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White shark behaviour altered by stranded whale carcasses: Insights from drones and implications for beach management
Ocean & Coastal Management ( IF 4.6 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ocecoaman.2020.105477
James P. Tucker , Andrew P. Colefax , Isaac R. Santos , Brendan P. Kelaher , Daniel E. Pagendam , Paul A. Butcher

Abstract White sharks (Carcharodon carcharias) are attracted to and scavenge on floating whale carcasses. However, little is known about how stranded whale carcasses may affect their behaviour. With increasing whale populations and beach stranding events, sharks may be attracted to nearshore waters at carcass sites, increasing the potential conflict with human use. Here, we used aerial drones to assess whether white shark behaviour around stranded whale carcasses differs from their behaviour away from carcasses. We quantified white shark behaviour by measuring swim speed, net velocity, straightness and sinuosity of shark tracks, as well as the total length of each shark. White sharks in the vicinity of whale carcasses travelled at 0.46 m s−1 (±0.06 SD) faster, were 0.26 m (±0.15 SD) longer, swam tracks that were 0.15 (±0.11 SD) lower on the straightness index, and showed more sinuous tracks by 0.07 (±0.02 SD), compared to sharks away from a carcass. The presence of a stranded whale carcass may, therefore, significantly altered the behaviour and size of white sharks close to shore. As white shark activity increases in a relatively small nearshore area, which was indicated by decreased straightness and increased sinuosity, there may be an elevated risk of shark interactions with water users in the vicinity of stranded whale carcasses.

中文翻译:

搁浅的鲸鱼尸体改变了白鲨的行为:来自无人机的见解和对海滩管理的影响

摘要 白鲨(Carcharodon carcharias)被漂浮的鲸鱼尸体所吸引并以它们为食。然而,人们对搁浅的鲸鱼尸体如何影响它们的行为知之甚少。随着鲸鱼数量的增加和海滩搁浅事件​​的增加,鲨鱼可能会被吸引到尸体地点的近岸水域,从而增加与人类使用的潜在冲突。在这里,我们使用空中无人机来评估白鲨在搁浅鲸鱼尸体周围的行为是否与它们远离尸体的行为不同。我们通过测量鲨鱼的游泳速度、净速度、直线度和弯曲度以及每条鲨鱼的总长度来量化白鲨的行为。鲸鱼尸体附近的白鲨以 0.46 m s−1 (±0.06 SD) 的速度行进,长了 0.26 m (±0.15 SD),游动轨迹为 0.15 (±0.06 SD)。11 SD) 的直线度指数较低,并且与远离尸体的鲨鱼相比,显示出更多的弯曲轨迹 0.07 (±0.02 SD)。因此,搁浅的鲸鱼尸体的存在可能会显着改变靠近海岸的白鲨的行为和大小。由于白鲨活动在相对较小的近岸区域增加,这表现为直线度降低和弯曲度增加,因此鲨鱼与搁浅鲸鱼尸体附近的水用户互动的风险可能会增加。
更新日期:2021-02-01
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