River discharge effects on the contribution of small-sized phytoplankton to the total biochemical composition of POM in the Gwangyang Bay, Korea

2019 ◽  
Vol 226 ◽  
pp. 106293 ◽  
Author(s):  
Yewon Kim ◽  
Jang Han Lee ◽  
Jae Joong Kang ◽  
Jae Hyung Lee ◽  
Ho Won Lee ◽  
...  
Keyword(s):  
Biochemical Composition ◽  
River Discharge ◽  
Gwangyang Bay

scholarly journals The effects of different environmental factors on biochemical composition of particulate organic matters in Gwangyang Bay, South Korea

2016 ◽  
Author(s):  
Jang Han Lee ◽  
Dabin Lee ◽  
Jae Joong Kang ◽  
Hui Tae Joo ◽  
Jae Hyung Lee ◽  
...  
Keyword(s):  
Environmental Factors ◽  
South Korea ◽  
Biochemical Composition ◽  
Inorganic Nitrogen ◽  
Marine Ecosystem ◽  
Nitrogen Loading ◽  
Food Material ◽  
Environmental Perturbations ◽  
Governing Factor ◽  
Gwangyang Bay

Abstract. Biochemical composition of particulate organic matter (POM) through phytoplankton photosynthesis is important to determine food quality for planktonic consumers as well as physiological conditions of phytoplankton. Major environmental factors controlling for the biochemical composition were seasonally investigated in Gwangyang Bay which has only natural conditions (e.g., no artificial dams) in South Korea. Water samples for the biochemical compositions were obtained from three different light depths (100 %, 30 %, and 1 %) mainly at 3 sites in Gwangyang bay from April 2012 to April 2013. Different biochemical classes (carbohydrates [CHO], proteins [PRT], and lipids [LIP]) were extracted and then the concentrations were determined by the optical density measured with a spectrophotometer. The highest and lowest of PRT compositions among the three biochemical classes were in April 2012 (58.0 %) and August 2012 (21.2 %), whereas the highest and lowest LIP compositions were in August 2012 (49.0 %) and April 2012 (24.8 %), respectively. CHO composition was recorded high in January 2013 and maintained above 25 % during the study period. The calorific contents of food material (FM) ranged from 1.0 Kcal m−3 to 6.1 Kcal m−3 (annual mean ± S.D. = 2.8 Kcal m−3 ± 1.1 Kcal m−3). Based on Pearson's correlation coefficient analysis, a major governing factor for biochemical composition of POM was dissolved inorganic nitrogen loading from river-input in Gwangyang bay. In conclusion, relatively larger amount of FM and higher calorific contents of POM found in this study compared to other regions reflected good nutritive conditions for sustaining productive shellfish and fish populations in Gwangyang bay. Continuous observations are needed for monitoring marine ecosystem response to potential environmental perturbations in Gwangyang bay.

scholarly journals The effects of different environmental factors on the biochemical composition of particulate organic matter in Gwangyang Bay, South Korea

2017 ◽  
Vol 14 (7) ◽  
pp. 1903-1917 ◽  
Author(s):  
Jang Han Lee ◽  
Dabin Lee ◽  
Jae Joong Kang ◽  
Hui Tae Joo ◽  
Jae Hyung Lee ◽  
...  
Keyword(s):  
Organic Matter ◽  
Environmental Factors ◽  
South Korea ◽  
Particulate Organic Matter ◽  
Biochemical Composition ◽  
Inorganic Nitrogen ◽  
Marine Ecosystem ◽  
Nitrogen Loading ◽  
Food Material ◽  
Gwangyang Bay

Abstract. The biochemical composition of particulate organic matter (POM) produced through phytoplankton photosynthesis is important in determining food quality for planktonic consumers as well as the physiological conditions of phytoplankton. Major environmental factors controlling the biochemical composition were seasonally investigated in Gwangyang Bay, South Korea, which has only natural conditions (e.g., no artificial dams). Water samples for the biochemical compositions were obtained from three different light depths (100, 30, and 1 %) mainly at three sites in Gwangyang Bay from April 2012 to April 2013. Different biochemical classes (carbohydrates, CHO; proteins, PRT; and lipids, LIP) were extracted, and then the concentrations were determined by the optical density measured with a spectrophotometer. The highest and lowest PRT compositions among the three biochemical classes were found in April 2012 (58.0 %) and August 2012 (21.2 %), whereas the highest and lowest LIP compositions were found in August 2012 (49.0 %) and April 2012 (24.8 %), respectively. The CHO composition was recorded as high in January 2013 and remained above 25 % during the study period. The calorific contents of the food material (FM) ranged from 1.0 to 6.1 Kcal m−3 (annual average ± SD  =  2.8 ± 1.1 Kcal m−3). Based on a Pearson's correlation coefficient analysis, a major governing factor in the biochemical composition of POM was dissolved inorganic nitrogen loading from the river input in Gwangyang Bay. In conclusion, a relatively larger amount of FM and the higher calorific contents of POM found in this study compared to other regions reflected good nutritive conditions for sustaining productive shellfish and fish populations in Gwangyang Bay. Continuous observations are needed to monitor the marine ecosystem response to potential environmental perturbations in Gwangyang Bay.

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

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3221
Author(s):  
Riaz Bibi ◽  
Hee Yoon Kang ◽  
Dongyoung Kim ◽  
Jaebin Jang ◽  
Changseong Kim ◽  
...  
Keyword(s):  
Biochemical Composition ◽  
Size Structure ◽  
Salinity Gradient ◽  
Generalized Additive Models ◽  
Taxonomic Composition ◽  
Additive Models ◽  
Physiological Status ◽  
Bay Area ◽  
Close Relationship ◽  
Gwangyang Bay

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.

Dynamics of the macromolecular composition of the biomass of microalgae in the morning under natural light. Model

2020 ◽  
pp. 45-52
Author(s):  
Alexander S. Lelekov ◽  
Anton V. Shiryaev
Keyword(s):  
Biochemical Composition ◽  
Initial Conditions ◽  
Natural Light ◽  
Photoautotrophic Growth ◽  
Structural Part ◽  
Basic Model ◽  
Microalgae Culture ◽  
Simulation Results ◽  
Structural Parts ◽  
Macromolecular Composition

The work is devoted to modeling the growth of optically dense microalgae cultures in natural light. The basic model is based on the idea of the two-stage photoautotrophic growth of microalgae. It is shown that the increase in the intensity of sunlight in the first half of the day can be described by a linear equation. Analytical equations for the growth of biomass of microalgae and its macromolecular components are obtained. As the initial conditions, it is assumed that at the time of sunrise, the concentration of reserve biomass compounds is zero. The simulation results show that after sunrise, the growth of the microalgae culture is due only to an increase in the reserve part of the biomass, while the structural part practically does not change over six hours. Changes in the ratio of the reserve and structural parts of the biomass indicate a change in the biochemical composition of cells.

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