Abstract
Population dynamics and life cycle of Hyale barbicomis Hiwatari & Kajihara from a blue mussel zone were studied in Tokyo Harbor, Japan. Abundance attained a maximum of 3688 individuals 100~ cm in summer and fell to a minimum of 134 indiv. 1002 cm in winter. Temperature is an important factor in regulating abundance. Death rate exceeded birth rate during April and May even though birth rate of overwintering females indicated a high value. This was probably due to newborn juveniles being exposed to low temperature. A high birth rate maintained during summer resulted in a peak in abundance. Females reached maturity at a small size (5 mm) in summer when temperatures were high. On the basis of an in situ growth experiment and size distribution data, the summer population is estimated to live less than 2 mo. Some juveniles born in autumn overwintered as immature females of large size (7 mm). The overwintering population lived about 8 to 9 mo. Brooding females were present throughout the year, with an abundance peak in spring and a high abundance during summer to early autumn. The life cycle probably consisted of at least 3 overlapping generations. Fecundity varied seasonally.
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