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...

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Autores principales:	K. Diraviya Raj, G. Mathews, David O. Obura, R. L. Laju, M. Selva Bharath, P. Dinesh Kumar, A. Arasamuthu, T. K. Ashok Kumar, J. K. Patterson Edward
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/716c244a807e4cb688583b4d3df77ea2
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spelling	oai:doaj.org-article:716c244a807e4cb688583b4d3df77ea22021-12-02T13:58:15ZLow oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India10.1038/s41598-020-79152-x2045-2322https://doaj.org/article/716c244a807e4cb688583b4d3df77ea22020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79152-xhttps://doaj.org/toc/2045-2322Abstract 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.K. Diraviya RajG. MathewsDavid O. OburaR. L. LajuM. Selva BharathP. Dinesh KumarA. ArasamuthuT. K. Ashok KumarJ. K. Patterson EdwardNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-7 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q K. Diraviya Raj G. Mathews David O. Obura R. L. Laju M. Selva Bharath P. Dinesh Kumar A. Arasamuthu T. K. Ashok Kumar J. K. Patterson Edward Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India
description	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.
format	article
author	K. Diraviya Raj G. Mathews David O. Obura R. L. Laju M. Selva Bharath P. Dinesh Kumar A. Arasamuthu T. K. Ashok Kumar J. K. Patterson Edward
author_facet	K. Diraviya Raj G. Mathews David O. Obura R. L. Laju M. Selva Bharath P. Dinesh Kumar A. Arasamuthu T. K. Ashok Kumar J. K. Patterson Edward
author_sort	K. Diraviya Raj
title	Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India
title_short	Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India
title_full	Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India
title_fullStr	Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India
title_full_unstemmed	Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India
title_sort	low oxygen levels caused by noctiluca scintillans bloom kills corals in gulf of mannar, india
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/716c244a807e4cb688583b4d3df77ea2
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Low oxygen levels caused by Noctiluca scintillans bloom kills corals in Gulf of Mannar, India

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