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An algal bloom of Noctiluca scintillans (NS) was monitored for 20 days in the Arabian Sea during February 2017. The stations under the influence of NS had low temperature and high salinity compared to outside indicating influence of convective mixing. The microscopic cell count of NS reached a value of 52,600 cells l. The surface variability in oxygen and pCO measured alongside showed a strong disconnect. Modest supersaturation of surface waters (ΔpCO = 3-75 μatm) was observed around the NS bloom compared to outside. However, as these stations were under the influence of convective mixing, the observed change in pCO due to subsurface ventilation cannot be ruled out. From the viewpoint of climate change and its influence on oceanic processes, constant monitoring of this bloom becomes essential due to its survival strategy in nutrient-depleted conditions and light of the present observations.
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http://dx.doi.org/10.1016/j.marpolbul.2023.115913 | DOI Listing |
Mar Pollut Bull
September 2025
Ecological Risk Research Department, Korea Institute of Ocean Science & Technology, Geoje 53201, Republic of Korea; Department of Ocean Science, KIOST School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea. Electronic address:
Eutrophication in semi-enclosed coastal systems remains a persistent concern due to restricted water circulation and continuous nutrient inputs. To better characterize nutrient-driven water quality degradation, we applied a threshold-based analysis to seasonal monitoring data collected from Masan Bay, South Korea, between 2010 and 2015. Eutrophication status was assessed using a composite Eutrophication Index (EI) integrating chemical oxygen demand (COD), dissolved inorganic nitrogen (DIN), and dissolved inorganic phosphorus (DIP).
View Article and Find Full Text PDFWater Res
September 2025
State Key Laboratory of Geomicrobiology and Environmental Changes, Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences (Wuhan), Wuhan 430078, China; Hubei Key Laboratory of Marine Geological Resource, China University of Geosciences, Wuhan 430074, China. Electronic addre
Anthropogenic climate warming and coastal eutrophication have restructured phytoplankton communities in the East China Sea; however, the centennial-scale dynamics of phytoplankton remain poorly understood. By systematically integrating 33 sediment cores, we reconcile the variations of primary productivity during the last century. The results revealed increased primary productivity during the past century, while the phytoplankton groups showed divergent eco-regional responses: river-dominated estuaries have partially mitigated the dominance of dinoflagellates (1980s) via Changjiang nitrate loading, while potential hypoxic regions shifted earlier (1960s) under thermal forcing and silicate concentration.
View Article and Find Full Text PDFBioinform Adv
August 2025
Department of CSE, BUET, Dhaka 1000, Bangladesh.
Motivation: Heavy usage of synthetic nitrogen fertilizers to satisfy the increasing demands for food has led to severe environmental impacts like decreasing crop yields and eutrophication. One promising alternative is using nitrogen-fixing microorganisms as biofertilizers, which use the nitrogenase enzyme. This could also be achieved by expressing a functional nitrogenase enzyme in the cells of the cereal crops.
View Article and Find Full Text PDFNPJ Biofilms Microbiomes
September 2025
GFZ Helmholtz Centre for Geosciences, Potsdam, Germany.
Eukaryotic algae-dominated microbiomes thrive on the Greenland Ice Sheet (GrIS) in harsh environmental conditions, including low temperatures, high light, and low nutrient availability. Chlorophyte algae bloom on snow, while streptophyte algae dominate bare ice surfaces. Empirical data about the cellular mechanisms responsible for their survival in these extreme conditions are scarce.
View Article and Find Full Text PDFMar Pollut Bull
September 2025
Department of Science and Environmental Studies, The Education University of Hong Kong, New Territories, Hong Kong; State Key Laboratory of Marine Environmental Health, City University of Hong Kong, Kowloon, Hong Kong. Electronic address:
Climate change and anthropogenic pressures alter phytoplankton phenology, distribution, and bloom frequency. Healthy phytoplankton communities are crucial for biogeochemical processes, blue carbon sequestration, and climate change mitigation. By employing high-throughput 18S V4 rRNA metabarcoding, we addressed the need for profiling phytoplankton community and response mechanisms in urbanized coastal ecosystems.
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