PHYTOSOCIOLOGICAL STUDY OF MARINE ALGAE AT ODONG-DO

오동도의 해조 군락

The annual variation of algal vegetation at two reefs, A and 3, of Odong-do, Yeosu, was observed two times each month during the period from June 1970 to May 1971, and the results obtained are as follows : 1. The total number of the algal species occurred were 69 species, of which 12 species belong to Chlorophyceae, 17 species to Phaeophyceae and 40 species to Rhodophyceae. No significant difference was noticed in the occurrence number of algal species at the reefs observed. 2. Most species of the algal communities in each algal belt did not show seasonal variations, but the following species showed fluctuations iii cover degree : Ulva pertusa, Enteromorpha sp., Sphacelaria sp., Scytosiphon iomentaria, Colpomenia sinuosa, Sargassum thunber gii, Pterocladia tenuis, Amphiroa ephedrea, Carpopeltis affinis, Gigartina tenera, Polysiphonia yendoi, Chondria crassicaulis, Symphyocladia atiuscula. 3. The species occurred in each algal belt at all two reefs did not show much variations and the main species in each belt are as follows: $200\~150cm$ belt - Gloiopeltis complanata, G. furcata, Enteromorpha sp., etc. : $150\~100cm$ belt - Ulva pertusa, Chondria crassicaulis, Sargassum thunbergii, etc. ; $100\~50cm$ belt - Gigartina tenera, Pterocladia tenuis, Scytosiphcn lomentaria, Polysiphonia yendoi, etc ; Below 50cm- Sargassum sagamianum, Cystophyllum sisymbrioides, Gelidium amansii, Acresorium yendoi, Microcladia elegance, etc. 4. The species occurred below 100cm level were almost the same at A and B reefs, but those above 100cm level at the A leef were different from the B reef; th: species of the algal belt of reef A were composed of Gloiopeltis complanata, Corallina pilulifera, Chondria crassicaulis, Sargassum thunbergii, Polysiphonia yendoi, Ulva Pertusa, etc., and those of reef B were composed of Gloiopeltis complanata, G. furcata, Enteromurpha sp. and Ulva pertusa, thus the main composition of reef B was very simple. 5. According to Taniguti's classification of marin: algal com nunity, the reefs observed belong to the Gigartina intermedia-Sargassum sagaminnum association (Sargasseto-Gigartinetum Taniguti) of Myelophycus caespitosus alliance (Myelophycion Taniguti).

1970넌 6월부터 1971넌 5월까지 여수 오동도의 2개 조사지점에서 월 2회 조사한 해조 군락은 아래와 같다. 1. 총출현종은 69종으로 녹조류 12종, 갈조류 17종 및 홍조류 40종이며, 조사 장소에 따른 출현종의 뚜렷한 차이는 없었다. 2. 계절별 해조 군락은 대부분 주년 출현종으로 층위가 형성되어 출현종의 변화가 적으나 Ulva pertusa, Enteromorpha sp., Sphacelaria sp., Scytosiphon iomentaria, Colpomenia sinuosa, Sargassum thunber gii, Pterocladia tenuis, Amphiroa ephedrea, Carpopeltis affinis, Gigartina tenera, Polysiphonia yendoi, Chondria crassicaulis, Symphyocladia atiuscula등은 피도의 증감이 많았다. 3. 층위의 출현종은 대체로 변화가 적어, $200\~150cm$층은 Gloiopeltis complanata, G. furcata, Enteromorpha sp.등이고 $150\~100cm$층은 Ulva pertusa, Chondria crassicaulis, Sargassum thunbergii등이며, $100\~50cm$층은 Gigartina tenera, Pterocladia tenuis, Scytosiphcn lomentaria, Polysiphonia yendoi 등이고, 제일 아래층인 50cm 이하에는 Sargassum sagamianum, Cystophyllum sisymbrioides, Gelidium amansii, Acresorium yendoi, Microcladia elegance등으로 층위가 형성되었다. 4. A, B 두 조사지점은 100cm층을 중심으로 아래층에는 차이가 적으나 위층에는 차이가 있어, A지점에는 Gloiopeltis complanata, Corallina pilulifera, Chondria crassicaulis, Sargassum thunbergii, Polysiphonia yendoi 및 Ulva pertusa등으로 층위가 형성되나, B지점에는 Gloiopeltis complanata, G. furcata, Enteromurpha sp. 및 Ulva pertusa등으로 층위가 간단하였다. 5. Taniguti의 해조 군락 분류에 의하면 Myelophycus caespitosus 군단의 Gigartina intermedia-Sargassum sagaminnum군집 (Sargasseto-Gigartinetum Taniguti)에 속한다.