Global community breaks at 60 m on mesophotic coral reefs
Global community breaks at 60 m on mesophotic coral reefs
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全球群落在中光珊瑚礁上 60 m 处断裂
DOI：
10.1111/geb.12940
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发表时间：
2019
影响因子：
6.4
通讯作者：
Pandolfi, ed., John
中科院分区：
文献类型：
--
作者：
Lesser, Michael P.;Slattery, Marc;Laverick, Jack H.;Macartney, Keir J.;Bridge, Tom C.;Pandolfi, ed., John
目的中栖珊瑚生态系统（MCEs）是一种独特的群落，它支持着与浅水珊瑚礁不同的大部分深度特有物种。然而，由于对这些群落的研究往往是特定地点的，目前对浅层和中厚层珊瑚礁之间以及上部和下部mce之间的界限几乎没有共识。在这里，我们研究了群落断裂的生态证据，这里定义为物种损失，在全球浅礁和MCEs之间的鱼类和底栖动物类群中。LocationGlobal mc。时间period1973 - 2017。研究的主要分类群有：大植物、多孔鱼、硬骨鱼、水螅鱼、章鱼鱼、棘鱼和硬骨鱼。方法基于对26项研究的meta分析，研究了不同的光自养和异养分类群，采用随机效应模型和断点分析对存在/缺失数据进行分析，确定了1-69 m深度梯度上物种损失高于预期的区域。然后，我们研究了环境因素（包括光、温度和养分可用性）在多大程度上可以解释高动物更替点。结果我们发现了一个群落断裂的证据，表明浅水分类群的大量损失，在~ 60 m处，在几个分类和功能不同的底栖生物群和地理区域。底栖生物组成的断点最好用光的减少来解释，这与表面辐照度的10%到1%之间的光学深度有关。在~ 60 m深度，营养物（溶解性和颗粒性有机物）的可用性同时发生变化，并从光自养型向异养型为主的组合转变。我们发现了在~ 60 m深度存在多个底栖生物类群的全球群落断裂的证据，表明群落在浅层和中深水珊瑚生态系统之间有明显的转变。水下光环境的变化和沿深度梯度的营养资源的可用性是对观察到的模式的最简洁的解释。
AimMesophotic coral ecosystems (MCEs) are unique communities that support a high proportion of depth‐endemic species distinct from shallow‐water coral reefs. However, there is currently little consensus on the boundaries between shallow and mesophotic coral reefs and between upper versus lower MCEs because studies of these communities are often site specific. Here, we examine the ecological evidence for community breaks, defined here as species loss, in fish and benthic taxa between shallow reefs and MCEs globally.LocationGlobal MCEs.Time period1973–2017.Major taxa studiedMacrophytes, Porifera, Scleractinia, Hydrozoa, Octocorallia, Antipatharia and teleost fishes.MethodsWe used random‐effects models and breakpoint analyses on presence/absence data to identify regions of higher than expected species loss along a depth gradient of 1–69 m, based on a meta‐analysis of 26 studies spanning diverse photoautotrophic and heterotrophic taxa. We then investigated the extent to which points of high faunal turnover can be explained by environmental factors, including light, temperature and nutrient availability.ResultsWe found evidence for a community break, indicated by a significant loss of shallow‐water taxa, at ~ 60 m across several taxonomically and functionally diverse benthic groups and geographical regions. The breakpoint in benthic composition is best explained by decreasing light, which is correlated with the optical depths between 10 and 1% of surface irradiance. A concurrent shift in the availability of nutrients, both dissolved and particulate organic matter, and a shift from photoautotroph to heterotroph‐dominated assemblages also occurs at ~ 60 m depth.Main conclusionsWe found evidence for global community breaks across multiple benthic taxa at ~ 60 m depth, indicative of distinct community transitions between shallow and mesophotic coral ecosystems. Changes in the underwater light environment and the availability of trophic resources along the depth gradient are the most parsimonious explanations for the observed patterns.
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10.1016/j.jembe.2005.07.010
发表时间：
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影响因子：
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作者：
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影响因子：
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DOI：
--
发表时间：
2000
期刊：
Evolution; international journal of organic evolution
影响因子：
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作者：
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通讯作者：
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