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Article

Biochemical Composition of Seston Reflecting the Physiological Status and Community Composition of Phytoplankton in a Temperate Coastal Embayment of Korea

1
School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
2
Department of Fisheries, University of Dhaka, Dhaka 1000, Bangladesh
*
Author to whom correspondence should be addressed.
Academic Editor: Edward Laws
Water 2021, 13(22), 3221; https://doi.org/10.3390/w13223221
Received: 23 September 2021 / Revised: 11 November 2021 / Accepted: 12 November 2021 / Published: 13 November 2021
(This article belongs to the Special Issue Eutrophication Management in Coastal Zones for Better Water Quality)
The biochemical composition of seston along a salinity gradient were examined in the low-turbidity, temperate, estuarine embayment, Gwangyang Bay in Korea. Seasonal variations in sestonic protein (PRT), carbohydrate (CHO), and lipid (LIP) concentrations were analyzed to assess the effects of physiological status and taxonomic composition of phytoplankton. The concentrations of biochemical compounds displayed a close relationship with chlorophyll a (Chla). PRT:CHO ratios were high (>1.0) in the estuarine channel in warmer months and in whole bay in February, indicating a N-replete condition for phytoplankton growth. High CHO:LIP ratios (>2.5) in the saline deep-bay area during the warmer months (>2.0) emphasized the importance of temperature and photoperiod over nutritional conditions. The low POC:Chla (<200), molar C:N (~7) ratios, and biopolymeric carbon concentrations coupled with high primary productivity indicated a low detrital contribution to the particulate organic matter pool. Diatom dominance throughout the year contributed to consistently high carbohydrate concentrations. Furthermore, generalized additive models highlighted that phytoplankton community (i.e., size) structure may serve as an important descriptor of sestonic biochemical composition. Collectively, our results suggest that physiological and taxonomic features of phytoplankton play prominent roles in determining the biochemical composition of seston, supporting the fact that the ecosystem processes in Gwangyang Bay are largely based on phytoplankton dynamics. View Full-Text
Keywords: salinity gradient; biogeochemical processes; Gwangyang Bay; suspended particulate matter; nutritional conditions; primary productivity; spatiotemporal variations salinity gradient; biogeochemical processes; Gwangyang Bay; suspended particulate matter; nutritional conditions; primary productivity; spatiotemporal variations
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MDPI and ACS Style

Bibi, R.; Kang, H.Y.; Kim, D.; Jang, J.; Kim, C.; Kundu, G.K.; Kang, C.-K. Biochemical Composition of Seston Reflecting the Physiological Status and Community Composition of Phytoplankton in a Temperate Coastal Embayment of Korea. Water 2021, 13, 3221. https://doi.org/10.3390/w13223221

AMA Style

Bibi R, Kang HY, Kim D, Jang J, Kim C, Kundu GK, Kang C-K. Biochemical Composition of Seston Reflecting the Physiological Status and Community Composition of Phytoplankton in a Temperate Coastal Embayment of Korea. Water. 2021; 13(22):3221. https://doi.org/10.3390/w13223221

Chicago/Turabian Style

Bibi, Riaz, Hee Y. Kang, Dongyoung Kim, Jaebin Jang, Changseong Kim, Goutam K. Kundu, and Chang-Keun Kang. 2021. "Biochemical Composition of Seston Reflecting the Physiological Status and Community Composition of Phytoplankton in a Temperate Coastal Embayment of Korea" Water 13, no. 22: 3221. https://doi.org/10.3390/w13223221

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