Abstract
Mysella bidentata (Montagu) is found in high densities in an Amphiura filiformis (O. F. Muller) community in Inner Galway Bay, west coast of Ireland. As part of an ongoing investigation at one station within this community, the population dynamics and reproductive pattern of this bivalve were investigated during the period November 1978-December 1981. Monthly sampling over the 3 yr period revealed a mean population density of 745±672 individuals m-2. Recruitment occurred during August-October and three year-classes were identified. Growth rates were assessed by analysis of length-frequency histograms and winter growth checks. Individuals from the Y1 and Y2 year-classes functioned as hermaphrodites during the 1980 and 1981 reproductive seasons. The Y0 year-class contained both males and hermaphrodites. Results are compared with available information on the same species from other locations.
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