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Population Dynamics of Predator (Asplanchna spp.) and its Impact on Herbivorous Rotifers Community in Three Tributaries of the Nakdong River (S. Korea)  

Kim, Hyun-Woo (Dept. of Environmental Education, Sunchon National University)
Chang, Kwang-Hyeon (Research and Education Center for Inlandwater Environment, Shinshu University)
Shin, Woon-Kyun (Dept. of Biology, Pusan National University)
La, Geung-Hwan (Dept. of Biology, Pusan National University)
Jeong, Kwang-Seuk (Dept. of Biology, Pusan National University)
Joo, Gea-Jae (Dept. of Biology, Pusan National University)
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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.
Keywords
herbivorous rotifers; Asplanchna; Brachionus; Nakdong river;
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