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首页> 外文期刊>Marine ecology progress series >Incident light on mesophotic corals is constrained by reef topography and colony morphology
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Incident light on mesophotic corals is constrained by reef topography and colony morphology

机译：患肠球菌珊瑚的入射光受珊瑚礁形貌和菌落形态的约束

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摘要

Mesophotic coral reefs, generally defined as deep reefs between 30 and 150 m, are found worldwide and are largely structured by changes in the underwater light field. Additionally, it is increasingly understood that reef-to-reef variability in topography, combined with quantitative and qualitative changes in the underwater light field with increasing depth, significantly influence the observed changes in coral distribution and abundance. Here, we take a modeling approach to examine the effects of the inherent optical properties of the water column on the irradiance that corals are exposed to along a shallow to mesophotic depth gradient. In particular, the roles of reef topography including horizontal, sloping and vertical substrates are quantified, as well as the differences between mounding, plating and branching colony morphologies. Downwelling irradiance and reef topography interact such that for a water mass of similar optical properties, the irradiance reaching the benthos varies significantly with topography (i.e. substrate angle). Coral morphology, however, is also a factor; model results show that isolated hemispherical colonies consistently `see' greater incident irradiances across depths, and throughout the day, compared to plating and branching morphologies. These modeled geometric-based differences in the incident irradiances on different coral morphologies are not, however, consistent with actual depth-dependent distributions of these coral morphotypes, where plating morphologies dominate as you go deeper. Other factors, such as the cost of calcification, arguably contribute to these differences, but irradiance-driven patterns are a strong proximate cause for the observed differences in mesophotic communities on sloping versus vertical reef substrates.
机译：通常定义为30到150米之间的深珊瑚礁的中间光学珊瑚礁，在全球范围内发现，并且主要由水下光场的变化来构成。另外，越来越明确地理解地形中的Reef-to-Reef可变性，与水下光场中的定量和定性变化相结合，随着深度的增加，显着影响观察到的珊瑚分布和丰度的变化。在这里，我们采用建模方法来检查水柱固有光学性质对珊瑚暴露于浅层至中间光学深度梯度的辐照度的影响。特别地，量化了包括水平，倾斜和垂直基材的Reef形貌的作用，以及墩，电镀和分支菌落形态之间的差异。沉船辐照度和珊瑚礁形貌相互作用，使得对于类似光学性质的水质量，达到Benthos的辐照度随着地形（即衬底角）而显着变化。然而，珊瑚形态也是一个因素;模型结果表明，与电镀和分支形态相比，孤立半球形殖民地始终如一地“看到”跨越深度的侵略性更大的恐怖症“。然而，在不同珊瑚形态上的事件辐照上的这些基于模型的几何差异并不一致，与这些珊瑚morphotypes的实际深度依赖性分布一致，其中电镀形态在您深入占主导地位。其他因素，例如钙化成本，可以有助于这些差异，但是辐照度驱动的模式是对倾斜与垂直礁衬底的患者社区的观察到差异的强烈近似原因。

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