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Reproductive patterns of an epifaunal amphipod,Pontogeneia rostrata, were studied on Dolsando sandy shore in Korea. The life history pattern was iteroparous, with recruitment mainly occurring
from winter to spring. The sex ratio was male-biased, especially during breeding periods. The mean body length of females
was significantly larger than that of males. Brood size and egg volume were positively related to the body length of ovigerous
females. There was no significant difference in brood size between successive breeding periods, but egg volumes were significantly
higher in early winter (December) than in late spring breeding (May and June), increasing the probability of survival to hatching.
These traits contribute to more reproductive potential in early winter than in late spring breeding. The mean brood size of
epifaunalP. rostrata was larger but the mean egg volume smaller than that of infaunal amphipods in this sampling area. We suggest that reproductive
effort for epifaunal species may be proportionally greater than for infaunal species in risky environments. 相似文献
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