Coral reef bleaching at Agatti Island of Lakshadweep atolls, India |
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Authors: | Ramar Vinoth Mohan Gopi Thipramalai Thankappanpillai Ajith Kumar Thirunavukarassu Thangaradjou Thangavel Balasubramanian |
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Institution: | (1) National Biodiversity Authority, 475, 9th South Cross Street, Kapaleeswarar Nagar, 600 041 Neelankarai, Chennai, India and |
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Abstract: | A survey on coral bleaching was carried out at Agatti Island of Lakshadweep from May to June 2010. Elevated sea surface temperatures
(SSTs) of the region exceeded the seasonal average and delayed the onset of monsoon, which triggered widespread bleaching
of corals. The Agatti reefs showed an average of 73% bleached corals with apparent bleaching-related mortality of sea anemones
(87%) and giant clams (83%). The SST increased up to 34 °C with an average maximum SST of 32.5 during the study °C period
between May and June 2010. Coral reefs on the southern side of the island are fully or partially exposed to sun light during
low tide in contrast to the other side. This suggests that the mortality is more likely due to the low tide exposure than
exclusively due to the elevated SST. Observations indicated a clear increase in coral bleaching during April 2010, at levels
higher than that in normal summer. |
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Keywords: | coral bleaching sea surface temperature mortality sea anemone |
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