Abstract:
:Coral reefs around the world are undergoing severe decline in the past few decades. Mass coral mortalities have predominantly been reported to be caused by coral bleaching or disease outbreaks. Temporary hypoxic conditions caused by algal blooms can trigger mass coral mortalities though are reported rarely. In this study in Gulf of Mannar (GoM), southeast India, we report a significant coral mortality caused by a bloom of the ciguatoxic dinoflagellate Noctiluca scintillans during September-October 2019. Dissolved oxygen levels declined below 2 mg l-1 during the bloom causing temporary hypoxia and mortality (up to 71.23%) in the fast growing coral genera Acropora, Montipora and Pocillopora. Due to global climate change, more frequent and larger algal blooms are likely in the future. Hence, it is likely that shallow water coral reefs will be affected more frequently by episodic hypoxic conditions driven by algal blooms. More studies are, however, required to understand the mechanism of coral mortality due to algal blooms, impacts on community composition and the potential for subsequent recovery.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Raj KD,Mathews G,Obura DO,Laju RL,Bharath MS,Kumar PD,Arasamuthu A,Kumar TKA,Edward JKPdoi
10.1038/s41598-020-79152-xsubject
Has Abstractpub_date
2020-12-17 00:00:00pages
22133issue
1issn
2045-2322pii
10.1038/s41598-020-79152-xjournal_volume
10pub_type
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