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영산강 하구의 식물플랑크톤 군집 및 수 환경: 해수역의 주별 변동

Phytoplankton Community and Surrounding Water Conditions in the Youngsan River Estuary: Weekly Variation in the Saltwater Zone

신용식|유행선
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)|2018.12|Ocean and Polar Research|제40권 제4호|pp. 191-202

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참고문헌

키워드

phytoplankton communityYoungsan River estuaryweekly monitoringHABs
주제분류해양학

초록

In this study we conducted a weekly monitoring exercise at a fixed station in the saltwater zone during the dry season (Jan−Mar, 2013) and wet season (Jun−Aug, 2013) to understand the fluctuations in phytoplankton communities and environmental factors in the Youngsan River estuary altered by a dike constructed in the coastal area. Phytoplankton communities displayed seasonality; diatoms were dominant during the dry season whereas dinoflagellates were dominant during the wet season. T-test analysis showed that water temperature was significantly different between the seasons whereas freshwater discharge from the dike was not significantly different. This suggests that seasonal variations of phytoplankton are more likely affected by water temperature than freshwater discharge. However, a short-term fluctuation was also observed in response to freshwater discharge; freshwater species appeared during or after the discharge in the dry and wet seasons and blooms of harmful species developed after the discharge. Phytoplankton communities may be affected by changes in physical factors such as turbidity and salinity and nutrient supply resulting from freshwater discharge. Especially, the nutrient supply may directly contribute to the harmful algal blooms (HABs) composed of dinoflagellates which can adapt to low salinity after freshwater discharge.

Abstract

In this study we conducted a weekly monitoring exercise at a fixed station in the saltwater zone during the dry season (Jan−Mar, 2013) and wet season (Jun−Aug, 2013) to understand the fluctuations in phytoplankton communities and environmental factors in the Youngsan River estuary altered by a dike constructed in the coastal area. Phytoplankton communities displayed seasonality; diatoms were dominant during the dry season whereas dinoflagellates were dominant during the wet season. T-test analysis showed that water temperature was significantly different between the seasons whereas freshwater discharge from the dike was not significantly different. This suggests that seasonal variations of phytoplankton are more likely affected by water temperature than freshwater discharge. However, a short-term fluctuation was also observed in response to freshwater discharge; freshwater species appeared during or after the discharge in the dry and wet seasons and blooms of harmful species developed after the discharge. Phytoplankton communities may be affected by changes in physical factors such as turbidity and salinity and nutrient supply resulting from freshwater discharge. Especially, the nutrient supply may directly contribute to the harmful algal blooms (HABs) composed of dinoflagellates which can adapt to low salinity after freshwater discharge.

참고문헌 (46)

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