Fish distributions in a tidal channel indicate the behavioural impact of a marine renewable energy installation
Fish distributions in a tidal channel indicate the behavioural impact of a marine renewable energy installation
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DOI：
10.1016/j.egyr.2018.01.008
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发表时间：
2018-11-01
期刊：
影响因子：
5.2
通讯作者：
Scott, Beth E.
中科院分区：
文献类型：
--
作者：
Fraser, Shaun;Williamson, Benjamin J.;Scott, Beth E.
在潮汐通道等海洋可再生能源开采的动态环境中，人们对鱼类的自然分布和海洋可再生能源设施的行为影响知之甚少。这项研究建立在最近的方法发展，揭示鱼群的行为，使用的数据收集的海底安装回声测深仪部署在极端的潮汐流，并在一个MREI（由一个全面的潮汐流能涡轮机的基础）。结果显示，与代表自然条件的附近对照位置相比，MREI附近鱼群的垂直分布发生了显着变化（p < 0.001）。MREI与鱼群观察的整体增加率（+ 74%）有关，特别是在夜间（+ 163%）和MREI尾流（+ 378%），与鱼群特征（大小，相对密度和距海底的距离）的自然昼夜行为模式的破坏有关。这些结果表明的MREI的吸引力的影响，并表明，在修改后的流量条件下的鱼的聚集和垂直分布是依赖于潮汐阶段的证据，避免在峰值流速的MREI的深度范围。本研究中观察到的行为反应为海洋可再生能源开发的环境影响评估提供了新的信息，并突出了进一步研究的优先事项。(C)2018作者由Elsevier Ltd.发布。这是CC BY许可下的开放获取文章。
In the dynamic environments targeted for marine renewable energy extraction, such as tidal channels, the natural distribution of fish and behavioural impacts of marine renewable energy installations (MREIs) are poorly understood. This study builds on recent methodological developments to reveal the behaviour of fish schools using data collected by a seabed-mounted echosounder deployed in extreme tidal flows and in the wake of a MREI (composed of the foundation of a full-scale tidal stream energy turbine). The results show a significant change (p < 0.001) in the vertical distribution of fish schools in the vicinity of a MREI compared to a nearby control location representative of the natural conditions. The MREI is associated with an overall increased rate of fish school observations (+ 74%), particularly at night (+ 163%) and in the MREI wake flow (+ 378%), related to the disruption of natural diurnal behavioural patterns in school characteristics (size, relative density, and distance from seabed). These results indicate an attraction effect of the MREI, and show that the aggregation and vertical distribution of fish in the modified flow conditions is dependent on tidal phase with evidence of avoidance of the MREI depth range during peak flow velocities. The behavioural responses observed in this study provide new information relevant to the environmental impact assessment of marine renewable energy developments and highlight priorities for further research. (C) 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.