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Induction of settlement and metamorphosis of the pacific oyster, Crassostrea gigas (Thunberg), by L-DOPA and catecholamines
A model of natural settlement and metamorphosis is proposed which considers both exogenous environmental cues and endogenous neuroactive factors. Expand
Ultrastructure of a cephalic sensory organ in larvae of the gastropod Phestilla sibogae (Aeolidacea, Nudibrachia).
- D. Bonar
- Biology, Medicine
- Tissue & cell
The cephalic sensory organ is a superficial sensory receptor located between the velar lobes at the level of the shell aperture and may be a derivative of the original apical tuft of the trochophore stage. Expand
Competence and delay of metamorphosis in the Pacific oysterCrassostrea gigas
A mechanistic model of oyster settlement and metamorphosis is proposed which incorporates these new data and was correlated with, but not dependent upon, larval size and eyespot development. Expand
Pharmacological evidence that alpha1.-adrenoceptors mediate metamorphosis of the pacific oyster, Crassostrea gigas
Oyster larvae can be induced to metamorphose by exposure to the natural vertebrate adrenergic agonists, epinephrine and norepinephrine, and receptors similar to vertebrate-type alpha1-adrenoceptors mediate oyster metamorphosis are demonstrated, the first evidence for alpharadrenOceptors in molluscs. Expand
Ammonia Induces Settlement Behavior in Oyster Larvae.
- S. Coon, M. Walch, W. Fitt, R. Weiner, D. Bonar
- Biology, Medicine
- The Biological bulletin
- 1 December 1990
Oyster larvae exposed to solutions of NH4Cl exhibit stereotypical settlement behavior similar to that which normally precedes cementation and metamorphosis, suggesting that NH3 acts by increasing intracellular pH. Expand
Chemical production of cultchless oyster spat using epinephrine and norepinephrine
Epinephrine-induction appears to have no negative effects on survival or development, with spat grown for periods of 12 months appearing normal. Expand
Metamorphosis of ilyanassa obsoleta natural and artificial inducers
Metamorphosis of the marine gastropod Phestilla Sibogae Bergh (nudibranchia: aeolidacea). I. Light and electron microscopic analysis of larval and metamorphic stages
The structure and fate of transitory larval organs of Phestilla sibogae Bergh were studied before, during, and after metamorphosis with both light and electron microscopy to elucidate the morphology of these organs and the mechanisms by which they are lost. Expand
Pharmacological evidence that alpha 1-adrenoceptors mediate metamorphosis of the Pacific oyster, Crassostrea gigas.
Data demonstrate that receptors similar to vertebrate-typealpha 1-adrenoceptors mediate oyster metamorphosis, the first evidence for alpha 1- adrenoceptor receptors in molluscs, and provides an important clue to the control of the complex process of mollsuscan metamorphoses and to the evolution of vertebrate adrenergic receptors. Expand
Spawning and development of three coral-associated Lithophaga species in the Red Sea
Metamorphically competent larvae were capable of delaying metamorphosis for up to 4mo, which would allow an extended period for dispersion and would increase the chance of finding a suitable substratum in the natural environment. Expand