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Integrated Role of SST, PAR and CDOM in Summer Reef Bleaching during 2010 and 2011 along the Lakshadweep Islands
The role of sea-surface temperature (SST), photosynthetically active radiation (PAR) and chromophoric dissolved organic matter (CDOM) on bleaching events along the Lakshadweep archipelago was studied for the summer of 2010 and 2011. The present study revealed similar SST pattern (30.8-31.9°C) and high PAR availability (48-50 E m-2 day-1) during the summer weeks of 2010 and 2011. However, the CDOM content varied significantly between 0.5 and 7 during 2010 and 2011. Stress from the elevated SST and PAR levels coinciding with low CDOM content (ultra violet radiation (UVR) transparent water column) might have resulted in large-scale bleaching during 2010. Low PAR and high CDOM (UVR opaque water column) might have prevented Lakshadweep corals from large-scale bleaching during 2011. Statistical analysis also confirmed that the high bleaching event of 2010 was due to coupled stress imparted by SST, PAR, CDOM and the unusually calm state of the sea.
Keywords
Bleaching, Dissolved Organic Matter, Photo-Synthetically Active Radiation, Sea-Surface Temperature.
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- Gorean, T. J. and Hayes, R. L., Coral bleaching and ocean hotspots. Ambio, 1994, 23(3), 176–180.
- Wilkinson, C., Global and local threats to coral reef functioning and existence. Mar. Freshwater Res., 1999, 50, 867–878.
- Jokiel, P. L. and Coles, S. L., Response of Hawaiian and other Indo-Pacific reef corals to elevated temperature. Coral Reefs, 1990, 8(4), 155–162.
- Arthur, R., Coral bleaching and mortality in three Indian reef regions during an El Nino southern oscillation event. Curr. Sci., 2000, 79(12), 1723–1729.
- Rajasurya, A., Zahir, H., Venkataraman, K., Islam, Z. and Tamelander, T., Status of coral reefs of South Asia: Bangladesh, Chagos, India, Maldives and Sri Lanka. Global Coral Reef Monitoring Network Report, Australian Institute of Marine Sciences, 2004.
- Berkelmans, R. and Willis, B. L., Seasonal and local spatial patterns in the upper thermal limits of corals on the inshore Central Great Barrier Reef. Coral Reefs, 1999, 18, 219–228.
- McClanahan, T. R., Ateweberhan, M., Muhando, C., Maina, J. and Mohammed, S. M., Effect of climate and seawater temperature variation on coral bleaching and mortality. Ecol. Monogr., 2007, 77, 503–525.
- Vivekanandan, E., Ali, M. H., Jasper, B. and Rajagopalan, M., Thermal thresholds for coral bleaching in the Indian seas. J. Mar. Biol. Assoc. India, 2008, 50(2), 209–214.
- Hoegh-Guldberg, O., Climate change, coral bleaching and the future of the world’s coral reefs. Mar. Freshwater Res., 1999, 50, 839–866.
- McField, M. D., Coral response during and after mass bleaching in Belize. Bull. Mar. Sci., 1999, 64, 155–172.
- Berkelmans, R., Time-integrated thermal bleaching thresholds of reefs and their variation on the Great Barrier Reef. Mar. Ecol. Prog. Ser., 2002, 229, 73–82.
- Glynn, P. W., Coral reef bleaching: ecological perspectives. Coral Reefs, 1993, 12, 1–17.
- Lesser, M. P., Depth-dependent photo acclimatization to solar ultraviolet radiation in the Caribbean coral Montastraea faveolata. Mar. Ecol. Prog. Ser., 2000, 192, 137–151.
- Lesser, M. P. and Farrell, J. H., Exposure to solar radiation increases damage to both host tissues and algal symbionts of corals during thermal stress. Coral Reefs, 2004, 23, 367–377.
- Levy, O., Achituv, Y., Yacobi, Y. Z., Dubinsky, Z. and Stambler, N., Diel ‘tuning’ of coral metabolism: physiological responses to light cues. J. Exp. Biol., 2006, 209, 273–283.
- Blough, N. V. and Del Vecchio, R., Chromophoric DOM in the coastal environment. In Biogeochemistry of Marine Dissolved Organic Matter (eds Hansell, D. A. and Carslon, C. A.), Academic Press, California, 2002, pp. 509–578.
- Nelson, N. B. and Siegel D. A., Chromophoric DOM in the open ocean. In Biogeochemistry of Marine Dissolved Organic Matter (eds Hansell, D. A. and Carslon, C. A.), Academic Press, California, 2002, pp. 547–578.
- Zepp, R. G., Solar ultraviolet radiation and aquatic carbon, nitrogen, sulfur and metals cycles, UV effects in aquatic organisms and ecosystems. In Comprehensive Series in Photochemistry and Photobiology (eds Helbling, E. W. and Zagarese, H.), The Royal Society of Chemistry, London, 2003, pp. 137–183.
- West, J. M. and Salm, R. V., Resistance and resilience to coral bleaching: implications for coral reef conservation and management. Conserv. Biol., 2003, 17, 956–967.
- Mapstone, B. D. and Ayling, A. M., An investigation of optimum methods and unit sizes for the visual estimation of abundances of some coral reef organisms. The Great Barrier Reef Marine Park Authority, Townsville, Australia, 1994, p. 74.
- English, S., Wilkinson, C. and Baker, V., Survey Manual for Tropical Marine Resources, Australian Institute of Marine Sciences, Queensland, Australia, 1997, 2nd edn, p. 329.
- Sridhar, P. N., Ali, M. M., Rao, M. V. and Nagamani, P. V., Photosynthetically active radiation, a critical parameter for mass coral bleaching in Northern Indian occean. Curr. Sci., 2012, 102(1), 114–118.
- Morris, D. P. and Hargreaves, B. R., The role of photochemical degradation of dissolved organic carbon in regulating the UV transparency of three lakes on the Pocono Plateau. Limnol. Oceanogr., 1997, 42(2), 239–349.
- Urban, L. W., Effects of meterological forcing on CDOM in the South Atlantic Bight, Ph D thesis, Creighton University, Omaha, Nebraska, USA, 2010.
- Vodacek, A., Blough, N. V., DeGrandpre, M. D., Peltzer, E. T. and Nelson, R. K., Seasonal variation of CDOM and DOC in the Middle Atlantic Bight: terrestrial inputs and photooxidation. Limnol. Oceanogr., 1997, 42, 674–686.
- Glynn, P. W., Coral reef bleaching: facts, hypotheses and implications. Global Change Biol., 1996, 2, 495–509.
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