Short-Term Response of Deep-Water Benthic Megafauna to Installation of a Pipeline Over a Depth Gradient on the Angolan Slope
Short-Term Response of Deep-Water Benthic Megafauna to Installation of a Pipeline Over a Depth Gradient on the Angolan Slope
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DOI：
10.3389/fmars.2022.880453
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Virginia Biede;A. Gates;Simone Pfeifer;J. Collins;C. Santos;Daniel O. B. Jones
中科院分区：
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作者：
Virginia Biede;A. Gates;Simone Pfeifer;J. Collins;C. Santos;Daniel O. B. Jones
大型结构物是通过若干工业活动，包括碳氢化合物开采，引入深水海洋环境的。人为结构可以改变许多海洋生态系统的生态系统结构和功能，但对大陆边的反应知之甚少。在这里，我们调查的短期反应的海底巨型动物的安哥拉边缘（块31）从700至1800米的水深，使用远程操作的车辆图像安装一个56公里长的30厘米直径的管道。2013年在管道安装之前观察到的巨型动物的密度、多样性和群落结构存在明显的深度相关模式。这些模式在管道安装后三个月的2014年后续调查中有所改变。观察到密度显著增加，特别是在中坡区域。2014年，多样性总体上得到加强，但并不一致，特别是在较浅的地区。不同年份之间，群落结构发生了明显变化。这些变化主要是由棘皮动物，特别是棘皮Phormosoma sp. indet的丰度增加引起的。在三个月内，没有证据表明管道被可见的动物群殖民。观察到的少数大型海葵附着在管道上，成年海葵可能能够移动。该管道似乎捕获有机物质和人为垃圾，并可能增加当地的可用食物资源，以及提供坚硬的底层。这些结果表明，复杂的和生态系统依赖的结构安装的反应，并对简单化的方法，以环境管理的警告。
Large structures are introduced into deep-water marine environments by several industrial activities, including hydrocarbon exploitation. Anthropogenic structures can alter ecosystem structure and functioning in many marine ecosystems but the responses on continental margins are poorly known. Here, we investigate the short-term response of benthic megafauna to the installation of a 56 km-long 30 cm diameter pipeline on the Angolan Margin (Block 31) from 700 to 1800 m water depth using remotely operated vehicle imagery. Clear depth-related patterns exist in the density, diversity and community structure of megafauna observed in 2013 prior to pipeline installation. These patterns are altered in a subsequent survey in 2014, three-months after pipeline installation. Significant increases in density, particularly in mid-slope regions are observed. Diversity is generally, but not consistently, enhanced, particularly in the shallower areas in 2014. Clear changes are noted in community structure between years. These changes are primarily caused by increases in the abundance of echinoderms, particularly the echinoid Phormosoma sp. indet. There was no evidence of colonisation of the pipeline in three months by visible fauna. The few large anemones observed attached to the pipe may be able to move as adults. The pipeline appeared to trap organic material and anthropogenic litter, and may enhance available food resources locally as well as providing hard substratum. These results indicate complex and ecosystem-dependent responses to structure installation and caution against simplistic approaches to environmental management.