Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe, Hyogo, 658-0022, Japan; Ocean Policy Research Institute, Sasakawa Peace Foundation, 1-15-16 Toranomon, Minato, Tokyo, 105-8524, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan; Sea Mammal Research Unit, School of Biology, University of St Andrews, St Andrews, Fife, KY16 9TS, UK.
Institute of Marine Research, P.O box, 6404, 9294, Tromsø, Norway.
Behav Processes. 2021 May;186:104369. doi: 10.1016/j.beproc.2021.104369. Epub 2021 Feb 25.
Animal-borne video loggers are powerful tools for investigating animal behaviour because they directly record immediate and extended peripheral animal activities; however, typical video loggers capture only a limited area on one side of an animal being monitored owing to their narrow field of view. Here, we investigated the resting behaviour of humpback whales using an animal-borne omnidirectional video camera combined with a behavioural data logger. In the video logger footage, two non-tagged resting individuals, which did not spread their flippers or move their flukes, were observed above a tagged animal, representing an apparent bout of group resting. During the video logger recording, the swim speed was relatively slow (0.75 m s), and the tagged animal made only a few strokes of very low amplitude during drift diving. We report the drift dives as resting behaviour specific to baleen whales as same as seals, sperm whales and loggerhead turtles. Overall, our study shows that an omnidirectional video logger is a valuable tool for interpreting animal ecology with improved accuracy owing to its ability to record a wide field of view.
动物携带式视频记录器是研究动物行为的有力工具，因为它们可以直接记录动物即时和延伸的周边活动；然而，由于其视场狭窄，典型的视频记录器只能在监测动物的一侧捕捉到有限的区域。在这里，我们使用动物携带式全向视频摄像机和行为数据记录器研究了座头鲸的休息行为。在视频记录器的画面中，两个未标记的休息个体没有张开鳍肢或摆动尾鳍，在一个标记的个体上方被观察到，这代表了一次明显的群体休息。在视频记录器记录期间，游泳速度相对较慢（0.75 米/秒），标记的个体在漂移潜水时只做了几次幅度非常低的划水动作。我们将这些漂移潜水报告为须鲸特有的休息行为，与海豹、抹香鲸和红海龟相同。总的来说，我们的研究表明，由于全向视频记录器能够记录更广阔的视野，因此它是一种有价值的工具，可以提高动物生态学解释的准确性。
