Whistle structure variation between two sympatric dolphin species in the Gulf of California

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Simone Antichi, Manali Rege‑Colt, Maia Austin, Laura J. May‑Collado, Óscar Carlón-Beltrán, Jorge Urbán R., Sergio Martínez-Aguilar, Lorena Viloria-Gómora
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引用次数: 0

Abstract

Dolphins produce narrowband and frequency modulated sounds called whistles during a variety of behavioral contexts. Dolphin species vary in their whistle contour composition, frequency range, modulation, and duration, and these differences can be useful in their identification. Here, we compare the whistle contours of two sympatric dolphin species at La Paz Bay, Gulf of California, the Eastern Tropical Pacific bottlenose dolphin, and the long-beaked common dolphin. Dolphins were recorded (7 h and 1 min recording effort) from the research vessel with the engine off using an over-the-side hydrophone and a broadband recording system. A total of 666 high quality whistles (bottlenose dolphin, n = 415; long-beaked common dolphin, n = 251) were analyzed. A Random Forest Analysis identified duration, ending frequency, and maximum frequency as the most important variables that distinguish the two dolphin species. The most common whistle contour types of bottlenose dolphins were sine and convex, while the long-beaked common dolphins produced mainly upsweep and concave whistles. The results showed that bottlenose dolphins and long-beaked common dolphins differ in their whistle variables and contours facilitating their identification in future passive acoustic studies.

Abstract Image

加利福尼亚湾两种同域海豚的哨音结构变异
海豚在各种行为背景下都会发出窄带和频率调制的声音,即哨声。海豚的种类在哨声轮廓组成、频率范围、调制和持续时间上各不相同,这些差异有助于识别海豚。在此,我们比较了加利福尼亚湾拉巴斯湾的两种同域海豚--东热带太平洋瓶鼻海豚和长喙普通海豚--的哨音轮廓。在研究船上,使用侧向水听器和宽带记录系统,在关闭发动机的情况下对海豚进行了记录(7 小时 1 分钟的记录工作)。共分析了 666 次高质量的口哨声(瓶鼻海豚,n = 415;长喙普通海豚,n = 251)。随机森林分析确定了持续时间、终止频率和最高频率是区分两种海豚的最重要变量。瓶鼻海豚最常见的哨音轮廓类型是正弦和凸形,而长喙普通海豚则主要发出上扫和凹形哨音。研究结果表明,瓶鼻海豚和长喙普通海豚在哨音变量和轮廓上存在差异,这有助于在未来的被动声学研究中识别它们。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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