KOREASCHOLAR

The Hangang River, serving as the primary water supply source for the capital region of South Korea, plays a vital role in sustaining regional ecosystems and ensuring water quality. Phytoplankton are integral to the maintenance of aquatic ecosystems and function as bioindicators of water contamination; however, the species-level composition and environmental interactions of phytoplankton in the Hangang River remain inadequately characterized. This study investigated the phytoplankton communities within the Hangang River system across eight sampling stations over eight sampling events from May 2021 to March 2022. A total of 71 species were identified, yielding a density of 3,560 cells mL-1, with Bacillariophyceae (36 species, 2,809 cells mL-1), Chlorophyceae (24 species, 212 cells mL-1), and Cyanophyceae (5 species, 394 cells mL-1) identified as the dominant groups. The most abundant species was Aulacoseira granulata (1,616 cells mL-1, 45.4%), followed by Stephanodiscus hantzschii (420 cells mL-1, 11.8%) and Phormidium tenue (383 cells mL-1, 10.8%). Spatial similarity analysis of the phytoplankton communities revealed three distinct groups: Group A (stations 1-4, upstream), Group B (stations 5-7, midstream), and Group C (station 8, downstream). Seasonal similarity analysis further categorized the communities into three groups: Group A (May, July, August, and October 2021), Group B (November and December 2021), and Group C (February and March 2022). These findings contribute to a deeper understanding of the spatial and seasonal dynamics of phytoplankton in the Hangang River system.

Abstract
1. 서 론
2. 재료 및 방법
    2.1. 조사기간 및 조사정점
    2.2. 식물플랑크톤과 환경요인 분석
    2.3. 군집유사성 및 통계분석
3. 결 과
    3.2. 식물플랑크톤의 변화
    3.3. 식물플랑크톤 우점종의 시공간적 변동 특성
    3.4. 군집분석
3.1. 환경요인의 변화
4. 고 찰
    4.1. 환경요인의 영향
    4.2. 식물플랑크톤의 분포
    4.3. 식물플랑크톤의 공간적 특성
    4.4. 식물플랑크톤의 시간적 변화
적 요
CRediT authorship contribution statement
Declaration of Competing Interest
사 사
REFERENCES

• 공세훈((주)자연과사람) | Se Hoon Kong (Nature & Human Co., Wonju 26424, Republic of Korea)
• 이재용((주)자연과사람) | Jae Yong Lee (Nature & Human Co., Wonju 26424, Republic of Korea) Corresponding author