Response of the phytoplankton community to seasonal and spatial environmental conditions in the Haldia port ecosystem located in the tropical Hooghly River estuary

Rath, Aseem R; Mitbavkar, Smita; Anil, Arga Chandrashekar

doi:10.1007/s10661-021-09255-z

Cited by 10 publications

(2 citation statements)

References 73 publications

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“…This indicates that the distribution of DIN is affected by the mixing process, whereas the distribution of DON may be affected by sophisticated biogeochemical processes (e.g., biological and photochemical activities) in addition to freshwater and seawater mixing (Bushaw et al., 1996; Grosse et al., 2019; Ianiri et al., 2022). Additionally, sufficient nutrients and high water transparency can stimulate phytoplankton growth (Rath et al., 2021), which in turn enhances the production of autochthonous DON. High Chla levels in the inner sites of the TB indicated active biological activity.…”

Section: Discussionmentioning

confidence: 99%

Terrestrial and Biological Activities Shaped the Fate of Dissolved Organic Nitrogen in a Subtropical River‐Dominated Estuary and Adjacent Coastal Area

Li,

Wu,

Jiang

et al. 2023

JGR Oceans

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Estuaries are key areas for terrestrial material transport and marine biogeochemical processes, particularly those of dissolved inorganic nitrogen (DIN) and dissolved organic nitrogen (DON). However, the fate of DON in estuaries with a high runoff remains poorly understood. In this study, we explored the translocation and transformation of DON in the Pearl River Estuary (PRE) and adjacent coastal areas of southern China based on DON concentrations, optical and fluorescence characteristics, and environmental parameters. The results revealed that DIN and DON exhibited dissimilar distributions. The distribution of DIN was primarily influenced by freshwater‐seawater mixing. In contrast, biological processes and freshwater‐seawater mixing shaped the distribution of DON. High levels of DON in the terrestrial‐dominated zone were predominantly anthropogenic sources through terrestrial inputs, whereas DON in the freshwater‐seawater mixing zone and seawater‐based zone were mainly influenced by biological activities, as high concentrations of Chla were observed in these two areas. DON exhibits fast dilution in low‐salinity areas and retention in moderate‐salinity areas (freshwater‐seawater mixing area) in summer and winter, while undergoes a rapid decrease in open water areas during winter. Consequently, DON in the PRE and adjacent coastal areas exhibited nonconservative mixing despite seasonal variations. These findings provide novel insights into the role of DON in nitrogen biogeochemical processes in river‐dominated estuaries and adjacent coastal areas.

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Section: Discussionmentioning

confidence: 99%

Terrestrial and Biological Activities Shaped the Fate of Dissolved Organic Nitrogen in a Subtropical River‐Dominated Estuary and Adjacent Coastal Area

Li,

Wu,

Jiang

et al. 2023

JGR Oceans

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“…A notable finding during this peak period was the significant evolution of phytoplankton from a diatom-dominated community to a chlorophyta/cyanophyta/cryptophyta/dinophyta-dominated community. Turbulence promoted diatom growth, but cyanophyta and dinoflagellates prefer stable water conditions (Rath et al, 2021). A significant disappearance of diatoms was strongly associated with the weakening of mixing.…”

Section: Vertical Divergences In Phytoplankton Total Density Total Bi...mentioning

confidence: 96%

Distinct differences of vertical phytoplankton community structure in mainstream and a tributary bay of the Three Gorges Reservoir, China

Wang,

Tan,

Cai

2024

Front. Plant Sci.

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The vertical distribution of phytoplankton plays a crucial role in shaping the dynamics and structure of aquatic communities. In highly dynamic reservoir systems, water level fluctuations significantly affect the physiochemical conditions and the phytoplankton community. However, the specific effects on the vertical characteristics of phytoplankton between the mainstream and the tributary bay of the reservoir remain unstudied. This study investigated the vertical aspects of phytoplankton density, biomass, α and β diversity through monthly sampling over two years in the mainstream (Chang Jiang, CJ) and a tributary bay (Xiang Xi, XX) of the Three Gorges Reservoir in China. Phytoplankton density and biomass were significantly higher in XX, indicating an increased risk of algal blooms in the tributary. The phytoplankton community in CJ showed more stable species-environment relationships, a lower Shannon index and a higher evenness index, suggesting a relatively simple structure and a more uniform distribution of phytoplankton among different water layers. Conversely, XX showed greater differences between water layers (higher β diversity), with significant negative correlations with water level and positive correlations with DO difference, dissolved silica (DSi) difference, and stratification. Peak phytoplankton density and biomass, as well as high β diversity in XX, occurred during periods of decreased water levels with strong stratification in spring and summer. A structural equation model complemented by path analysis revealed that a decrease in water level could increase β diversity either directly through internal processes with extended residence time or indirectly by modifying stratification and the vertical distribution of DSi in XX. Therefore, a proposed water quality management strategy for XX was to increase the water level or reduce β diversity by implementing artificial mixing during stratification periods. Overall, this study lies in its comprehensive investigation of the vertical characteristics of the phytoplankton community in both the mainstream and the tributary bay of the Three Gorges Reservoir, elucidating the significant impact of water level fluctuations and providing insights for targeted water quality management strategies in the tributary bay to mitigate potential ecological impacts.

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Phytoplankton community structure in the Kandla port ecosystem situated in a creek in the Gulf of Kutch, India

Rath

Mitbavkar

Anil

2023

Environ Monit Assess

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Response of the phytoplankton community to seasonal and spatial environmental conditions in the Haldia port ecosystem located in the tropical Hooghly River estuary

Cited by 10 publications

References 73 publications

Terrestrial and Biological Activities Shaped the Fate of Dissolved Organic Nitrogen in a Subtropical River‐Dominated Estuary and Adjacent Coastal Area

Terrestrial and Biological Activities Shaped the Fate of Dissolved Organic Nitrogen in a Subtropical River‐Dominated Estuary and Adjacent Coastal Area

Distinct differences of vertical phytoplankton community structure in mainstream and a tributary bay of the Three Gorges Reservoir, China

Phytoplankton community structure in the Kandla port ecosystem situated in a creek in the Gulf of Kutch, India

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