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Bottlenose dolphins in the north‐western Adriatic Sea: Abundance and management implications
Aquatic Conservation: Marine and Freshwater Ecosystems ( IF 2.4 ) Pub Date : 2021-01-19 , DOI: 10.1002/aqc.3450
Giovanni Bearzi 1, 2, 3 , Silvia Bonizzoni 1, 3 , Melissa A. Riley 1 , Nina Luisa Santostasi 1, 4, 5
Affiliation  

  1. The Adriatic Sea is one of the Mediterranean areas most heavily impacted by fishing and other human stressors. The northern part of the basin has been certified as an Important Marine Mammal Area because of the regular occurrence of common bottlenose dolphins, Tursiops truncatus.
  2. Boat surveys, totalling 76 days at sea and 10,711 km of navigation, were conducted between April 2018 and October 2019 to assess cetacean abundance within a 3,000‐km2 area off Veneto, Italy. Bottlenose dolphins – the only marine mammal species observed – were encountered on 52 days and were tracked for 81 h and 26 min, resulting in 15,066 dorsal fin photographs of high quality and resolution.
  3. Various capture–recapture models were applied on individual photo‐identification datasets. Model‐based estimates indicate that approximately 600 individuals occurred within the study area during the sampling period in both years. Abundance varied monthly: minimum estimates were obtained in May 2018 (291 individuals; 95% CI 134–630) and May 2019 (121; 95% CI 20–721), whereas maximum estimates were obtained in September 2018 (385; 95% CI 310–477) and October 2019 (494; 95% CI 378–645).
  4. Evidence provided by this study can be used to complement and validate coarse ‘snapshot’ information from recent aerial surveys of the entire Adriatic Sea, and to enforce management action mandated by the European Community (EC) Habitats Directive and Marine Strategy Framework Directive, as well as guiding the EC’s Maritime Spatial Planning.


中文翻译:

亚得里亚海西北部的宽吻海豚:数量和管理意义

  1. 亚得里亚海是地中海地区受捕鱼和其他人为压力最大的地区之一。由于经常出现宽吻宽吻海豚Tursiops truncatus,该盆地北部已被确认为重要海洋哺乳动物区。
  2. 在2018年4月至2019年10月之间进行了总计76海上航行和10,711公里航行的船只调查,以评估意大利威尼托附近3,000 km 2区域内的鲸类丰富度。宽吻海豚是仅观察到的海洋哺乳动物,在52天时被发现,并被追踪了81小时26分钟,从而得到了15,066张高质量和高分辨率的背鳍照片。
  3. 各种捕获-捕获模型都应用于单个照片识别数据集。基于模型的估计表明,在两年的抽样期内,研究区域内大约有600个人。每月的丰度不同:在2018年5月获得了最小估计数(291人; 95%CI 134-630)和2019年5月获得了最小估计数(121; 95%CI 20-721),而在2018年9月获得了最大估计值(385; 95%CI 310-477)和2019年10月(494; 95%CI 378-645)。
  4. 这项研究提供的证据可用于补充和验证来自最近对整个亚得里亚海的航测的粗略“快照”信息,以及用于执行欧洲共同体(EC)人居指令和海洋战略框架指令授权的管理措施。作为指导EC的海洋空间规划的依据。
更新日期:2021-03-12
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