International Journal of
Advanced Multidisciplinary Application

Volume 3, Issue 4

• Author(s)Vikram Nair, Deepa Krishnamurthy, Rajesh Patel, Ananya Bose
• AffiliationDepartment of Marine Sciences and Coastal Ecology, Goa University, Panaji, Goa, India
• Page No.48-54
• Volume, Issue & YearVolume 3, Issue 4, April 2026
• Published On2026/04/06
• JournalInternational Journal of Advanced Multidisciplinary Application (IJAMA)
• ISSN No.3048-9350
• DOIhttps://doi.org/10.5281/zenodo.19438494

Article Indexing

Abstract

India's tropical coral reef ecosystems — centred on the Lakshadweep Islands in the Arabian Sea, the Andaman and Nicobar Islands in the Bay of Bengal, and the Gulf of Mannar fringing reefs along the Tamil Nadu coast — support exceptional marine biodiversity and provide critical ecosystem services to coastal and island communities including fisheries, coastal protection, and tourism valued at over INR 18,000 crore annually. Accelerating sea surface temperature rise in the Indian Ocean, amplified by the Indian Ocean Dipole and periodic El Niño-Southern Oscillation events, has transformed mass coral bleaching from a rare disturbance into a recurring annual threat, with the 2019 and 2022 bleaching events representing the two most severe thermal stress episodes recorded in the Indian reef monitoring period. This study presents a five-year longitudinal analysis (2019-2024) of bleaching severity, species-specific recovery trajectories, and cumulative biodiversity indicators across eighteen permanent reef monitoring stations across the Lakshadweep and Andaman reef systems. Sea surface temperature anomalies from NOAA Coral Reef Watch satellite data were linked to in-situ bleaching severity assessments conducted by trained reef surveyors. Results demonstrate that bleaching severity in 2022 exceeded 2019 levels at all stations, with branching Acropora and Montipora species showing the lowest recovery indices (0.19-0.34). Overall coral cover declined from 38.4 percent in 2019 to 24.7 percent in 2024, a 35.7 percent reduction. Shannon diversity index declined significantly, driven by disproportionate loss of thermally sensitive branching coral morphologies.

Keywords: coral bleaching, Lakshadweep, Andaman reefs, sea surface temperature, reef biodiversity, Acropora, recovery index, Indian Ocean, NOAA CRW, marine ecology

References

1. [1] Arthur, R., Done, T. J., Marsh, H., & Harriott, V. (2006). Local variation in the recovery of coral assemblages in the Lakshadweep atolls. Marine Ecology Progress Series, 323, 131–144.
2. [2] Bose, A., & Nair, V. (2022). Degree Heating Week thresholds and bleaching severity in Lakshadweep atoll reefs. Marine Pollution Bulletin, 184, 114219.
3. [3] Bellwood, D. R., Hughes, T. P., Folke, C., & Nystrom, M. (2004). Confronting the coral reef crisis. Nature, 429(6994), 827–833.
4. [4] Coral Triangle Initiative. (2023). State of the Coral Triangle Report 2023. CTI-CFF Secretariat, Manado.
5. [5] Eakin, C. M., Sweatman, H. P. A., & Brainard, R. E. (2019). The 2014-2017 global-scale coral bleaching event. Coral Reefs, 38(4), 539–545.
6. [6] Hughes, T. P., Barnes, M. L., Bellwood, D. R., et al. (2017). Coral reefs in the Anthropocene. Nature, 546(7656), 82–90.
7. [7] IPCC. (2022). Climate Change 2022: Impacts, Adaptation, and Vulnerability. Cambridge University Press.
8. [8] Krishnamurthy, D., Patel, R., & Bose, A. (2023). Bleaching-driven reef fish community decline in the Andaman Islands: A five-year assessment. Journal of the Marine Biological Association of India, 65(1), 42–56.
9. [9] Mohan, P. M., & Muley, E. V. (2013). Coral reef ecosystem conservation in India. Ocean and Coastal Management, 86, 11–21.
10. [10] NCCR. (2022). Indian Ocean Coral Reef Status Report 2022. National Centre for Coastal Research, Chennai.
11. [11] Nair, V., Krishnamurthy, D., Patel, R., & Bose, A. (2021). Thermal stress accumulation and coral bleaching in Lakshadweep: Satellite and in-situ evidence. Current Science, 120(8), 1342–1349.
12. [12] Patel, R., Nair, V., & Krishnamurthy, D. (2022). Species-specific bleaching responses and recovery trajectories of Indian reef-building corals. Coral Reefs, 41(6), 1642–1658.
13. [13] Spalding, M., Ravilious, C., & Green, E. P. (2001). World Atlas of Coral Reefs. University of California Press.
14. [14] Veron, J. E. N., Hoegh-Guldberg, O., Lenton, T. M., et al. (2009). The coral reef crisis. Marine Pollution Bulletin, 58(10), 1428–1436.
15. [15] ZSI. (2022). Status of Coral Reef Ecosystems of India 2022. Zoological Survey of India, Kolkata.

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