Journal ArticleDOI
Responses of cetaceans to anthropogenic noise
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TLDR
In this paper, a review of the effects of anthropogenic noise on cetaceans has been published and their ability to document response(s), or the lack thereof, has improved.Abstract:
1
Since the last thorough review of the effects of anthropogenic noise on cetaceans in 1995, a substantial number of research reports has been published and our ability to document response(s), or the lack thereof, has improved. While rigorous measurement of responses remains important, there is an increased need to interpret observed actions in the context of population-level consequences and acceptable exposure levels. There has been little change in the sources of noise, with the notable addition of noise from wind farms and novel acoustic deterrent and harassment devices (ADDs/AHDs). Overall, the noise sources of primary concern are ships, seismic exploration, sonars of all types and some AHDs.
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Responses to noise fall into three main categories: behavioural, acoustic and physiological. We reviewed reports of the first two exhaustively, reviewing all peer-reviewed literature since 1995 with exceptions only for emerging subjects. Furthermore, we fully review only those studies for which received sound characteristics (amplitude and frequency) are reported, because interpreting what elicits responses or lack of responses is impossible without this exposure information. Behavioural responses include changes in surfacing, diving and heading patterns. Acoustic responses include changes in type or timing of vocalizations relative to the noise source. For physiological responses we address the issues of auditory threshold shifts and ‘stress’, albeit in a more limited capacity; a thorough review of physiological consequences is beyond the scope of this paper.
3
Overall, we found significant progress in the documentation of responses of cetaceans to various noise sources. However, we are concerned about the lack of investigation into the potential effects of prevalent noise sources such as commercial sonars, depth finders and fisheries acoustics gear. Furthermore, we were surprised at the number of experiments that failed to report any information about the sound exposure experienced by their experimental subjects. Conducting experiments with cetaceans is challenging and opportunities are limited, so use of the latter should be maximized and include rigorous measurements and or modelling of exposure.read more
Citations
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Book ChapterDOI
Hearing in Whales and Dolphins: Relevance and Limitations.
TL;DR: The methods used during a stranding event are presented along with the major difficulties that have slowed down the scientific community in measuring the audition of large whales and the potential value in obtaining such results when successful.
Book ChapterDOI
Identifying Variations in Baseline Behavior of Killer Whales (Orcinus orca) to Contextualize Their Responses to Anthropogenic Noise.
TL;DR: Variations in feeding behavior in the context of exposure to noise are discussed and observed responses to simulated navy sonar signals are interpreted.
Dissertation
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Journal ArticleDOI
Distribution, and Socioeconomic Analysis of Delphinus delphis and Tursiops truncatus in Relation to Vessel Presence in the Eastern Aegean Sea
TL;DR: In this paper, the authors investigated population abundance and distribution of common (Delphinus delphis) and bottlenose dolphins (Tursiops truncatus) in the Eastern Aegean Sea, where there is limited knowledge of these species.
References
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Book
Marine mammals and noise
TL;DR: This paper presents a meta-anatomy of Marine Mammal Hearing, a probabilistic assessment of the response of marine mammals to man-made noise, and its consequences.
Journal ArticleDOI
A digital acoustic recording tag for measuring the response of wild marine mammals to sound
Mark Johnson,Peter L. Tyack +1 more
TL;DR: In this paper, a novel archival tag, called the DTAG, has been developed to monitor the behavior of marine mammals, and their response to sound, continuously throughout the dive cycle.
Journal ArticleDOI
Decline in Relative Abundance of Bottlenose Dolphins Exposed to Long-Term Disturbance
Lars Bejder,Amy Samuels,Hal Whitehead,Nick Gales,Janet Mann,Richard C. Connor,Michael R. Heithaus,Jana J. Watson-Capps,Cindy Flaherty,Michael Krützen +9 more
TL;DR: The substantial effect of tour vessels on dolphin abundance in a region of low-level tourism calls into question the presumption that dolphin-watching tourism is benign.
Journal ArticleDOI
Gas-bubble lesions in stranded cetaceans
Paul Jepson,Manuel Arbelo,Rob Deaville,I. A. P. Patterson,Pedro Castro,J.R. Baker,E. Degollada,H. M. Ross,Pedro Herráez,A. M. Pocknell,Francisco Rodríguez,F. E. Howie,A. Espinosa,R. J. Reid,José Raduan Jaber,Vidal Martín,Andrew A. Cunningham,Antonio Fernández +17 more
TL;DR: Evidence of acute and chronic tissue damage in stranded cetaceans that results from the formation in vivo of gas bubbles is presented, challenging the view that these mammals do not suffer decompression sickness.