Aim: Mass bleaching is a major threat to reef-building corals and the ecosystems they underpin. Here, we identified regional variation in the nature of this threat in terms of the bleaching-susceptibility of individual coral species on some Indian Ocean and Pacific Ocean reefs. Location: 22 sites in the central Great Barrier Reef, Australia (GBR) and 30 sites in the central Maldives Archipelago (MA). Time period: 2002 for the GBR and 2016 for the MA. Major taxa studied: Corals (Order Scleractinia). Methods: Following marine heat-wave conditions, timed in-situ surveys were used to record bleaching responses (tissue colour) of large samples of individual coral colonies. Responses of 106 shared species were analysed for sites with similar levels of temperature stress, depth of occurrence and mortality. In each region, phylogenetic mixed models were used to partition the effects on responses of species of deep-time phylogeny, contemporary history and local-scale, among-site variability. Results: Relative susceptibility to bleaching varied widely between regions: only 27 of the 106 shared species were in the same quartile for relative susceptibility in both regions. Few species were highly susceptible in both regions. Closely related species varied widely in their individual susceptibilities. Phylogenetic effects were moderate in both regions, but contemporary phenotypic effects indicative of recent evolution and acclimatization were greater in the MA, consistent with a stronger history of recent bleaching. Main conclusions: The high regional and intra-generic variation in coral bleaching-susceptibility described here suggests there may be important differences in the extent to which these Indian and Pacific Ocean coral populations are exhibiting responses to deep-time evolutionary changes on the one hand, versus recent adaptation, on the other. There is a concerning scarcity of this type of data, by which coral species most at risk from bleaching in particular regions may be more accurately identified.

中文翻译：

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印度洋-太平洋珊瑚物种对大规模漂白的敏感性较高的区域和种内差异

目的：大规模漂白是对造礁珊瑚及其基础生态系统的主要威胁。在这里，我们从印度洋和太平洋珊瑚礁上单个珊瑚物种的漂白敏感性确定了这种威胁的性质的区域差异。位置：澳大利亚大堡礁（GBR）中心的22个地点，马尔代夫群岛（MA）中心的30个地点。时间段：GBR为2002，MA为2016。研究的主要分类单元：珊瑚（Scleractinia）。方法：根据海洋热浪条件，使用定时的原位调查来记录单个珊瑚群落大样本的漂白反应（组织颜色）。分析了106种共有物种的响应，以分析温度应力，发生深度和死亡率相似的地点。在每个地区 系统发育混合模型用于划分对深层系统发育物种，当代历史和局部规模，站点间变异性的响应的影响。结果：各地区的相对漂白敏感性差异很大：在这两个地区，106种共有物种中只有27种处于同一四分位数。在这两个地区，很少有物种高度易感。密切相关的物种在其个体敏感性方面差异很大。在这两个地区，系统发生作用均中等，但表明最近进化和适应的现代表型效应在马萨诸塞州更大，这与最近漂白的历史更为一致。主要结论：这里描述的珊瑚白化敏感性的区域和种内差异很大，这表明这些印度和太平洋珊瑚种群一方面表现出对深度演化变化的反应，另一方面与最近的适应变化可能存在重要差异。 ， 在另一。这种类型的数据令人担忧，因为在这种情况下，可以更准确地确定在特定区域遭受漂白风险最大的珊瑚物种。