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Shark behaviour and marine faunal assemblage beneath SMART drumlines
Fisheries Research ( IF 2.2 ) Pub Date : 2021-08-19 , DOI: 10.1016/j.fishres.2021.106102
Rick D. Tate 1 , Brendan P. Kelaher 1 , Craig P. Brand 2 , Christopher R. Gallen 2 , Stephen D.A. Smith 1 , Paul A. Butcher 1, 2
Affiliation  

Over the last decade, an increase in the annual rate of shark bites on people has stimulated the development of new techniques aimed at reducing their occurrence, while minimising negative impacts to marine wildlife. One such technique is the SMART (Shark-Management-Alert-in-Real-Time) drumline, which allows for the capture and relocation of white sharks (Carcharodon carcharias), bull sharks (Carcharhinus leucas), and tiger sharks (Galeocerdo cuvier), the species responsible for most of the fatal shark bites on people. Over a 12-month period, we assessed the marine faunal assemblages observed in >1200 deployments of high-definition video cameras beneath SMART drumlines. Shark behaviours around SMART drumlines were also quantified. The faunal assemblage around the SMART drumlines was characterised by low richness, dominated by schooling bait fish, and influenced by sea surface temperature. Few non-target species of conservation concern (e.g. sea turtles, hammerhead sharks, or critically endangered greynurse sharks) were observed. Of the sharks approaching the drumlines, white sharks were more likely to bite and subsequently remove bait, leading to more instances of successful capture and release, and a greater rate of depredation. However, instances of depredation during the program were low and only occurred in 13 % of all shark bite interactions. Our results provide support for the use of SMART drumlines as an efficient tool for catching target shark species with minimal impact on non-target fauna.



中文翻译:

SMART 鼓声下的鲨鱼行为和海洋动物群落

在过去十年中,鲨鱼咬伤人的年率不断上升,刺激了旨在减少其发生的新技术的发展,同时最大限度地减少对海洋野生动物的负面影响。其中一种技术是 SMART(Shark-Management-Alert-in-Time)鼓线,它允许捕获和重新定位白鲨(Carcharodon carcharias)、牛鲨(Carcharhinus leucas)和虎鲨(Galeocerdo cuvier),大多数致命的鲨鱼咬人事件都是由这种物种造成的。在 12 个月的时间里,我们评估了在 SMART 鼓线下部署的超过 1200 部高清摄像机中观察到的海洋动物群落。SMART 鼓线周围的鲨鱼行为也被量化。SMART 鼓线周围的动物群落的特点是丰富度低,以诱饵鱼为主,并受海面温度的影响。几乎没有观察到保护问题的非目标物种(例如海龟、双髻鲨或极度濒危的灰鲨)。在接近鼓线的鲨鱼中,白鲨更有可能咬人并随后去除诱饵,从而导致更多成功捕获和释放的实例以及更大的掠夺率。然而,计划期间的掠夺事件很少,仅发生在所有鲨鱼咬伤互动中的 13%。我们的结果为使用 SMART 鼓线作为捕捉目标鲨鱼物种的有效工具提供了支持,同时对非目标动物群的影响最小。

更新日期:2021-08-20
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