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논 생태계에 서식하는 생물과 긴꼬리투구새우가 분비한 화학물질이 물벼룩의 생활사와 형태에 미치는 영향
나긍환,한은진,원두희,김정희,정쥬리,김현우 한국하천호수학회 2015 생태와 환경 Vol.48 No.4
The aim of this study was to assess the interaction between Daphnia similis and various organisms related to the rice paddy ecosystem. We selected several organisms that are likely to prey on D. similis and evaluate predation rate as well as responses of D. similis to the chemical compounds exuded by these organisms. As a result of predation experiment, larval dragonfly (Anax parthenope) and Triops longicaudatus were clearly shown decreasing abundances of D. similis. Especially, Triops longicaudatus was observed higher feeding rates on D. similis than larval dragonfly. Chemical compounds from the vertebrates such as fish (Misgurnus anguillicaudatus, Pseudorasbora parva, Micropterus salmoides) and tadpole of frog (Rana nigromaculata) did not affect the life history of Daphnia. However, a potential predatory fish P. parva induced significantly longer tail spine in Daphnia. In addition, among the invertebrates (T. longicaudatus, A. Parthenope, Micronecta spp., Palaemon paucidens), chemical compounds exuded by T. longicaudatus induced shorter body and significantly longer tail spine in D. similis.
논 생태계에 서식하는 생물과 긴꼬리투구새우가 분비한 화학물질이 물벼룩의 생활사와 형태에 미치는 영향
나긍환 ( Geung Hwan La ),한은진 ( Eun Jin Han ),원두희 ( Doo Hee Won ),김정희 ( Jeong Hui Kim ),정쥬리 ( Jyoo Ri Jeong ),김현우 ( Hyun Woo Kim ) 한국하천호수학회(구 한국육수학회) 2015 생태와 환경 Vol.48 No.4
The aim of this study was to assess the interaction between Daphnia similis and various organisms related to the rice paddy ecosystem. We selected several organisms that are likely to prey on D. similis and evaluate predation rate as well as responses of D. similis to the chemical compounds exuded by these organisms. As a result of predation experiment, larval dragonfly (Anax parthenope) and Triops longicaudatus were clearly shown decreasing abundances of D. similis. Especially, Triops longicaudatus was observed higher feeding rates on D. similis than larval dragonfly. Chemical compounds from the vertebrates such as fish (Misgurnus anguillicaudatus, Pseudorasbora parva, Micropterus salmoides) and tadpole of frog (Rana nigromaculata) did not affect the life history of Daphnia. However, a potential predatory fish P. parva induced significantly longer tail spine in Daphnia. In addition, among the invertebrates (T. longicaudatus, A. Parthenope, Micronecta spp., Palaemon paucidens), chemical compounds exuded by T. longicaudatus induced shorter body and significantly longer tail spine in D. similis.
수생식물이 발달된 습지에서 동물플랑크톤 군집 분포: 수생식물의 밀도 및 종류가 부착성 윤충류와 지각류에게 미치는 영향
최종윤,나긍환,김성기,정광석,주기재 한국하천호수학회(구 한국육수학회) 2013 생태와 환경 Vol.46 No.1
We monitored 32 wetlands in order to investigate the influence of aquatic plants on zooplankton density and diversity in the littoral zone in Gyeongsangnam-do from May to June in 2011. A total of 65 zooplankton species were identified in the study sites. Among them, the diversity of epiphytic zooplankton were higher (40 species) than planktonic zooplankton. Littoral zones of all wetlands were covered by various aquatic plants, and influenced the epiphytic zooplankton assemblages. Based on the data from 1×1 (m) quadrat sampling, epiphytic and planktonic rotifer density showed no significant relationships with macrophyte cover. However, the epiphytic cladocerans density significantly increased under high aquatic plant cover (r2=0.39, p?0.05, n=32). Types of aquatic plants strongly influenced epiphytic zooplankton density. Upo and Jangcheok are locations which have well developed Phragmites communis and Ceratophyllum demersum communities in the littoral zone, and a higher density of epiphytic zooplankton was recorded on the surface of C. demersum. Especially, rotifers such as Lepadella, Monostyla and Testudinella showed obvious differences (One-way ANOVA, p?0.05 for all three species). This result suggests that epiphytic zooplankton have a substrate preference for larger surface areas, likely for adherence, on C. dimersum. In conclusion, the complex structure of the littoral plant community is expected to provide diverse refuge and microhabitats to epiphytic zooplankton.
동물플랑크톤의 서식 특성에 따른 분류와 먹이망: 상위포식자의 에너지원으로서 부착성 동물플랑크톤의 중요성
최종윤 ( Jong Yun Choi ),나긍환 ( Geung Hwan La ),정광석 ( Kwang Seuk Jeong ),김성기 ( Seong Ki Kim ),장광현 ( Kwang Hyeon Chang ),주기재 ( Gea Jae Joo ) 한국하천호수학회(구 한국육수학회) 2012 생태와 환경 Vol.45 No.4
We conducted a comprehensive monitoring for freshwater food web in a wetland system (Jangcheok Lake), from May to October, 2011. Monthly sampling for zooplankton, fish as well as organic matters, was implemented. In order to understand the food web structure and energy flow, we applied stable isotope analysis to the collected samples, based on δ13C and δ15N values of epiphytic particulate organic matter(EPOM) and particulate organic matter (POM), epiphytic and planktonic zooplankton, fish (Lepomis macrochirus). In the study site, epiphytic and planktonic zooplankton was 24 and 30 species, respectively, and coincidence species between epiphytic and planktonic zooplankton were 20 species. Epiphytic zooplankton were more abundant during the spring and early summer (May to July); however, planktonic zooplankton were more abundant during the autumn (September to October) season. Stable isotope analysis revealed that fish and epiphytic zooplankton had seasonal variations on their food sources. EPOM largely contributed epiphytic zooplankton in spring (May), but increasing contribution of POM in autumn (September) was detected. However, planktonic zooplankton depended on only POM in both seasons. Fish utilized both epiphytic and planktonic zooplankton, but small sized (1~~3 cm), fish preferred epiphytic zooplankton, where as larger sized (4~~7 cm) fish tended to consume planktonic zooplankton, and epiphytic zooplankton had important role in energy transfer. This pattern was clear when results of spring and autumn stable isotope analysis were compared. From the results of this study, we confirmed that wetlands ecosystem supported various epiphytic and planktonic zooplankton species, they depend on other food items, respectively. L. macrochirus also showed a difference of food source according to the body size, they depend on seasonal density change of zooplankton. In particular, epiphytic zooplankton was very important for growth and development of young fish in the spring.
낙동강 수생태계 먹이망 구조 분석: 안정동위원소 비 기반의 정량적 생태정보를 이용한 영양단계 시공간 분포 경향 파악
오혜지,jinmeiyan,최보형,신경훈,나긍환,김현우,장민호,이경락,장광현 한국하천호수학회 2019 생태와 환경 Vol.52 No.1
Recently, quantitative analyses of food web structure based on carbon and nitrogen stable isotopes are widely applied to environmental assessments as well as ecological researches of various ecosystems, particularly rivers and streams. In the present study, we analyzed carbon and nitrogen stable isotope ratios of POM (both planktonic and attached forms), zooplankton, benthic macroinvertebrates and fish collected from 6 sites located at Nakdong River. Samples were collected from upstream areas of 5 weirs (Sangju, Gangjeong-Goryeong, Dalseong, Hapcheon-Changnyeong, and Changnyeong-Haman Weirs) and one downstream area of Hapcheon-Changnyeong Weir in dry season (June) and after rainy season (September). We suggested ranges of their carbon and nitrogen stable isotope ratios and calculated their trophic levels in the food web to compare their temporal and spatial variations. Trophic levels of organisms were relatively higher in Sangju Weir located at upper part of Nakdong River, and decreased thereafter. However, the trophic levels were recovered at the Changnyeong-Haman Weir, the lowest weir in the river. The trophic level calculated by nitrogen stable isotope ratios showed more reliable ranges when they were calculated based on zooplankton than POM used as baseline. The suggested quantitative ecological information of the majority of biological communities in Nakdong River would be helpful to understand the response of river food web to environmental disturbances and can be applied to various further researches regarding the quantitative approaches for the understanding food web structure and function of river ecosystems as well as restoration.
담수생태계 특성을 고려한 동물플랑크톤 정량 조사법의 비교와 활용
오혜지,장광현,정현기,고순미,나긍환,김현우 한국하천호수학회 2019 생태와 환경 Vol.52 No.3
Zooplankton is essential biological assemblage in understanding the structure and function of aquatic ecosystems, since it plays as a linkage between primary producers and higher trophic level organisms such as fish. Although zooplankton has planktonic characteristics, the sampling and treatment methods for its community analyses are more complicated and variable compared with phytoplankton due to its high diversity in body size and species-specific depth selection behaviors. In the present paper, we reviewed representative classical methods for field sampling and treatments of freshwater zooplankton in relation with quantification of its community structure, and suggested appropriate methods depending on various research objectives.
우포늪의 미소갑각류 군집 동태강우량 및 이화학적 요인이 미소갑각류 군집 분포에 미치는 영향
최종윤 ( Choi Jong Yun ),김성기 ( Kim Seong Ki ),나긍환 ( La Geung Hwan ),정광석 ( Jeong Kwang Seuk ),김현우 ( Kim Hyun Woo ),김태규 ( Kim Tae Kyu ),주기재 ( Joo Gea Jae ) 한국하천호수학회 2012 생태와 환경 Vol.45 No.3
The relationships between environmental factors and the dynamics of the microcrus-tacean community, including planktonic or epiphytic or epiphytic cladocerans and copepods, were studied at Upo Wetlands from 2001 to 2010.Among 10 identified cladoceran taxon, epiphytic cladocerans (Alona, Camptocercus, Simocephalus, Diaphanosoma, Sida)and planktonic claadocerans (Bosmina, Ceriodaphnia, Daphnia, Moina, Scapho-leberis) showed distinctive patterns in appearance throughout the year. Overall,epi-phytic cladocerans were more abundant during the aquatic plant development season (May to Nov.),planktonic cladocerans were similarly distributed throughout the sea-sons,but showed a lower density than epiphytic cladocerrans. The seasonal changes in copepods abundance showed a similar seasonal pattern when compared to epiphytic cladocerans. Planktonic cladocerans showed no significant relationship to rainfall and physic-chemical factors, while epiphytic cladocerans exhibited a distinct relationship with rainfall and water temperature(n=120,p<0.01),and a negative relationship with pH and conductivity (n=120,p<0.05).Among the epiphytic cladocerans, the Alona and Diaphanosoma showed a distinctive correlation with environmental factors, and their density was affected by rainfall and water temperature(n=120,p<0.01).Copepods had a positive relationship with rainfall(n=120,p<0.01)and water temperature(n=120,p<0.05).In conclusion, changes in rainfall and water temperature can affect the seasonal changes of microcrustacean community and abundance in Upo Wetlands.
메소코즘을 이용한 지각류, 요각류 및 패 충류의 섭식 성 향 분 석; 탄소, 질 소 안정동위원소비의 믹싱모델 (R package SIAR)을 이용한 정량 분 석
장광현,서동일,고순미,Sakamoto Masaki,남귀숙,최종윤,김민섭,정광석,나긍환,김현우 한국수생태학회(구 한국하천호수학회) 2016 생태와 환경 Vol.49 No.4
Stable Isotope Analysis (SIA) of carbon and nitrogen is useful tool for the understanding functional roles of target organisms in biological interactions in the food web. Recently, mixing model based on SIA is frequently used to determine which of the potential food sources predominantly assimilated by consumers, however, application of model is often limited and difficult for non-expert users of software. In the present study, we suggest easy manual of R software and package SIAR with example data regarding selective feeding of crustaceans dominated freshwater zooplankton community. We collected SIA data from the experimental mesocosms set up at the littoral area of eutrophic Chodae Reservoir, and analyzed the dominant crustacean species main food sources among small sized particulate organic matters (POM, <50 μm), large sized POM (>50 μm), and attached POM using mixing model. From the results obtained by SIAR model, Daphnia galeata and Ostracoda mainly consumed small sized POM while Simocephalus vetulus consumed both small and large sized POM simultaneously. Copepods collected from the reservoir showed no preferences on various food items, but in the mesocosm tanks, main food sources for the copepods was attached POM rather than planktonic preys including rotifers. The results have suggested that their roles as grazers in food web of eutrophicated reservoirs are different, and S. vetulus is more efficient grazer on wide range of food items such as large colony of phytoplankton and cyanobacteria during water bloom period.