Reproductive characteristics and strategies of reducing-system bivalves |
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Authors: | Le Pennec M Beninger P G |
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Affiliation: | Institut Universitaire Européen de la Mer, Place Nicolas Copernic, Technop?le Brest-Iroise, Plouzané, France. |
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Abstract: | The reproductive biology of Type 3 reducing-system bivalves (those whose pallial cavity is irrigated with water rich in reducing substances) is reviewed, with respect to size-at-maturity, sexuality, reproductive cycle, gamete size, symbiont transmission, and larval development/dispersal strategies. The pattern which emerges from the fragmentary data is that these organisms present reproductive particularities associated with their habitat, and with their degree of reliance on bacterial endosymbionts. A partial exception to this pattern is the genus Bathymodiolus, which also presents fewer trophic adaptations to the reducing environment, suggesting a bivalent adaptive strategy. A more complete understanding of the reproductive biology of Type 3 bivalves requires much more data, which may not be feasible for some aspects in the deep-sea species. |
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