Modeling the acoustic repertoire of Cuvier's beaked whale clicks

Guilment, Thomas; Sidorovskaia, Natalia A.; Li, Kun

doi:10.1121/10.0001266

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Also, there was uncertainty of the beam pattern effect for off-axis clicks. The question as to whether the beaked whale maintains the upsweep spectral structures for off-axis clicks is still open and was only investigated by a single peerreviewed article by Guilment et al, 2020. All these factors could explain significant differences in regional densities estimates across different research groups.…”

Section: Discussionmentioning

confidence: 99%

“…To estimate R sn , the whale location and orientation with respect to a receiver is also simulated following Küsel et al, 2011. The source levels, L S , of 225 dB re 1 mPa 2 m 2 and 220 dB re 1 mPa 2 m 2 for Cuvier's and Gervais' beaked whales (Hildebrand et al, 2015), respectively, were used. The off-axis attenuation of source level/click directionality (source level direction dependence) was taken into account by using the flat circular piston model (Au, 1993;Zimmer et al, 2005;Au and Hastings, 2008;Guilment et al, 2020):…”

Section: Probability Of Detectionmentioning

confidence: 99%

“…Starting in 2010, acoustic monitoring projects were conducted in the region and across the GoM. to understand the long-term impact of the spill on regional populations of marine mammals (Ackleh et al, 2012;Hildebrand et al, 2015;Dyer et al, 2015;Hildebrand et al, 2019;Sidorovskaia, 2019;Guilment et al, 2020;Li et al, 2021). Unlike other datasets providing coarse spatial resolution observations across large regions of the GoM, the LADC-GEMM data collection methodology focused on habitat use on the regional scale (Mississippi Canyon (MC) area).…”

Section: Introductionmentioning

confidence: 99%

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Investigating beaked whale’s regional habitat division and local density trends near the Deepwater Horizon oil spill site through acoustics

Sidorovskaia²,

Guilment³

et al. 2023

Front. Mar. Sci.

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Pre-spill and post-spill passive acoustic data collected by multiple fixed acoustic sensors monitoring about 2400 km2 area to the west of the Deepwater Horizon oil spill in the northern Gulf of Mexico (GoM) were analyzed to understand long term local density trends and habitat use by different species of beaked whales. The data were collected in the Mississippi Valley/Canyon area between 2007 and 2017. A multistage algorithm based on unsupervised machine learning was developed to detect and classify different species of beaked whales and to derive species- and site-specific densities in different years before and after the oil spill. The results suggest that beaked whales continued to occupy and feed in these areas following the Deepwater Horizon oil spill thus raising concerns about (1) potential long-term effects of the spill on these species and (2) the habitat conditions after the spill. The average estimated local density of Cuvier’s beaked whales at the closest site, about 16 km away from the spill location showed statistically significant increase from July 2007 to September 2010, and then from September 2010 to 2015. This is the first acoustic study showing that Gervais’ beaked whales are predominantly present at the shallow site and that Cuvier’s species dominate at two deeper sites, supporting the habitat division (ecological niche) hypothesis. The findings call for continuing high-spatial-resolution long-term observations to fully characterize baseline beaked whale population and habitat use, to understand the causes of regional migrations, and to monitor the long-term impact of the spill.

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Section: Discussionmentioning

confidence: 99%

Section: Probability Of Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigating beaked whale’s regional habitat division and local density trends near the Deepwater Horizon oil spill site through acoustics

Sidorovskaia²,

Guilment³

et al. 2023

Front. Mar. Sci.

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Introduction to the special issue on the effects of sound on aquatic life

Thomsen

Erbe

Hawkins

et al. 2020

The Journal of the Acoustical Society of America

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The effects of anthropogenic (man-made) underwater sound on aquatic life have become an important environmental issue. One of the focal ways to present and to share knowledge on the topic has been the international conference on The Effects of Noise on Aquatic Life (“Aquatic Noise”). The conferences have brought together people from diverse interests and backgrounds to share information and ideas directed at understanding and solving the challenges of the potential effects of sound on aquatic life. The papers published here and in a related special issue of Proceedings of Meetings on Acoustics present a good overview of the many topics and ideas covered at the meeting. Indeed, the growth in studies on anthropogenic sound since the first meeting in 2007 reflects the increasing use of oceans, lakes, rivers, and other waterways by humans. However, there are still very substantial knowledge gaps about the effects of sound on all aquatic animals, and these gaps lead to there being a substantial need for a better understanding of the sounds produced by various sources and how these sounds may affect animals.

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Recognition method for the bionic camouflage click communication trains modulated by time delay difference

Jiajia

Qiao

et al. 2022

The Journal of the Acoustical Society of America

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Bionic camouflage covert underwater acoustic communication has recently attracted great attention. However, we have not found relevant methods or literature to recognize these bionic camouflage communication signals (BCCSs) in the area of anti-reconnaissance. Focused on recognizing the BCCSs, this article proposes a recognition method based on the statistics of inter-click intervals to recognize the camouflaged click communication train (CCCT), which is modulated by time delay difference (TDD). We first analyze the characteristics of TDD distributions of CCCT and real click train (RCT). According to the coding principle, the TDDs of CCCTs present a ladder-like distribution with a fixed time step, and the TDDs are equal to the integral multiple of the fixed time step. On the contrary, the TDDs of RCTs are approximately random distribution within a certain time range. Therefore, based on the different TDD distributions, this article classifies CCCTs and RCTs by utilizing the statistical property of TDD distributions. To measure the TDDs of diverse cetacean clicks accurately, a new click location scheme based on the dynamic window energy ratio is proposed. Next, based on the statistics of TDD distribution, the influences of the TDDs that are caused by multipath interferences are eliminated by iteration. Simulations demonstrate the accuracy of the recognition method under different conditions.

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Modeling the acoustic repertoire of Cuvier's beaked whale clicks

Cited by 4 publications

References 13 publications

Investigating beaked whale’s regional habitat division and local density trends near the Deepwater Horizon oil spill site through acoustics

Investigating beaked whale’s regional habitat division and local density trends near the Deepwater Horizon oil spill site through acoustics

Introduction to the special issue on the effects of sound on aquatic life

Recognition method for the bionic camouflage click communication trains modulated by time delay difference

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