부산 일광만 저서해조류의 해조상과 군집구조

Abstract

This study was carried out to clarify species composition and community structure of benthic marine algae at intertidal and subtidal zone of Ilkwang Bay on the southern east coast of Korea. Total 103 species including 10 of green algae, 17 of brown algae, 76 of red algae were collected and identified. Among these species, 21 species were found throughout the year. Ulva pertusa, Enteromorpha linza, Grateloupia lanceolata, Chondracanthus intermedia and Caulacanthus ustulatus were distributed dominantly in upper intertidal zone. By contrast, crustose coralline algae, Grateloupia spp., Chondracanthus tenellus, Prionitis cornea and Sargassum spp. occured predominantly in middle intertidal zone. Grateloupia spp., Sargassum spp., Ecklonia cava and Ulva pertusa were dominant in lower intertidal zone. Whole biomass was of 478.3g/㎡. 731.8g/㎡, 624.5g/㎡ and 78.5g/㎡ were recorded in site1, 2 and 3, respectively. The R/P, C/P, (R+C)/P value reflecting algal flora characteristics was 4.5, 0.6, and 5.1, respectively. Two groups produced by cluster analysis, one including site 1, 2 and the other including site 3, showed meaningful difference in similarity, each other. Site 3 showed the limited species composition due to inflow of fresh water and absence of solid substratum. However, there was no significant difference between site 1 and site 2. In conclusion, the number of marine algae species and biomass in Ilkwang Bay were markedly reduced comparing with the previous study and was rarely observed under 7m depth. These suggest that a solution for reconstruction of the poor marine algal vegetation due to coastal pollution by local development and extending of barren ground all over the coast of Korea is considerably demanded.