Distributions of stress-resistant coral symbionts match environmental patterns at local but not regional scales
Distributions of stress-resistant coral symbionts match environmental patterns at local but not regional scales
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DOI：
10.3354/meps07871
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发表时间：
2009-01-01
影响因子：
2.5
通讯作者：
Palumbi, Stephen R.
中科院分区：
文献类型：
--
作者：
Oliver, Thomas A.;Palumbi, Stephen R.
耐压珊瑚共生体的分布模式表明，最高栖息地温度可以推动共生体种群的局部尺度适应，但在区域尺度上，其他过程可能占主导地位。我们分析了来自美属萨摩亚、斐济、菲律宾和帕尔米拉环礁的 2 种密切相关的珊瑚的共生体的进化枝成员。耐温度胁迫的 D 类共生体在美属萨摩亚 (83%) 的出现频率高于帕尔米拉、斐济或菲律宾 (< 1%)。在美属萨摩亚，D 型共生体在最高温度较高的栖息地中占主导地位，而 C 型和 D 型在较低最高温度下都很常见。虽然美属萨摩亚的珊瑚表现出更耐压的共生体，但该地区并没有表现出比其他 3 个地区更高的海面温度、更多的加热异常记录或更多的白化现象。这些局部模式在区域上并不成立，这表明其他因素在驱动珊瑚共生体分布方面的重要性，包括宿主反应、其他环境相关因素、进化枝内的生理多样性和扩散限制。
Distribution patterns of stress-tolerant coral symbionts suggest that maximum habitat temperatures can drive local scale adaptation of symbiont populations, but at regional scales other processes can dominate. We assayed clade membership for symbionts of 2 closely related corals from American Samoa, Fiji, the Philippines and Palmyra Atoll. Temperature stress-tolerant Clade D symbionts occur more frequently in American Samoa (83%) than in Palmyra, Fiji or the Philippines (< 1%). In American Samoa, Clade D symbionts dominate habitats with higher maximum temperatures, while Clades C and D are both common under lower maximum temperatures. While corals in American Samoa show more stress-tolerant symbionts, this region does not exhibit higher sea surface temperatures, a greater record of heating anomalies or more bleaching than the other 3 regions. That these local patterns do not hold regionally suggests the importance of other factors, including host responses, other environmental correlates, within-clade physiological diversity and dispersal limitation, in driving the distribution of coral symbionts.