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The behavioural variation of bottlenose dolphins in Montenegro.

The behavioural variation of bottlenose dolphins in Montenegro.

Source publication
Technical Report
Full-text available
Five cetacean species are known to inhabit the Adriatic Sea. While bottlenose dolphins (Tursiops truncatus) are the most commonly reported species of the Adriatic, they show mainly coastal distribution from its southern to the northern boundaries. On the other hand, striped dolphins (Stenella coeruleoalba), Risso’s dolphins (Grampus griseus) and Cu...

Context in source publication

Context 1
... group scan sampling of bottlenose dolphins revealed that the dominant behaviour recorded in Montenegro was diving, forming 35% of the total recordings, followed by travelling behaviour, making up 26% of recordings. Bow-riding was the least reported behaviour when combined with interaction with marine vessels formed 3% of the total recordings, which is equal to the reported resting behaviour ( Figure 6). Striped dolphins also showed similar behavioural patterns with diving forming 22% of the reported behaviours followed by traveling (19%), travel-diving (18%) and surface feeding (16%). ...

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Citations

Article
The spatial–temporal distribution of cetacean species often overlaps with fishing practices in the Mediterranean, having direct and indirect consequences. This is the first long‐term study focusing on the effects of fisheries on the behavior of T. truncatus in Montenegro. Focal group scan sampling was used during surveys between September 2016 and August 2020 to create transition probability matrices using first‐order Markov chains for behavioral states in both control (absence of fishery practices) and impact chains (presence of fishery practices). Despite the low number of dolphin‐fishery interactions in Montenegro, results revealed that the behavioral budgets of T. truncatus were significantly altered both for commercial and artisanal fisheries. However, the magnitude of the threat differed between practices, with commercial fisheries altering three out of the four behaviors in the behavioral budget while artisanal fisheries altered just one. Significant behavioral changes due to disturbance can have negative consequences on the energy budget of individuals and while the Montenegrin fishing fleet is currently limited to 224 vessels, the significant effects already witnessed are concerning for Montenegrin bottlenose dolphins. To develop in‐situ mitigation strategies, there is a clear need to better understand the impact that fisheries interactions have on these individuals.