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首页> 外文期刊>Marine ecology progress series >Reef structure regulates small-scale spatial variation in coral bleaching
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Reef structure regulates small-scale spatial variation in coral bleaching

机译：珊瑚礁结构调节珊瑚褪色的小范围空间变化

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ABSTRACT: Coral bleaching is often characterized by high spatial variation across reef systems. Using a field survey and manipulative experiment, we tested whether the physical structure of coral reefs modifies environmental conditions that, in turn, influence spatial variation in bleaching in 3 scleractinian corals, Pocillopora verrucosa, Acropora elseyi, and Porites rus. Corals inhabit mainly the hard-bottom seafloor, or dead or partially dead coral heads (‘bommies’). Bommies (0.10 to 3.0 m tall) position corals at different water depths and expose them to differences in light, temperature, hydrodynamics, and sedimentation, factors that can influence patterns of bleaching. We conducted our study in association with a 14 d warming event that caused bleaching in lagoons of Moorea, French Polynesia. Bleaching in naturally occurring colonies of Pocillopora spp. and Acopora spp. was greater on the seafloor (0 m tall) than on short (0.35 to 0.40 m tall) and tall bommies (1.0 to 1.2 m tall). Bleaching in P. verrucosa and A. elseyi transplanted to reef structures in the experiment generally decreased with increasing reef height (seafloor short bommies tall bommies). P. rus did not bleach under any conditions observed. Regression analyses revealed that reef structure controlled current speed and sedimentation at the microhabitat scale (from centimeters to meters), and that these factors regulated bleaching and mortality in P. verrucosa and A. elseyi. Our results imply that the physical structure of shallow water reef habitat influences the performance of coral colonies by modifying environmental stress, and that accounting for this structure is important in managing coral reef systems.
机译：摘要：珊瑚白化的特点通常是整个珊瑚礁系统的空间变化很大。通过现场调查和操作性实验，我们测试了珊瑚礁的物理结构是否改变了环境条件，进而影响了3个巩膜珊瑚（i.Pocillopora verrucosa ， Acropora elseyi）漂白过程中的空间变化和 Porites rus 。珊瑚主要栖息在坚硬的海底或死去或部分死去的珊瑚头（“僵尸”）。尸体（高0.10至3.0 m）将珊瑚置于不同的水深处，并使它们暴露在光线，温度，流体动力学和沉积的差异中，这些因素可能影响漂白的方式。我们进行了与14天变暖事件相关的研究，该事件导致法属波利尼西亚Moorea的泻湖发生漂白。在 Pocillopora spp的天然菌落中漂白。和 Acopora spp。在海底（0 m高）上比在矮个（0.35至0.40 m高）和高个体（1.0至1.2 m高）上更大。在 P中漂白。疣状皮肤和 A。在实验中，移植到礁石结构中的elseyi通常会随着礁石高度的增加而降低（海底>矮矮胖体>高矮矮胖体）。 P rus 在任何观察到的条件下均未漂白。回归分析表明，礁结构控制着微生境尺度（从厘米到米）的当前速度和沉积，这些因素调节了磷的漂白和死亡率。疣状皮肤和 A。 elseyi 。我们的结果表明，浅水礁栖息地的物理结构会通过改变环境压力来影响珊瑚群落的性能，并且说明这种结构对于管理珊瑚礁系统非常重要。

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