Factors responsible for the sudden outburst of Noctiluca scintillans in the Chennai coastal waters, southeast coast of India – a case study

Mishra, Pravakar; Begum, Mehmuna; Gera, Anitha; Kumar, Bhaskar; Garlapati, Deviram; Pradhan, Uma Kanta; Vashi, Athan; Bandyopadhyay, Debkumar; Naik, Subhas V.; Panda, Uma Sankar; Murthy, M.V. Ramana

doi:10.1016/j.oceano.2022.06.005

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…Furthermore, the surface coastal waters of the Tuticorin coast from Tharuvaikulam Ecopark (west) to Kasuwar Island (east) are a part of marine biological paradise; there have been several actions to put into practice to reduce anthropogenic pressure which affect the paradise. Previous ndings in India on the abrupt arrival of Green Noctiluca on the seawater surface ranged from 1200 Cells/L to 13.5 lakh Cells/L (Gopakumar et al, 2009;Miyaguchi et al, 2006;Gomes et al, 2018;Mishra et al, 2022). However, human activities are not the main cause of blooms; Green Noctiluca species dominated the plankton community during the bloom extent area, with a high concentrated cell density of 5.60 × 10 5 Cells/L in location 5.…”

Section: Green Noctiluca Outburst Abundance and Distributionmentioning

confidence: 97%

“…Although Green Noctiluca cannot affect diatom community development only by predation, they can in uence their biomass, abundance, and community. Green Noctiluca bloom is a heterotrophic dino agellate that feeds mostly on diatoms (Lotliker et al, 2018;Gomes et al, 2018;Mishra et al, 2022). Because diatoms are usually holoplankton (wanderers), their immobility makes them an ideal feeding source for Green Noctiluca.…”

Section: Green Noctiluca Outburst Abundance and Distributionmentioning

confidence: 99%

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Hypoxia conditions caused by the Green Noctiluca in the coral reef ecosystem of Tuticorin surface coastal waters along the Gulf of Mannar (Biological Paradise)

Samiyappan,

Muthu,

Tamilarasan

et al. 2023

Preprint

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The current study found that environmental variables triggered the sudden outburst of a high-density and thick mat-like algal bloom proliferated by Green Noctiluca on the coral reef surroundings in the coastal surface waters of the Tuticorin coast of the Gulf of Mannar (GoM). It is a distinguished heterotrophic dinoflagellate and bioluminescent organism in marine ecosystems. Coral reef ecosystem around the world have been waning severely in contemporary period. Climate change and disease epidemics are primarily responsible for coral devastation and other marine biodiversity. In this investigation, we report on considerable coral mortality due to a Green Noctiluca bloom on Kasuwar Island, Tuticorin Coast along Gulf of Mannar. The surface coastal waters have appeared as a strong bright green, and the microscopic laboratory analysis of the seawater samples exposed the existence of Green Noctiluca in high abundance and density. During the sample times, the mean concentration of Green Noctiluca was 3.98 × 105cells/L, associated with hypoxia and an abnormally elevated ammonia level in the Green Noctiluca bloom outburst zones. Hypoxic conditions (DO level less than 3mg/L) caused by harmful algal blooms can drive the destruction of corals, though they are reported rarely. The dissolved oxygen (DO) levels in bloom outburst zones declined below 3 mg/L. During the sampling periods, the Green Noctiluca bloom caused temporary low levels of dissolved oxygen in the fast-growing coral genera Acropora sp., Turbinaria sp., and Montipora sp., which were observed in the reef crest and reef slopes. Therefore, it is likely that shallow-water coral reefs will be affected more often by episodic smothering conditions caused by harmful algal blooms. Due to global climate change, anthropogenic activities, and the enrichment of nutrients, more frequent and larger algal blooms are expected in the future. Furthermore, long-term observation and scientific studies are required to understand the mechanisms of highly sensitive marine ecosystems due to harmful algal blooms, their impacts on community composition, and the potential for subsequent revival and conservation of marine ecology and biodiversity.

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Section: Green Noctiluca Outburst Abundance and Distributionmentioning

confidence: 97%

Section: Green Noctiluca Outburst Abundance and Distributionmentioning

confidence: 99%

Hypoxia conditions caused by the Green Noctiluca in the coral reef ecosystem of Tuticorin surface coastal waters along the Gulf of Mannar (Biological Paradise)

Samiyappan,

Muthu,

Tamilarasan

et al. 2023

Preprint

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“…During the post-monsoon season, the wind direction shifts to be predominantly from the northwest, with slightly higher average wind speeds of 15 to 20 km/h (9 to 12 mph). These winds can carry dust and airborne contaminants from construction sites or open waste dumps, posing risks to nearby communities and air quality [59].…”

Section: Study Area Detailsmentioning

confidence: 99%

IoT- and GIS-Based Environmental Impact Assessment of Construction and Demolition Waste Dump Yards

Chandrasekaran,

Subramani,

Partheeban

et al. 2023

Sustainability

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Globally, construction and demolition wastes (C&DW) are rapidly increasing, occupying 3 billion square yards of land for landfill. In India, C&D debris reaches 150 million tons per year, leading to environmental damage and resource wastage due to poor waste management practices. This study focuses on environmental impact analysis of air and water quality for selected construction and demolition waste dump yards for Chennai metropolitan city in India for two recycling units with 15 legal dumping yards. The Internet of Things (IoT) and Geographic Information System (GIS) is used to monitor and analyze environmental effect due to C&D waste dump yard. The highest concentrations of CO and CO2 in one dump site were observed at one point, with values of 7.49 ppm and 1656.06 ppm, respectively, and at another point with the lowest values of 2.3 ppm and 619.76 ppm. TDS values ranged from 269.2 mg/L to 1347.66 mg/L, and pH values ranged from 6.4 to 11.8, indicating pollution levels in drinking water. The findings suggest that improved waste management practices are urgently needed, including better regulation and enforcement of waste disposal laws, the establishment of recycling facilities with proper air and water pollution control measures, and public education campaigns for responsible waste disposal.

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Factors regulating phytoplankton biomass along the Indian coast: elucidation with long-term data

Manuri

Chandrasekaran

Perumal

et al. 2022

Environ Sci Pollut Res

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Factors responsible for the sudden outburst of Noctiluca scintillans in the Chennai coastal waters, southeast coast of India – a case study

Cited by 8 publications

References 19 publications

Hypoxia conditions caused by the Green Noctiluca in the coral reef ecosystem of Tuticorin surface coastal waters along the Gulf of Mannar (Biological Paradise)

Hypoxia conditions caused by the Green Noctiluca in the coral reef ecosystem of Tuticorin surface coastal waters along the Gulf of Mannar (Biological Paradise)

IoT- and GIS-Based Environmental Impact Assessment of Construction and Demolition Waste Dump Yards

Factors regulating phytoplankton biomass along the Indian coast: elucidation with long-term data

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