The escape of veligers from the egg capsules of nassarius obsoletus and nassarius trivittatus (gastropoda, prosobranchia)
TLDR
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.Abstract:
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.read more
Citations
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Adaptations to Physical Stresses in the Intertidal Zone: The Egg Capsules of Neogastropod Molluscs
TL;DR: The degree to which the encapsulated embryos of inter?
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The Partitioning of Reproductive Energy between Ova and Protective Capsules in Marine Gastropods of the Genus Conus
TL;DR: Strong capsules produced by species with large ova may have evolved as a result of selection for improved protection of embryos from predation and physical stress during a protracted period of development.
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Short-term fluctuations in salinity: effects on planktonic invertebrate larvae
TL;DR: The results show that stochastic events may have a significant impact on the growth and development of pre-settlement estuarine invertebrates, implying ecological effects on recruitment success.
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Ability of some gastropod egg capsules to protect against low-salinity stress
TL;DR: Encapsulated embryos of Ilyanassa obsoleta, Nucella lamellosa, and N. lima were far more tolerant of transfer to water of reduced salinity than were embryos which had been prematurely removed from egg capsules and transferred to low-salinity sea water directly.
Journal ArticleDOI
Adaptations to intertidal development : studies on nassarius obsoletus
TL;DR: In conclusion, laboratory studies on desiccation tolerance of encapsulated embryos and rates of water loss from egg capsules failed to reveal any adaptation to intertidal development, and protection of the developing embryos seems dependent upon adult behavior.
References
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The Eggs and Larvae of the British Prosobranchs with Special Reference to those Living in the Plankton
TL;DR: The larval prosobranchs of the Capulus ungaricus have been studied extensively in the last few years as discussed by the authors, particularly those from Plymouth, with a description of the eggs and larvae.
Journal ArticleDOI
The Genital Ducts of Some British Stenoglossan Prosobranchs
TL;DR: The foregoing pages include an account of the anatomy and histology of the male and female genital ducts of Ocenebra erinacea, Nucella lapillus, Nassarius reticulatus and Buccinum undatum.