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Reproductive Pattern of the Epifaunal Amphipod Pontogeneia rostrata (Crustacea) on Dolsando Sandy Shore in Korea  

Yu, Ok-Hwan (Marine Living Resources Research Department, KORDI)
Jeong, Seung-Jin (Department of Biology, Pusan National University)
Suh, Hae-Lip (Department of Oceanography, Chonnam National University)
Publication Information
Ocean Science Journal / v.43, no.3, 2008 , pp. 127-133 More about this Journal
Abstract
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 malebiased, 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 epifaunal P. 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.
Keywords
Pontogeneia rostrata; life history; reproduction; epifaunal amphipod; sandy shore; recruitment; free-swimmer;
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