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首页> 美国卫生研究院文献>Scientific Reports >Seasonal variation modulates coral sensibility to heat-stress and explains annual changes in coral productivity
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Seasonal variation modulates coral sensibility to heat-stress and explains annual changes in coral productivity

机译：季节性变化调节珊瑚对热应激的敏感性并解释珊瑚生产力的年度变化

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The potential effects of seasonal acclimatization on coral sensitivity to heat-stress, has received limited attention despite differing bleaching thresholds for summer and winter. In this study, we examined the response of two contrasting phenotypes, termed winter and summer, of four Caribbean reef corals to similar light and heat-stress levels. The four species investigated were categorized into two groups: species with the ability to harbour large number of symbionts, Orbicella annularis and O. faveolata, and species with reduced symbiont density (Montastraea cavernosa and Pseudodiploria strigosa). The first group showed higher capacity to enhance photosynthetic rates per area (Pmax), while Pmax enhancement in the second group was more dependent on Symbiodinium performance (Psym). In summer all four species presented higher productivity, but also higher sensitivity to lose coral photosynthesis under heat-stress. In contrast, corals in winter exhibit symbionts with higher capacity to photoacclimate to the increased levels of light-stress elicited by heat-stress. Overall, our study supports the importance of the acclimatory coral condition in addition to the previous thermal history, to determine the severity of the impact of heat-stress on coral physiology, but also the dependence of this response on the particular structural and functional traits of the species.
机译：尽管夏季和冬季的漂白阈值不同，但季节适应对珊瑚对热应激的敏感性的潜在影响受到了有限的关注。在这项研究中，我们研究了四种不同的表型对四种加勒比礁珊瑚的光照和热应力水平的响应，这两种表型分别称为冬季和夏季。所研究的四个物种分为两类：具有庇护大量共生体能力的物种：环形双歧杆菌和长叶O. faveolata，以及共生体密度降低的物种（Montastraea Cavernosa和Pseudodiploria strigosa）。第一组显示更高的能力来提高单位面积的光合速率（Pmax），而第二组的Pmax增强更多地取决于Symbiodinium的性能（Psym）。在夏季，这四个物种都表现出更高的生产力，但在高温胁迫下丧失珊瑚光合作用的敏感性也更高。相比之下，冬季的珊瑚表现出更高的共生能力，能够适应由热胁迫引起的轻度胁迫。总的来说，我们的研究支持了适应性珊瑚条件的重要性，除了以前的热史以外，还可以确定热应激对珊瑚生理的影响的严重性，而且还取决于这种反应对珊瑚特定结构和功能性状的依赖性。该物种。

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