Human-induced shifts in habitat use and behaviour of a marine predator: the effects of bait provisioning in the blacktip reef shark,Animal Conservation

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Human-induced shifts in habitat use and behaviour of a marine predator: the effects of bait provisioning in the blacktip reef shark
Animal Conservation ( IF 2.8 ) Pub Date : 2020-08-09 , DOI: 10.1111/acv.12630
J. Mourier _{1,

2,

3} , J. Claudet _{2,

4} , S. Planes _{1,

2}

Affiliation

While the negative effects of consumptive pressures on marine predators are well established, the effects of increasing non‐consumptive activities such as wildlife tourism are still understudied. As such, the long‐term effects of the provision of bait on shark behaviour are still unclear. Here, we assessed the effects of provisioning using a Control‐Impact design on the spatial use and level of residency of the blacktip reef shark Carcharhinus melanopterus over a 2‐year period. We used effect sizes to model the relative changes in residency between provisioning and non‐provisioning sites. Sharks showed a high degree of residency and significant changes in their habitat use which persisted overnight while the activity ceased. We suggest that provisioning activities can affect species with high level of residency such as the blacktip reef shark. Further research is needed to better understand how these behavioural modifications can alter the fitness of this species. It is important to adapt shark provisioning activities to limit the induced changes in habitat use.

中文翻译：

人类引起的海洋捕食者栖息地利用和行为的变化：黑鳍礁鲨提供诱饵的影响

虽然消费压力对海洋捕食者的负面影响已经确立，但野生动物旅游等非消费活动增加的影响仍未得到充分研究。因此，提供诱饵对鲨鱼行为的长期影响尚不清楚。在这里，我们使用控制影响设计评估了供应对黑鳍礁鲨 Carcharhinus melanopterus 在 2 年期间的空间使用和居住水平的影响。我们使用效果大小来模拟供应和非供应站点之间驻留的相对变化。鲨鱼表现出高度的栖息地和栖息地用途的重大变化，这些变化在活动停止时持续了一夜。我们建议供应活动会影响具有高居住水平的物种，例如黑鳍礁鲨。需要进一步研究以更好地了解这些行为改变如何改变该物种的适应性。调整鲨鱼供应活动以限制栖息地使用的诱导变化非常重要。

更新日期：2020-08-09

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