|| 要旨トップ | 目次 |
|日本生態学会第60回全国大会 (2013年3月，静岡) 講演要旨
一般講演（ポスター発表） P1-228 (Poster presentation)
Although G. herzensteini and G. intermedius are the farthest related species in the genus including 6 species, they have similar morphological characters during juvenile period. We showed from the previous study using genetic markers that they could be distinguished by the distribution pattern of the melanophores on the back of the head and the first dorsal fin. In this study, to clarify the early life history of these species, we collected the specimens which had settled down the bottom using with a sledge net during May to October 2011-2012 in south west Hokkaido. Many juveniles of both species occurred in May, and then decrease sharply. G. herzensteini was collected more than the other species in May, and disappeared after August. These results showed that G. herzensteini may migrate toward the offshore. G. herzensteini prefer deeper habitats during adult, but the migration was performed after recruitment to sandy bottom. On the other hand, G. intermedius are thought to grow up in the shallow habitat, because their adults are observed in same shallow habitat.