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조규송,박영춘,조성주 ( Kyu Song Cho,Young Chun Park,Seong Ju Cho ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
The vertical distribution and the seasonal variation of zooplankton community and environmental factors were surveyed in Lake Soyang, a mesotrophic warm monomictic reservoir from March to September 1986. The vertical distributions of zooplankton seem to be affected by dissolved oxygen concentration, since zooplankton density was low in the intermediate oxygen minimum layer. Filinia logiseta however, Filinia logiseta sometimes appeared at deeper layer (ca. 15 m) of high dissolved oxygen. Species compositions did not show much difference with those reported in 1970s, early years of impoundment. Seasonal variation of density ranged from 5,000 individuals/㎥ in March and April to 40,000 in summer.
조규송,김범철,허우명,조성주 ( Kyu Song Cho,Bom Chul Kim,Woo Myung Heo,Sung Ju Cho ) 한국하천호수학회 1989 생태와 환경 Vol.22 No.3
The phytoplankton community succession was surveyed in a mesotrophic reservoir, Lake Soyang, from 1984 to 1988. Asterionella was dominant in winter and spring blooms all through the study period. The dominant species in summer was Peridinium bipes in 1984 and 1985. However, it was replaced with a bluegreen alga, Anabaena microspora in 1986 late summer and after the first advent the period of blugreen algal dominance showed increasing tendency year by year through 1988. The standing crops of other major taxa, dinoflagellates, diatoms, and green algae, remained at the similar level during the study period except bluegreen algae. Local blooms of Peridinium were still observed at stream inlet sites after the advent of bluegreen algae in 1986. The species diversity decreased year by year, from average 0.81 of Shannon-Wiener index in 1985 to 0.55 in 1988 mainly due to the increasing dominance of Anabaena sp. Bluegreen algal bloom in a nitrogen-rich lake is the unique feature. Nitrate nitrogen was maintained always above 0.5 mgN/1 during the study period. The scarcity of heterocysts in trichomes of Anabaena implies that nitrogen fixation is not essential in Lake Soyang because of high nitrogen content. The mechanism of bluegreen dominance in this N-rich water is to be studied further.
조규송,박영춘,조성주 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-
본 연구는 소양호의 동물성 플랑크톤의 군집조사를 파악하기 위해 플랑크톤의 수직분포를 알아보았다. 조사기간은 1986년 3월부터 9월까지 실시하였다. 본 호수의 동물성 플랑크톤은 담수 초기에 출현된 종이 그대로 장착되고 있으나 식물성 플랑크톤은 종 및 밀도가 증가햐였으며 이는 수여고한경의 변화를 시사해 주고 있다. 개체군 밀도가 가장 높은 시기는 5월과 6월로 ㎥당 개체수가 40,000개에 달하고 가장 적은 시기는 3, 4월로 약 5,000개 정도 였다. 동물성 플랑크톤의 수직분포에서 정체기와 순화기때 서로 다른 양상을 보이는 종들로는 Keratella cochlearis, Therrnocycolps