초록

낙동강의 세 지류에서(금호강, 남강, 황강) 지난 2001년 1월부터 2002년 12월까지 격주 간격으로 초식 윤충류 군집 (Brachionus spp.)과 포식 윤충류(Asplanchna spp.)간의 개체군 동태에 대해서 평가 하였다. 초식 윤충류들의 높은 군집 밀도(최고 밀도: 약 >1000개체/리터)는 두 지류에서 (금호강과 남강) 봄과 가을 시기에 반복적으로 나타났으나 다른 하나의 지류 (황강)에서는 관찰되지 않았다. 초식 윤충류 중, Brachionus spp. (7종으로 구성) 군집들이 본 조사지점에서 대표적인 종으로 파악되었다. Brachionus spp.와 연중 비슷한 시기에 출현하는 종은 Asplanchna였다. Asplanchna는 B. angularis와 B. calyciflorus종들의 높은 개체군 밀도 시기와 유사하게 개체수가 증가하였다. 그 결과로, 두 개체군들의 (B. angularis와 B. calyciflorus) 밀도는 Asplanchna출현 이후 급속히 감소하였다(금호강과 남강).그러나 다른 한 지류인 황강에서는 뚜렷한 포식 및 초식 윤충류 간의 상호관계는 파악되지 않았다. 본 조사 결과로 봄 및 가을 중순 기간의 조사지점에서는 윤충류 군집간의 뚜렷한 변화 양상이 파악되었다. 특히, Asplanchna 개체군은 높은 영양 단계 지류 시스템 내에서 봄과 가을의 총 플랑크톤 생물량과 윤충류 군집의 주요한 조절자로써의 역할을 할 것으로 파악된다.

Abstract

The herbivorous rotifers community (Brachionus spp.) and population dynamics of the predator rotifer (Asplanchna spp.) in three tributaries (Kumho R., Nam R., and Hwang R.) of the Nakdong River were evaluated on biweekly intervals from Jan. 2001 and Dec. 2002. High abundance of the herbivorous rotifers (peak density: - ca.>1000 Ind. $L^{-1}$) was observed from two tributaries (Kumho R. and Nam R.) during the spring and fall seasons, respectively. The high peaks of herbivorous rotifers were not evident in one tributary (Hwang R.). Among the herbivorous rotifers, brachionid rotifers (Brachionus spp. consisting of 7 species) were the characteristic rotifer community in this study. Brachionus spp. tended to occur together with the other perennial species, Asplanchna. Asplanchna was also present while two species of B. angularis and B. calyciflorus were highest in density. Subsequently, two populations (B. angularis and B. calyciflorus) rapidly declined, becoming rare after high peaks of Asplanchna occurred, except in one tributary (Hwang R.). We found community shifts in rotifer groups in mid-spring and mid-fall at the study site. The Asplanchna population could be appeared to play an important role in regulating the rotifer community and total plankton biomass in spring and fall at high trophic levels.

주제어

#herbivorous rotifers   #Asplanchna   #Brachionus   #Nakdong river  

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