The common bottlenose dolphin (Tursiops truncatus) population along the eastern Adriatic coast is believed to comprise discrete communities, yet many of them are unstudied. This study provides the first description of occurrence and demographic parameters for the community inhabiting waters of North Dalmatia. Dedicated boat‐based surveys conducted in summer months from 2013 to 2017 resulted in 13,896 km of research effort and 284 dolphin sightings from which 336 individuals were identified. Site‐fidelity analysis revealed that 52.1% of encountered marked adults occur in the area regularly or occasionally. No significant difference among years could be found for mean group sizes (5.73–7.46) and group encounter rates (1.159–1.942 groups/100 km). Pollock's Robust Design models estimated annually variable adult apparent survival (0.737–0.986) and constant temporary emigration rate of 0.172. The estimated abundance varied annually from 116 to 138 individuals and showed a negative slope, but a significant trend could not be confirmed. Age‐dependent models estimated first‐year calf survival at 0.875. These results provide a baseline for informed management of two Sites of Community Importance, and a benchmark for future monitoring in North Dalmatian waters, an area under significant anthropogenic pressure.

中文翻译：

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克罗地亚北达尔马提亚的宽吻海豚（Tursiops truncatus）：发生和人口统计参数

常见的宽吻海豚（Tursiops truncatus）据信，亚得里亚海东部沿海地区的人口包括离散的社区，但其中许多人尚未研究。这项研究首次描述了北达尔马提亚州居住水域的发生情况和人口统计学参数。在2013年至2017年夏季，进行了专门的船上调查，共进行了13896公里的研究工作，发现了284只海豚，从中识别出336个人。现场保真度分析表明，有52.1％的遇到标记的成年人定期或偶尔在该地区出现。平均组规模（5.73-7.46）和组遭遇率（1.159-1.942组/ 100 km）之间，年份之间没有显着差异。Pollock的“稳健设计”模型估计，成年人的年表观生存率（0.737–0.986）每年可变，临时移民的固定年增长率为0.172。估计的丰度每年从116到138个人不等，并且显示为负斜率，但是无法确认明显的趋势。年龄依赖性模型估计小牛的第一年存活率为0.875。这些结果为两个社区重要场所的知情管理提供了基准，也为北达尔马提亚水域（人为压力很大的地区）的未来监测提供了基准。