Spatio-temporal Mapping to Investigate Coral Bleaching in Andaman and Nicobar Islands, India Using Geoinformatics

Wasim,; Pandey, Arvind Chandra; Kumar, Amit; Dwivedi, Chandra Shekhar

doi:10.1007/s12524-021-01345-2

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Due to their relatively higher light requirement, slower growth rate, and preference for soft substrates (Collier et al, 2012;Badalamenti et al, 2015), seagrasses are less likely to expand to deeper coral reef areas, implying that direct interaction between corals and seagrasses is improbable. On the contrary, there is growing evidence of enhanced algal occupation of coral reefs following warming events (Hughes et al, 2019;Anton et al, 2020;Wasim et al, 2021). This interaction with macroalgae has been shown to worsen coral health status and physiological performance and is often associated with coral reef degradation (Fong and Todd, 2021;Roth et al, 2021).…”

Section: Differences In Sensitivity To Warming Among Important Groups Of Tropical Marine Organisms and Species And Its Ecological Relevanmentioning

confidence: 99%

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

et al. 2021

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Tropical shallow-water habitats represent the marine environments with the greatest biodiversity; however, these habitats are the most vulnerable to climate warming. Corals, seagrasses, and macroalgae play a crucial role in the structure, functions, and processes of the coastal ecosystems. Understanding their growth and physiological responses to elevated temperature and interspecific sensitivity is a necessary step to predict the fate of future coastal community. Six species representatives, including Pocillopora acuta, Porites lutea, Halophila ovalis, Thalassia hemprichii, Padina boryana, and Ulva intestinalis, collected from Phuket, Thailand, were subjected to stress manipulation for 5 days. Corals were tested at 27, 29.5, 32, and 34.5°C, while seagrasses and macroalgae were tested at 27, 32, 37, and 42°C. After the stress period, the species were allowed to recover for 5 days at 27°C for corals and 32°C for seagrasses and macroalgae. Non-destructive evaluation of photosynthetic parameters (Fv/Fm, Fv/F0, ϕPSII and rapid light curves) was carried out on days 0, 3, 5, 6, 8, and 10. Chlorophyll contents and growth rates were quantified at the end of stress, and recovery periods. An integrated biomarker response (IBR) approach was adopted to integrate the candidate responses (Fv/Fm, chlorophyll content, and growth rate) and quantify the overall temperature effects. Elevated temperatures were found to affect photosynthesis, chlorophyll content, and growth rates of all species. Lethal effects were detected at 34.5°C in corals, whereas adverse but recoverable effects were detected at 32°C. Seagrasses and macroalgae displayed a rapid decline in photosynthesis and lethal effects at 42°C. In some species, sublethal stress manifested as slower growth and lower chlorophyll content at 37°C, while photosynthesis remained unaffected. Among all, T. hemprichii displayed the highest thermotolerance. IBR provided evidence that elevated temperature affected the overall performance of all tested species, depending on temperature level. Our findings show a sensitivity that differs among important groups of tropical marine organisms inhabiting the same shallow-water environments and highlights the importance of integrating biomarkers across biological levels to assess their vulnerability to climate warming.

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Section: Differences In Sensitivity To Warming Among Important Groups Of Tropical Marine Organisms and Species And Its Ecological Relevanmentioning

confidence: 99%

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

et al. 2021

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“…For instance, bleaching events occurred in world wide between 1985 and 2017 was 29-45% of the reef regions(Virgen-Urcelay & Donner, 2023). However, in 1998, a review of reef health data from the Lakshadweep, the Gulf of Mannar, and the Andaman reefs from the Indian Ocean showed that coral bleaching had a considerable effect on the live coral cover in these regions (Head et al, 2019;Vinoth et al, 2012;Wallace et al, 2007;Wasim et al, 2021). Furthermore, changes in sea surface temperatures were identi ed as the cause of coral health issues in the Lakshadweep reef in the Indian Ocean between 2000 and 2003 (Arthur, 2004; Arthur et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Insights into Coral colony mortality the role of rising ocean temperatures and environmental stressors

nm,

Rajan,

2024

Preprint

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An assessment of the impact on coral reefs was conducted from 2019 to 2022 using a survey on two island reefs. The findings indicated that rising ocean temperatures were linked to the 40% of coral colony deaths that occurred in 2019 and 2021. Additionally, the concentrations of zooxanthellae in lagoon corals varied during this time. The study found that sediment, chlorophyll, photosynthetically active radiation (PAR), and temperature all had a significant impact on coral health. The significant variation in sedimentation rates—which ranged from 5.3 to 202 mg/cm2/day—suggested a high degree of sedimentation. The results of the study show how temperature, PAR, chlorophyll, and sediment levels affect coral health and emphasise the importance of monitoring and reducing these stressors. Conservation efforts can be focused on the most urgent threats to coral reef ecosystems by pinpointing the precise variables that lead to coral degradation. In the end, this research advances our knowledge of how to safeguard these essential marine environments for upcoming generations.

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Urban Sprawl Assessment in Eight Mid-sized Indian Cities Using RS and GIS

Chettry

Surawar

2021

J Indian Soc Remote Sens

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Spatio-temporal Mapping to Investigate Coral Bleaching in Andaman and Nicobar Islands, India Using Geoinformatics

Cited by 4 publications

References 42 publications

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

Insights into Coral colony mortality the role of rising ocean temperatures and environmental stressors

Urban Sprawl Assessment in Eight Mid-sized Indian Cities Using RS and GIS

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