해초지와 주변 퇴적물에 서식하는 중형저서동물 군집 특성 비교

Abstract

To investigate the community structure and meiofaunal density in seagrass/bare non-seagrass beds, a survey was conducted at three seagrass bed locations in Doomoojin of Baegryongdo, inner harbor of Eochengdo in May 1999, and Yulim of Dolsando for every month from February to July 1999. Meiobenthic samples were collected from sediments within seagrass beds(SB) and non-seagrass bed(or adjacent to barren sand area, NSB). Nematodes were the most dominant group among representative 13 meiofaunal groups. The sub-dominant groups were benthic foraminiferas, benthic harpacticoids, and annelids. The highest density of meiofauna was recorded at a seagrass bed of Yulim(7.244 ind/10cm2 in June), and lowest density was recorded at a non-seagrass bed of Baegryoungdo(438 ind/10cm2 in May). For vertical distribution, the highest density of meiofauna was recorded at 0-2cm depth, and the density abruptly decreased with depth in all stations. The density of meiofauna in size between 0.125mm and 0.25mm was maxinum. Sediment types for the study areas ranged from sandy to sandy mud by the Folk`s classification. The density of total meiofauna, the number of taxa, and the density of the dominant groups (nematodes, benthic foraminiferans, benthic harpacticoids, annelids) between SB and NSB were significantly different. The results clearly showed the importance of seagrass bed as suitable habitat for meiofauna.