한국 부산 연안 저서 해조류의 해조상과 해조군집 구조

Abstract

Flora and community structure of benthic marine algae in Busan, Korea

Ju hee Kim

Department of Marine Biology, The Graduate School, Pukyong National University

Abstract

Flora and community structure of benthic marine algae depend on habitat. This study area located in Busan includes coastal area and estuary affected by Nak-dong river. A intertidal marine benthic algal vegetation was seasonally investigated at four stations selected from those area to clarify the community structure by quadrat method from February 2011 to October 2011. Total 78 species including 9 of cholophyta, 17 of phaeophyta and 52 of rhodophyta were found during the examined period. Among these species, 15 species were found throughout the all stations. Maximum and minimum species number were recorded at station 1(55 species) and at 3(32 species), respectively. Annual mean biomass in dry weight was 193.8 g m-2. Maximum biomass was recorded at station 2 as 284.4 g m-2, whereas minimum value was observed at station 3 as 118.9 g m-2. As based on the cluster analysis, grouping pattern between the four stations was significantly affected by season and Nak-dong river run off. Particulary, species composition and coverage between station 3 and station 4, that are strongly influenced by river run off, were similar to each other. At station 3 directly exposured on Nak-dong river run off, species diversity was relatively low and dominant species were similar throughout four seasons. However, abundance at the station was relatively high because of Ulva bloom, although biomass was relatively low. This suggests that salinity and nitrates concentrations closely related with river run-off controlled according to precipitation affect importantly to the community structure. Salinity was negative to the abundance, while nitrates showed a positive relationship with it. In conlusion, the spatio-temperal distribution of benthic marine algae in this study area was mainly determinated by the precipitation and influence range of river run-off with the seasons.