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Biol Bull 122: 391-395. (June 1962)
© 1962 Marine Biological Laboratory
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THE EXTENSION OF FERTILIZABILITY AND A HYPOTHESIS ON SPERM ENTRANCE IN SAND DOLLAR EGGS

OLIN RULON 1

1 Dept. of Biological Sciences, Northwestern University, Evanston, Illinois, and The Hopkins Marine Station, Pacific Grove, California

1. The eggs of Dendraster excentricus lose the capacity for fertilization within two days when removed from mature ovaries and allowed to stand in open sea water at room temperature.

2. Cobaltous chloride (M/400-M/800) in sea water will preserve fertility in 5-50% of the eggs foras much as eight days.

3. Neither thioglycolic acid nor cysteine hydrochloride was found to have preserving action on fertility.

4. Certain combinations of cobaltous chloride with thioglycolic acid or cysteine were found to preserve the fertility of 50% of the eggs for 21-25 days.

5. It is suggested that cobalt and cobaltous-sulfhydryl combinations prevent the decay of fertility by preventing destructive oxidations, and that sperm entrance normally may be facilitated by the reduction of disulfide to sulfhydryl at the egg surface.






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Copyright © 1962 by the Marine Biological Laboratory.