The Swan–Canning River System is home to an Indo-Pacific bottlenose dolphin (Tursiops aduncus) community of currently 17 adult and juvenile individuals. While a complete photo-identification catalogue exists, visual monitoring requires repeated boat-based surveys and is thus laborious and expensive. Bottlenose dolphins are known to emit individually distinctive signature whistles, and therefore, passive acoustic monitoring could be a reliable and more efficient tool. Archived acoustic and photographic data from the Fremantle Inner Harbour were reviewed for instances when dolphin whistles and individual identifying images were simultaneously available. As dolphin whistles are commonly used in social encounters, dolphins producing whistles in this study were always in groups. Consequently, to assess whether distinctive whistles could be attributed to individual dolphins, conditional probabilities for recording a specific whistle in the presence of certain individuals, as well as Bayesian posterior probabilities for encountering a specific individual at times of certain whistles were computed. While a larger sample size is needed to capture all individuals in diverse groupings, this study provides the first step in developing a passive acoustic program for monitoring this small dolphin community, in order to ultimately inform its conservation management.

中文翻译：

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将签名口哨与西澳大利亚弗里曼特尔内港的印度太平洋宽吻海豚（Tursiops aduncus）的照片识别相匹配

天鹅-康宁河系统是印度太平洋宽吻海豚（Tursiops aduncus）的所在地）的社区，目前有17位成人和青少年。尽管存在完整的照片识别目录，但视觉监视需要重复的基于船的调查，因此既费力又昂贵。众所周知，宽吻海豚会发出独特的特征性哨声，因此，无源声学监测可能是一种可靠且更有效的工具。审查了来自弗里曼特尔内港的存档声学和摄影数据，例如当海豚哨声和个人识别图像同时可用时。由于海豚哨声通常用于社交场合，因此本研究中产生海豚哨声的海豚总是成群结队。因此，为了评估是否可以将独特的口哨归因于单个海豚，计算在某些个人在场时记录特定口哨的条件概率，以及在特定口哨时遇到特定个体的贝叶斯后验概率。虽然需要更大的样本量来捕获所有不同类别的个体，但本研究为开发被动声学程序以监测这个小型海豚群落提供了第一步，以便最终为其保护管理提供信息。