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首页> 外文期刊>Marine ecology progress series >Effect of boat noise on the behaviour of bluefin tuna Thunnus thynnus in the Mediterranean Sea
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Effect of boat noise on the behaviour of bluefin tuna Thunnus thynnus in the Mediterranean Sea

机译：船噪声对地中海蓝鳍金枪鱼Thunnus thynnus行为的影响

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The effect of boat noise on the behaviour of bluefin tuna Thunnus thynnus was investigated in the Egadi Islands, Sicily, during spring 2005 using a fixed tuna trap set near shipping routes. Tuna behaviour was observed when exposed to both natural ambient sound and sound generated by hydrofoil passenger ferries, small boats and large car ferries. Acoustical and behavioural analyses were conducted with and without extraneous sound to define a list of behavioural categories. Each vessel produced different engine sounds with regard to their composition and bandwidth, and all were distinctly different from ambient sound levels. In the absence of boat noise, tuna assumed a concentrated coordinated school structure with unidirectional swimming and without a precise shape. When a car ferry approached, tuna changed swimming direction and increased their vertical movement toward surface or bottom; the school exhibited an unconcentrated structure and uncoordinated swimming behaviour. Hydrofoils appeared to elicit a similar response, but for shorter periods. Agonistic behaviour was more evident when exposed to sounds from outboard motors of small boats. This study showed that local noise pollution generated by boats produced behavioural deviations in tuna schools. Schooling enhances tuna homing accuracy during their spawning migration, and an alteration in schooling behaviour can affect the accuracy of their migration to spawning and feeding grounds.
机译：2005年春季，在靠近航线的固定金枪鱼诱集装置上，在西西里岛的埃加迪群岛上研究了船噪声对蓝鳍金枪鱼Thunnus thynnus行为的影响。当暴露于自然环境声和水翼客运渡轮，小船和大型汽车渡轮产生的声音时，金枪鱼的行为被观察到。在有无声音的情况下进行声学和行为分析，以定义行为类别列表。每艘船在其成分和带宽方面均产生不同的发动机声音，并且与周围的声音水平明显不同。在没有船声的情况下，金枪鱼假定为集中协调的学校结构，具有单向游泳且没有精确的形状。当靠近汽车渡轮时，金枪鱼改变了游泳方向，并增加了其向水面或水底的垂直运动；这所学校展示了一种不集中的结构和不协调的游泳行为。水翼似乎引起了类似的反应，但是持续时间较短。当暴露于小船舷外发动机的声音时，激动行为更为明显。这项研究表明，船上产生的局部噪声污染在金枪鱼学校造成了行为偏差。放学可以提高金枪鱼产卵迁徙过程中的归巢精度，并且改变学习行为会影响金枪鱼向产卵场和觅食场迁移的准确性。

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