FRAGILIS

A. R. MOORE 1

1 Hopkins Marine Station of Stanford University, Pacific Grove, California

1. The eggs of the deep water sea urchin Allocentrotus fragilis develop normally to plutei under laboratory conditions at 7°-15° C.

2. At the higher temperature of 20° C. cytoplasmic division fails but the nuclei show characteristic mitotic figures.

3. The sperm nucleus of Allocentrotus fragilis functions normally at higher temperatures in the eggs of Strongylocentrotus purpuratus and Dendraster excentricus.

4. Blastulae and gastrulae of Allocentrotus fragilis brought to a temperature of 20° C., which is lethal for the eggs and early division stages, develop into plutei of reduced size.

5. It is suggested that in the advanced larvae hardiness to the higher temperature is the result of the intimate association of nucleus and cytoplasm in the minute cells, and the synthesis of structural elements and processes at the lower temperature.






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Copyright © 1959 by the Marine Biological Laboratory.