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강-저수지 복합형 시스템내 봄 동물플랑크톤의 역동성 (낙동강, 한국): 식물플랑크톤 생체량 조절자로서의 역할
김현우 ( Kim Hyeon U ),장광현 ( Jang Gwang Hyeon ),정광석 ( Jeong Gwang Seog ),주기재 ( Ju Gi Jae ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.4
During a three-year study (2000-2002), dramatic changes in the phytoplankton biomass and high transparency were repeatedly observed during mid-spring in the lower part of the Nakdong River. Rotifers(Branchonus, Keratella, Polyarthra), sharply increased (to near 20 days) and water temperature increased from 10℃ to > 20℃ toward the end of springm small cladocerans noticeably increased. Once phytoplankton biomass passed their peak stage in the min-spring, a short period (one or two weeks) of relatively low phytoplankton biomass and high Secchi transparencies occurred. Grazing by the zooplankton was highest in spring, thus, it seems that high grazing activities of zooplankton grazing regulated phytoplankton dynamics in the river. The results indicate that the role of zooplankton grazing in controlling the phytoplankton biomass becomes more important during the spring when river water is relatively stagnant.
치어의 먹이선호도 및 포식이 낙동강 동물플랑크톤군집에 미치는 영향
장광현 ( Jang Gwang Hyeon ),김현우 ( Kim Hyeon U ),라긍환 ( La Geung Hwan ),정광석 ( Jeong Gwang Seog ),주기재 ( Ju Gi Jae ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.1
In the present study, pre preference of juvennile fishes was examined using as experimental approach. Zooplankton composition, as a prey of thr fish, was evaluated by taking into account the species as well as body size of juveniles in the aquqrium. The redation of juvenile fishes is known to be an important factor in changes of zooplankton communities. in some previous studies at the regulated Nakdong River, the collapse of large cladcoerans and an increase in the rotifer population by selective predation during spring and summer were observed. This study focused on the predation of juvenile fisheds such as Hyporhamphus sajori, Rhinogobius brunneus, and Opsariichtys uncirostris amurensis on zooplankton community structure in mesocosm scale experiments. These fishes selected the cladoceran Monia micrura with highest individual preference value(Manly.Chesson index) among zooplankton prey in the experimental aquarium. Whrn the size-selective prey prefernces of the juvenile fish were compared, both small (body size<2㎝)and large(body size>2㎝) juveniles of O. uncirostris positively selected M. micrura. in the outdoor experimental tanks, juvenile fishes consuumed the cladoceran M. micrura, resulting in an igh abundance of the rotifer, Polyarthra spp. The results suggest that juvenile fish predation may play an important role in regulating the zooplankton community structure by reducing the cladoceran density and increase of rotifers in the Nakdong River during spring and summer.