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http://dx.doi.org/10.7837/kosomes.2016.22.6.738

The Characteristics of Spatio-Temporal Distribution on Phytoplankton in the Nakdong River Estuary, during 2013-2015  

Yoo, Man-Ho (Oceanic Climate & Ecology Research Division, NIFS)
Youn, Seok-Hyun (Oceanic Climate & Ecology Research Division, NIFS)
Park, Kyung-Woo (Oceanic Climate & Ecology Research Division, NIFS)
Kim, A-Ram (Oceanographic Observation Division, KHOA)
Yoon, Sang-Chol (Oceanic Climate & Ecology Research Division, NIFS)
Suh, Young-Sang (Oceanic Climate & Ecology Research Division, NIFS)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.22, no.6, 2016 , pp. 738-749 More about this Journal
Abstract
To understand the characteristics of the spatio-temporal distribution of phytoplankton after barrage construction in the Nakdong River Estuary, this study investigated relevant environmental parameters and phytoplankton status based on bi-monthly samples collected from the Nakdong River Estuary itself from February 2013 to December 2015. Environmental parameters did not differ significantly across these years but did vary between zones and seasons. The results suggested that the upper zone was dominated by fresh-water diatoms, green algae, and blue-green algae, whereas the lower zone was mostly dominated by dinoflagellates. The presence of Stephanodiscus spp., Asterionellopsis formosa, and Microcystis spp. in the upper zone was related to the inflow of freshwater discharge by artificial control of dyke gates. The dominant phytoplankton species in this zone were dependent on temperature, wind speed, DIP, and DIN, while those in the lower zone were mostly dependent on nutrients and wind speed. In addition, at the lower zone, there were negative correlations between Prorocentrum donghaiense, DIN, and wind speed, with its abundance being higher during the summer than other seasons. Analysis of temporal variations did not indicate any significant differences in the upper zone but did reveal variations among seasons at the lower zone. Except in 2014, the lower zone could be divided into periods dominated by diatoms (October-April) and dinoflagellates (June-August). These results suggest that the characteristics of the phytoplankton community were influenced by changes in the inflow of freshwater species and nutrients given the difference in the range affected by freshwater discharge.
Keywords
Nakdong Estuary; Phytoplankton; Spatio-temporal distribution; Freshwater discharge; Limiting factors;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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