Effects of geography, taxa, water flow, and temperature variation on coral bleaching intensity in Mauritius
Effects of geography, taxa, water flow, and temperature variation on coral bleaching intensity in Mauritius
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DOI：
10.3354/meps298131
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Baker, AC
中科院分区：
文献类型：
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作者：
McClanahan, TR;Maina, J;Baker, AC
这项研究描述了15个地点的常见珊瑚分类群对2004年3月毛里求斯暖水异常的反应。由于当地水流模式的变化，岛屿周围的地点在水流和热史上有所不同。我们观察到珊瑚类群对异常的两个明显的正响应，与它们的局部丰度相关，一组稀疏(22个类群覆盖5 cm m(-1))和丰富的类群(7个类群覆盖>；5 cm m(-1))。在丰富类群中最敏感的属是顶孢霉和蒙蒂孢属，而在稀疏类群中最敏感的属是Seriatopora和Alveopora。这表明，足以导致死亡的温度异常将从群落谱中的2个位置移走分类群，从而对生态功能和多样性造成影响。我们发现，这些地点的漂白强度与水流呈正相关，在迎风和近海地点漂白最强烈，洋流最大。在岛两侧和2个深度采样的几乎所有珊瑚中的藻类共生体群落都以分支C中的多样性共生菌为主，这表明所观察到的珊瑚类群和地点之间的响应差异不太可能受到它们所含共生体类型的很大影响。我们认为，高流量减少了背景压力和适应能力，导致珊瑚对罕见的温度异常的耐受性较差。
This study describes the response of common coral taxa at 15 sites to a warm-water anomaly in Mauritius in March 2004. Sites circumscribed the island and differed in their water flow and thermal history as a result of variation in local current patterns. We observed 2 distinct positive responses of coral taxa to the anomaly that correlated with their local abundance, with a group of sparse (22 taxa covering < 5 cm m(-1)) and abundant taxa (7 taxa covering > 5 cm m(-1)). The 2 most dominant taxa Acropora and Montipora were among the most susceptible genera in the abundant group, while Seriatopora and Alveopora were the most susceptible taxa in the sparse group. This suggests that a temperature anomaly that is sufficient to cause mortality will remove taxa from 2 positions in the community spectrum with consequences for both ecological functions and diversity. We found that bleaching intensity at the sites was positively associated with water flow, with the most intense bleaching and highest currents on the windward and offshore sites. The algal symbiont communities in nearly all of the corals sampled on both sides of the island and 2 depths were dominated by diverse Symbiodinium in Clade C, indicating that the observed differences in response among coral taxa and sites were unlikely to be greatly affected by the types of symbionts they contained. We suggest that high water flow reduces background stress and acclimation, and results in corals that are less tolerant of rare temperature anomalies.