当前位置: X-MOL 学术Mar. Mamm. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Occurrence of Indo‐Pacific bottlenose dolphins (Tursiops aduncus) off the Wild Coast of South Africa using photographic identification
Marine Mammal Science ( IF 2.3 ) Pub Date : 2020-09-13 , DOI: 10.1111/mms.12740
Michelle Caputo 1, 2 , Thibaut Bouveroux 3, 4, 5 , Pierre William Froneman 1 , Titus Shaanika 6 , Stephanie Plön 7
Affiliation  

The present study represents the first reported boat‐based photographic identification study of Indo‐Pacific bottlenose dolphins (Tursiops aduncus) off the Wild Coast of southeast South Africa. This area is known for the annual sardine run, which attracts apex predators to the region during the austral winter. Dedicated photo‐identification surveys were conducted along this coast at three different study sites in February, June, and November of each year from 2014 to 2016. During 47 surveys, 136 bottlenose dolphin groups were encountered, an estimated 4,474 dolphins observed, and 2,149 individuals were identified. Although most individuals (N = 1,770, 82.4%) were only observed once, some were resighted 2–7 times (N = 379, 17.6%), with an average of 305 days (range: 88–705 days) between resightings. The majority of bottlenose dolphins were resighted within the same study site (N = 192), indicating some degree of residency. However, 65 individuals were observed at two different study sites, indicating individual movements along the coast. Our findings contrast earlier suggestions that bottlenose dolphins only use the Wild Coast during the sardine run, as we found large number of animals year‐round with some level of site fidelity. This highlights the importance of the Wild Coast to bottlenose dolphins and provides further information on their status off southeastern South Africa.

中文翻译:

使用照相识别在南非野生海岸外发生印度太平洋宽吻海豚(Tursiops aduncus)

本研究代表了首次报道的基于船拍的南非东南沿海外海的印度太平洋宽吻海豚(Tursiops aduncus)摄影识别研究。该地区以每年的沙丁鱼奔跑而闻名,在南方冬季期间,该地区吸引了先天的掠食者到该地区。从2014年到2016年,分别在每年的2月,6月和11月在此海岸的三个不同的研究地点进行了专门的照片识别调查。在47次调查中,遇到了136只宽吻海豚群,估计观察到4,474只海豚,以及2,149只个体被确定。尽管大多数人(N = 1,770,82.4%)仅被观察到一次,但有些人被改正了2–7次(N= 379,占17.6%),平均两次修订之间平均间隔305天(范围:88-705天)。大部分宽吻海豚都在同一研究地点进行了观察(N = 192),表明有一定程度的居住权。但是,在两个不同的研究地点观察到65个人,表明沿海岸有个人运动。我们的发现与先前的建议相反,即宽吻海豚仅在沙丁鱼运行期间使用狂野海岸,因为我们发现全年都有大量动物,并且具有一定程度的位置保真度。这凸显了野生海岸对宽吻海豚的重要性,并提供了有关它们在南非东南部以外的地位的进一步信息。
更新日期:2020-09-13
down
wechat
bug