Group definition for underwater observation of wild Indo-Pacific bottlenose dolphins

Group definition for underwater observation of wild Indo-Pacific bottlenose dolphins
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野生印度太平洋宽吻海豚水下观察的群体定义

DOI:
10.1007/s10164-023-00780-7
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发表时间:
2023
影响因子:
0.9
通讯作者:
Yoshioka Motoi
Yoshioka Motoi
中科院分区:
生物学4区
文献类型:
--
作者:
Morisaka Tadamichi;Furuichi Tomo;Kogi Kazunobu;Yoshioka Motoi

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动物种群的组定义对于在个体之间建立关联是重要的(即,社交网络)。印度太平洋海豚(Tursiops aduncus)有一个高度裂变融合的社会,随着时间的推移,它们的群体成员会发生变化,因此很难明确定义群体。此外,目前对小型飞燕科物种的群体定义主要与基于船只或陆地的调查有关,很少有水下调查的定义。我们提出了一个组的定义,水下观测比较234组转换44个调查的同时船为基础的和水下观测目标的居民印度-太平洋短吻海豚周围的三仓岛,日本。我们的研究结果高度匹配的船为基础的和水下观测之间的组转换时,所有的视频记录的海豚在一次遭遇(从进入到退出水)被定义为一个组,和组至少有一个共享的个人在一次调查被视为同一组。该定义成功地产生了与船观测高度相似的关联指数。这对于水下调查高度可观测的海豚科非常有用,特别是对于基于商业旅游的研究,其中研究人员没有完全的决策权。
The group definition for an animal population is important for building associations among individuals (i.e., social network). Indo-Pacific bottlenose dolphins (Tursiops aduncus) have a society with high fission–fusion dynamics that changes their group memberships over time, making it difficult to define groups clearly. In addition, current group definitions of small delphinid species are mainly related to boat-based or land-based surveys, and few definitions exist for underwater surveys. We propose a group definition for underwater observations after comparing 234 group transitions from 44 surveys of simultaneous boat-based and underwater observations targeting the resident Indo-Pacific bottlenose dolphins around Mikura Island, Japan. Our results highly matched group transitions between boat-based and underwater observations when all video-recorded dolphins during one encounter (from entering to exiting the water) were defined as a group, and groups with at least one shared individual during one survey were treated as the same group. This definition successfully produced highly similar association indices to boat observation. This is useful for underwater surveys of highly maneuverable delphinids, especially for commercial-tour-based studies in which researchers do not have the full decision-making authority for the observations.
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