Fisheries and Oceans Canada, Bedford Institute of Oceanography, 1 Challenger Drive, Dartmouth, Nova Scotia, B2Y 4A2, Canada.
Department of Biology, Dalhousie University, 1355 Oxford Street, P.O. Box 15000, Halifax, Nova Scotia, B3H 4R2, Canada.
J Acoust Soc Am. 2019 Jul;146(1):307. doi: 10.1121/1.5111336.
Passive acoustic monitoring (PAM) is crucial to expanding the knowledge of beaked whales, including the northern bottlenose whale (Hyperoodon ampullatus) and Sowerby's beaked whale (Mesoplodon bidens). Existing descriptions of clicks produced by these species are limited by sample size, number of individuals recorded, and geographic scope. Data from multiple encounters in the western North Atlantic are used to provide a quantitative description of clicks produced by these species. Recordings from nine encounters with northern bottlenose whales in Nova Scotia and Newfoundland were analyzed (N = 2239 clicks). The click type described had a median peak frequency of 25.9 kHz (10th-90th percentile range: 22.9-29.3 kHz), and a median inter-click interval (ICI) of 402 ms (N = 1917, 10th-90th percentile range: 290-524 ms). Recordings from 18 Sowerby's beaked whale encounters from Nova Scotia were analyzed (N = 762 clicks). The click type described had a median peak frequency of 65.8 kHz (10th-90th percentile range: 61.5-76.5 kHz), and a median ICI of 237 ms (N = 677, 10th-90th percentile range: 130-315 ms). These results will contribute to the development of methods to detect and classify beaked whale clicks to the species level, improving the effectiveness of PAM and enhancing scientific understanding and conservation efforts for cryptic and at-risk cetaceans.
被动声学监测（PAM）对于扩展喙鲸的知识至关重要，包括北方瓶鼻鲸（Hyperoodon ampullatus）和索氏中喙鲸（Mesoplodon bidens）。这些物种产生的咔哒声的现有描述受到样本量、记录个体数量和地理范围的限制。来自北大西洋西部的多次遭遇的数据用于提供这些物种产生的咔哒声的定量描述。对在新斯科舍省和纽芬兰省与北方瓶鼻鲸的九次遭遇的记录进行了分析（N=2239 次咔哒声）。所描述的咔哒声类型的峰值频率中位数为 25.9 kHz（第 10 至 90 个百分位范围：22.9-29.3 kHz），而中值的两次咔哒声之间的间隔（ICI）为 402 ms（N=1917，第 10 至 90 个百分位范围：290-524 ms）。对来自新斯科舍省的 18 次索氏中喙鲸遭遇的记录进行了分析（N=762 次咔哒声）。所描述的咔哒声类型的峰值频率中位数为 65.8 kHz（第 10 至 90 个百分位范围：61.5-76.5 kHz），而中值的两次咔哒声之间的间隔（ICI）为 237 ms（N=677，第 10 至 90 个百分位范围：130-315 ms）。这些结果将有助于开发用于检测和分类喙鲸咔哒声到物种水平的方法，提高 PAM 的有效性，并增强对隐匿和濒危鲸目动物的科学理解和保护工作。
