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Biol Bull 149: 580-589. (December 1975)
© 1975 Marine Biological Laboratory
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THE ESCAPE OF VELIGERS FROM THE EGG CAPSULES OF NASSARIUS OBSOLETUS AND NASSARIUS TRIVITTATUS (GASTROPODA, PROSOBRANCHIA)

JAN A. PECHENIK 1

1 Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 and Massachusetts Institution of Technology, Cambridge, Massachusetts 02139

1. The loosening of the egg capsule plug prior to escape of the veligers is shown to be chemically mediated in Nassarius obsoletus and N. trivittatus.

2. The hatching substance is not produced continuously during development, but rather in a short pulse beginning just prior to hatching and ending within 4 hours of escaping from the capsule, for N. obsoletus.

3. The hatching substance produced by the embryos of one species is effective only on the capsule plugs of that species, for the two species studied.

4. The substance is functionally short-lived, at room temperature in sea water, losing its potency within three hours after its secretion by N. obsoletus.

5. The observed rate at which N. obsoletus veligers leave their egg capsules is shown to be in close agreement with the rate predicted from an equation assuming random movements of individuals within the capsules.






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Copyright © 1975 by the Marine Biological Laboratory.