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首页> 外文期刊>Marine ecology progress series >Importance of the artificial light field around offshore petroleum platforms for the associated fish community
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Importance of the artificial light field around offshore petroleum platforms for the associated fish community

机译：海上石油平台周围人工鱼场对相关鱼类群落的重要性

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ABSTRACT: Offshore petroleum platforms in the northern Gulf of Mexico provide a unique environment for many reef-associated and pelagic fish species; however, the factors that contribute to increased localized fish abundance remain poorly quantified. All manned platforms possess large floodlights for nighttime operations and these also illuminate the surrounding waters. Two platforms (MC582 and ST151), located off the Louisiana coast, were examined to quantify this artificial light field. A multi-spectral radiometer instrument package was used to record subsurface irradiance along a regularly spaced grid around each platform. Spectral patterns indicated that the predominant source of underwater light near MC582 was the natural gas flare, while floodlights predominated in the water beneath ST151. Irradiance profiles (log10 photosynthetically active radiation) indicated that 10 to 1000 times more light was present near the platforms compared to open water control sites and that light levels decreased with increasing depth. Irradiance values were interpolated to estimate the 3-dimensional underwater light field and volumes were constructed based on published visual thresholds for 3 larval/juvenile fish taxa. Results suggest that platforms provide an enhanced foraging environment for larval, juvenile and adult fishes by providing sufficient light to locate and capture prey, as well as by attracting and concentrating positively phototaxic prey taxa.
机译：摘要：墨西哥湾北部的海上石油平台为许多与珊瑚礁相关的鱼类和中上层鱼类提供了独特的环境;但是，导致局部鱼类丰度增加的因素仍然难以量化。所有载人平台均配有大型泛光灯，可在夜间进行操作，并且还能照亮周围的水域。检查了位于路易斯安那州海岸外的两个平台（MC582和ST151）以量化此人造光场。使用多光谱辐射计仪器套件记录沿每个平台周围规则间隔的网格的地下辐照度。光谱图表明，MC582附近的主要水下光源是天然气火炬，而ST151以下的水中则主要是泛光灯。辐照度分布（log 10 光合有效辐射）表明，与开放水域控制场所相比，平台附近存在的光多10到1000倍，并且光照强度随深度的增加而降低。对辐照度值进行插值以估计3维水下光场，并根据已发布的3种幼体/幼鱼类目的视觉阈值构建体积。结果表明，平台通过提供足够的光线来定位和捕获猎物，以及通过吸引和集中正光致化的猎物类群，为幼鱼，幼鱼和成年鱼提供了更好的觅食环境。

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