Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India.

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 Rep

journal_title

Scientific reports

authors

Raj KD,Mathews G,Obura DO,Laju RL,Bharath MS,Kumar PD,Arasamuthu A,Kumar TKA,Edward JKP

doi

10.1038/s41598-020-79152-x

subject

Has Abstract

pub_date

2020-12-17 00:00:00

pages

22133

issue

1

issn

2045-2322

pii

10.1038/s41598-020-79152-x

journal_volume

10

pub_type

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