Finding beaked whales in the Foz do Amazonas basin: Visual and acoustic records of a deep diving cetacean.

IF 2.3 2区 物理与天体物理 Q2 ACOUSTICS
Raphael Barbosa Machado, João Pedro Mura, Giovanne Ambrosio Ferreira, Franciele Rezende de Castro, Natália Rodrigues-Soares, Larissa Kelmer de Lima Kascher, Bárbara Stefânea da Silva, Gabrieli Messias Rodrigues, Lúcia Alencar, Yasmin Viana, Daniela Ferro de Godoy, Pedro Volkmer de Castilho, Artur Andriolo
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引用次数: 0

Abstract

Beaked whales, deep-diving cetaceans from the family Ziphiidae, exhibit cryptic behaviors, and data on these species in Brazilian waters are limited to strandings and isolated sightings. This study characterizes the occurrence and acoustic behavior of beaked whales in the Foz do Amazonas Basin using combined visual and passive acoustic monitoring along the Brazilian Equatorial Margin. Audio files were analyzed to identify clicks with frequency-modulated pulses, a diagnostic characteristic of beaked whales. The PAMpal package in R was used to calculate acoustic parameters, including peak frequency, 3- and 10-dB bandwidths, and inter-pulse intervals. Three sightings, eight acoustic detections, and one combined visual-acoustic detection were recorded. Based on diagnostic features, sighting D01 likely corresponds to Mesoplodon europaeus, D05 may represent Mesoplodon, and D06 could belong to either Ziphius or Mesoplodon. Unsupervised clustering based on peak frequency and inter-pulse intervals revealed three distinct acoustic clusters, suggesting that at least three different beaked whale species were detected. Further acoustic classification studies are needed to determine the specific species associated with each cluster. These findings contribute to a broader understanding of the distribution and acoustic ecology of deep-diving beaked whales in the Foz do Amazonas Basin, a region where information on marine megafauna remains scarce.

在亚马逊河流域发现喙鲸:深潜鲸类动物的视觉和声学记录。
喙鲸是一种深潜的鲸科动物,它们表现出神秘的行为,在巴西水域关于这些物种的数据仅限于搁浅和孤立的目击。本研究利用巴西赤道边缘的视觉和被动声学监测相结合的方法,描述了亚马逊河流域喙鲸的发生和声学行为。对音频文件进行分析,以识别带有调频脉冲的咔哒声,这是喙鲸的一种诊断特征。使用R中的PAMpal包计算声学参数,包括峰值频率、3 db和10 db带宽以及脉冲间隔。记录了3次目击,8次声学探测和1次视声联合探测。从诊断特征来看,D01可能属于欧洲中plodon Mesoplodon europaeus, D05可能属于中plodon, D06可能属于Ziphius或中plodon。基于峰值频率和脉冲间隔的无监督聚类揭示了三个不同的声学簇,这表明至少检测到三种不同的喙鲸物种。需要进一步的声学分类研究来确定与每个集群相关的特定物种。这些发现有助于更广泛地了解亚马逊河流域深潜喙鲸的分布和声学生态,该地区的海洋巨型动物信息仍然很少。
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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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