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Survey Area of Montenegro with land station and boat survey coverages.

Survey Area of Montenegro with land station and boat survey coverages.

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...

Contexts in source publication

Context 1
... territorial waters of Montenegro were surveyed using a combination of fixed land stations and boat-based surveys since 2016 ( Figure 1). The land survey coverage was calculated using wedges for each land station. ...
Context 2
... total boat survey coverage was 5,069 km 2 with the furthest distance of 83.5 km from the nearest coast. The surveys were mainly conducted in shallow waters (<100m depth), the maximum depth that was surveyed reached to 1000 m depth (Figure 1). ...
Context 3
... cover all of the coastal waters of Montenegro, the project has nine predetermined locations along the Montenegrin coastline and in the Boka Kotorska Bay (Figure 1; Table 1). Every land survey location was carefully selected at least 10 metres above sea level with no obstructions such as trees or buildings blocking the line of sight. ...
Context 4
... entrance of Boka Kotorska Bay contained core zones in 2018, 2019 and 2020. A single core zone was identified further into Boka Kotorska Bay in 2021 ( Figure 10). In 2016 and 2017, survey efforts were skewed to the southern section of Montenegro (43 of the 51 surveys in 2016 and 123 of the 192 surveys in 2017), due to DMAD being based in Ulcinj and in Bar in 2016 and 2017 respectively. ...
Context 5
... presence of a single core zone in Boka Kotorska Bay in 2021 is directly related to the highly skewed survey effort to the northern section of Montenegro due to the travel restrictions during the COVID19 period (52 of the 53 surveys). When the general core zones of bottlenose dolphins were mapped with the entire dataset between 2016 and 2021, the entrance of Boka Kotorska Bay and later the coastal waters of Bar, Utjeha and Ulcinj stood out in the entire country ( Figure 11). To visualize the impact of marine traffic on bottlenose dolphin distribution, maps were created showing the general dolphin core zones and the density of the different types of marine traffic ( Figure 12). ...
Context 6
... the general core zones of bottlenose dolphins were mapped with the entire dataset between 2016 and 2021, the entrance of Boka Kotorska Bay and later the coastal waters of Bar, Utjeha and Ulcinj stood out in the entire country ( Figure 11). To visualize the impact of marine traffic on bottlenose dolphin distribution, maps were created showing the general dolphin core zones and the density of the different types of marine traffic ( Figure 12). The total marine traffic showed the strongest overlap with the dolphin core zones in the coastal waters of Bar and in the entrance of Boka Kotorska Bay. ...
Context 7
... strongest overlap with the different types of marine traffic was then identified. Finally, a map was created to show the impact of seismic activities on bottlenose dolphin distribution ( Figure 13). An overlap was shown in the coastal waters of Utjeha and Bar. Figure 13. ...
Context 8
... overlap was shown in the coastal waters of Utjeha and Bar. Figure 13. Overlap between general dolphin core zones and seismic operation density. ...
Context 9
... has had a global reach since its establishment ( Figure 14). Our onsite interns make a huge contribution to DMAD's data collection and analysis. ...

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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.