Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.

Coral bleaching occurs when environmental stress induces breakdown of the coral-algae symbiosis and the host initiates algae expulsion. Two types of coral bleaching had been thoroughly discussed in the scientific literature; the first is primarily associated with mass coral bleaching events; the sec...

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Autores principales:	Orit Nir, David F Gruber, Eli Shemesh, Eliezra Glasser, Dan Tchernov
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c866d0dc2519459dadf1aa46fa9ca3dd
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spelling	oai:doaj.org-article:c866d0dc2519459dadf1aa46fa9ca3dd2021-11-18T08:37:44ZSeasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.1932-620310.1371/journal.pone.0084968https://doaj.org/article/c866d0dc2519459dadf1aa46fa9ca3dd2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24454772/?tool=EBIhttps://doaj.org/toc/1932-6203Coral bleaching occurs when environmental stress induces breakdown of the coral-algae symbiosis and the host initiates algae expulsion. Two types of coral bleaching had been thoroughly discussed in the scientific literature; the first is primarily associated with mass coral bleaching events; the second is a seasonal loss of algae and/or pigments. Here, we describe a phenomenon that has been witnessed for repeated summers in the mesophotic zone (40-63 m) in the northern Red Sea: seasonal bleaching and recovery of several hermatypic coral species. In this study, we followed the recurring bleaching process of the common coral Stylophora pistillata. Bleaching occurred from April to September with a 66% decline in chlorophyll a concentration, while recovery began in October. Using aquarium and transplantation experiments, we explored environmental factors such as temperature, photon flux density and heterotrophic food availability. Our experiments and observations did not yield one single factor, alone, responsible for the seasonal bleaching. The dinoflagellate symbionts (of the genus Symbiodinium) in shallow (5 m) Stylophora pistillata were found to have a net photosynthetic rate of 56.98-92.19 µmol O2 cm(-2) day(-1). However, those from mesophotic depth (60 m) during months when they are not bleached are net consumers of oxygen having a net photosynthetic rate between -12.86 - (-10.24) µmol O2 cm(-2) day(-1). But during months when these mesophotic corals are partially-bleached, they yielded higher net production, between -2.83-0.76 µmol O2 cm(-2) day(-1). This study opens research questions as to why mesophotic zooxanthellae are more successfully meeting the corals metabolic requirements when Chl a concentration decreases by over 60% during summer and early fall.Orit NirDavid F GruberEli ShemeshEliezra GlasserDan TchernovPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 1, p e84968 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Orit Nir David F Gruber Eli Shemesh Eliezra Glasser Dan Tchernov Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.
description	Coral bleaching occurs when environmental stress induces breakdown of the coral-algae symbiosis and the host initiates algae expulsion. Two types of coral bleaching had been thoroughly discussed in the scientific literature; the first is primarily associated with mass coral bleaching events; the second is a seasonal loss of algae and/or pigments. Here, we describe a phenomenon that has been witnessed for repeated summers in the mesophotic zone (40-63 m) in the northern Red Sea: seasonal bleaching and recovery of several hermatypic coral species. In this study, we followed the recurring bleaching process of the common coral Stylophora pistillata. Bleaching occurred from April to September with a 66% decline in chlorophyll a concentration, while recovery began in October. Using aquarium and transplantation experiments, we explored environmental factors such as temperature, photon flux density and heterotrophic food availability. Our experiments and observations did not yield one single factor, alone, responsible for the seasonal bleaching. The dinoflagellate symbionts (of the genus Symbiodinium) in shallow (5 m) Stylophora pistillata were found to have a net photosynthetic rate of 56.98-92.19 µmol O2 cm(-2) day(-1). However, those from mesophotic depth (60 m) during months when they are not bleached are net consumers of oxygen having a net photosynthetic rate between -12.86 - (-10.24) µmol O2 cm(-2) day(-1). But during months when these mesophotic corals are partially-bleached, they yielded higher net production, between -2.83-0.76 µmol O2 cm(-2) day(-1). This study opens research questions as to why mesophotic zooxanthellae are more successfully meeting the corals metabolic requirements when Chl a concentration decreases by over 60% during summer and early fall.
format	article
author	Orit Nir David F Gruber Eli Shemesh Eliezra Glasser Dan Tchernov
author_facet	Orit Nir David F Gruber Eli Shemesh Eliezra Glasser Dan Tchernov
author_sort	Orit Nir
title	Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.
title_short	Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.
title_full	Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.
title_fullStr	Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.
title_full_unstemmed	Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.
title_sort	seasonal mesophotic coral bleaching of stylophora pistillata in the northern red sea.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/c866d0dc2519459dadf1aa46fa9ca3dd
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Seasonal mesophotic coral bleaching of Stylophora pistillata in the Northern Red Sea.

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