Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Long-term Studies on Zooplankton Community in the Hwang River Ecosystem

황강생태계 동물플랑크톤 군집의 장기변화

  • Eui-Jeong Ko (Team of Ecological and Natural Map, National Institute of Ecology) ;
  • Yu-Ji Heo (Department of Environmental Education, Sunchon National University) ;
  • Gea-Jae Joo (Department of Biological Science, Pusan National University) ;
  • Hyun-Woo Kim (Team of Ecological and Natural Map, National Institute of Ecology)
  • Received : 2022.11.28
  • Accepted : 2022.12.14
  • Published : 2022.12.31
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Abstract

The research was based on long-term studies on the major physico-chemical and hydrological factors and zooplankton community dynamics in the Hwang River. We had 341 times survey and collected zooplankton samples in the Hwang River of mid-Nakdong River from 1995 to 2013. We identified 97 zooplankton species, including 77 rotifers, 16 cladocerans, and 4 copepods. The total zooplankton abundance and species diversity were shown distinctive temporal variation (ANOVA, p<0.001). Annual average of zooplankton population density was 58.4±3.2 ind L-1 (n=341) and the lowest was 17.0±3.8 ind L-1 (1996, n=20), while the highest was 151.5±32.3 ind L-1 (2010, n=22). For zooplankton, small rotifer groups(e.g., Keratella sp., Brachionus sp., Trichotria sp.) dominated the study site for 19 years survey. Statistical analysis revealed that there were positive relationships with SiO2 (p=0.002) and water level (p<0.001) for the high abundance of rotifer community. There were considerable variations both the total cladocerans population and the number of cladocerans' species concerning annual precipitation. Despite the appearance of various zooplankton in the Hwang River, the mean population density remained low. Due to the lateral structures in the Nakdong River, the downstream basin of the Hwang River is inevitably affected. The zooplankton community in our study site is considered to be mainly influenced by external factors that can stably increase and maintain the volume of the water body and internal factors that induce an increase in food sources through the inflow of nutrients into the water body.

본 연구는 황강의 주요 이화학적 및 수문학적 요인과 동물플랑크톤 군집 변화에 대한 장기조사를 기반으로 수행하였다. 1995년부터 2013년까지 낙동강 중류에 위치한 황강에서 341회 조사를 통해 확인된 동물플랑크톤은 총 97종으로, 윤충류 77종, 지각류 16종, 요각류 4종이 출현하였다. 전체 동물플랑크톤 출현밀도와 종 수는 뚜렷한 시간적 변화를 보였다. 연평균 동물플랑크톤 밀도는 58.4±3.2 ind L-1 (n=341)이었으며, 최저 17.0±3.8 ind L-1 (1997, n= 20), 최대 151.5±32.3 ind L-1 (2010, n=22)으로 확인되었다. 19년의 조사기간 동안 동물플랑크톤 군집 중 크기가 작은 윤충류(Keratella sp., Brachionus sp., Trichotria sp.)가 우점하였다. 윤충류 밀도가 50% 이상을 차지하는 우점 기간은 이산화규소(p=0.002) 및 수온(p<0.001)과의 양의 상관성이 나타났으며, 연강수량 변동폭 및 강수 기간에 따라 지각류는 종 수 및 밀도의 큰 변화를 보였다. 본 연구를 통해 황강에서 동물플랑크톤 종 수가 다양함에도 불구하고, 평균 밀도는 지속적으로 낮은 수준을 유지하는 것을 확인할 수 있었다. 황강 하류의 동물플랑크톤 군집은 수체의 부피가 안정적으로 증가하고 유지될 수 있는 외적 요인과 수체 내 영양염류 유입을 통해 먹이원의 증가를 유도하는 내적 요인에 의해 영향을 받는 것으로 판단된다.

Keywords

Acknowledgement

이 논문은 2022년 순천대학교 학술연구비(과제번호: 2022-0313) 공모 과제로 연구되었습니다.

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