Evidence for mitigation of coral bleaching by manganese.
Evidence for mitigation of coral bleaching by manganese.
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DOI：
10.1038/s41598-018-34994-4
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发表时间：
2018-11-14
影响因子：
4.6
通讯作者：
Houlbrèque F
中科院分区：
文献类型：
--
作者：
Biscéré T;Ferrier-Pagès C;Gilbert A;Pichler T;Houlbrèque F
在过去的几十年里，由于全球变暖和整体海水污染，全世界都观察到了前所未有的大规模珊瑚白化事件。尽管金属通常被认为是珊瑚的有毒物质，但一些金属在纳摩尔浓度下对于光合作用和抗氧化防御等生理过程是必不可少的。本研究旨在阐明在正常生长和热胁迫条件下，纳米分子海水富集锰(Mn)和铁(Fe)对海鞘主要生理特性的单独和联合影响。我们首次提供了证据表明，在环境温度下，锰是珊瑚共生体的关键微量元素，可以提高细胞的叶绿素浓度、光合作用效率和总光合作用速率。我们的实验还强调了锰在提高珊瑚对热应激诱导的漂白的抵抗力方面的关键作用。虽然富锰珊瑚没有漂白，也没有降低光合作用和钙化的速度，但对照珊瑚经历了显著的漂白。与锰相反，富铁不仅削弱了钙化作用，而且导致了明显的漂白。这些信息是朝着更好地了解珊瑚对海水中金属富集物的反应迈出的重要一步。这在一定程度上也可以解释物种对环境胁迫的敏感性。
Unprecedented mass coral bleaching events due to global warming and overall seawater pollution have been observed worldwide over the last decades. Although metals are often considered as toxic substances for corals, some are essential at nanomolar concentrations for physiological processes such as photosynthesis and antioxidant defenses. This study was designed to elucidate, the individual and combined effects of nanomolar seawater enrichment in manganese (Mn) and iron (Fe), on the main physiological traits of Stylophora pistillata, maintained under normal growth and thermal stress conditions. We provide, for the first time, evidence that Mn is a key trace element for coral symbionts, enhancing cellular chlorophyll concentrations, photosynthetic efficiency and gross photosynthetic rates at ambient temperature. Our experiment also highlights the key role of Mn in increasing coral resistance to heat stress-induced bleaching. While Mn-enriched corals did not bleach and did not reduce their rates of photosynthesis and calcification, control corals experienced significant bleaching. On the contrary to Mn, Fe enrichment not only impaired calcification but induced significant bleaching. Such information is an important step towards a better understanding of the response of corals to seawater enrichment in metals. It can also explain, to some extent, species susceptibility to environmental stress.
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影响因子：
2.9
作者：
Hill, Ross;Ralph, Peter J.
通讯作者：
Ralph, Peter J.
影响因子：
3.7
作者：
Biscéré T;Rodolfo-Metalpa R;Lorrain A;Chauvaud L;Thébault J;Clavier J;Houlbrèque F
通讯作者：
Houlbrèque F
影响因子：
30.7
作者：
Cunning, Ross;Baker, Andrew C.
通讯作者：
Baker, Andrew C.
影响因子：
6.8
作者：
Gissi, Francesca;Stauber, Jenny;Jolley, Dianne F.
通讯作者：
Jolley, Dianne F.
影响因子：
5.8
作者：
GUZMAN, HM;JIMENEZ, CE
通讯作者：
JIMENEZ, CE