Vessel noise affects beaked whale behavior: Results of a dedicated acoustic response study

Enrico Pirotta, Rachel Milor, Nicola Jane Quick, David Moretti, Nancy Dimarzio, Peter Lloyd Tyack, Ian Boyd, Gordon Drummond Hastie

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)
3 Downloads (Pure)

Abstract

Some beaked whale species are susceptible to the detrimental effects of anthropogenic noise. Most studies have concentrated on the effects of military sonar, but other forms of acoustic disturbance (e.g. shipping noise) may disrupt
behavior. An experiment involving the exposure of target whale groups to intense vessel-generated noise tested how these exposures influenced the foraging behavior of Blainville’s beaked whales (Mesoplodon densirostris) in the Tongue of the Ocean (Bahamas). A military array of bottom-mounted hydrophones was used to measure the response based upon changes in the spatial and temporal pattern of vocalizations. The archived acoustic data were used to compute metrics the echolocation-based foraging behavior for 16 targeted groups, 10 groups further away on the range, and 26 nonexposed groups. The duration of foraging bouts was not significantly affected by the exposure. Changes in the hydrophone over which the group was most frequently detected occurred as the animals moved around within a foraging bout, and their number was significantly less the closer the whales were to the sound source. Non-exposed groups also had significantly more changes in the primary hydrophone than exposed groups irrespective of distance. Our results suggested that broadband ship noise caused a significant change in beaked whale behavior up to at least 5.2 kilometers away from the vessel. The observed change could potentially correspond to a restriction in the movement of groups, a period of more directional travel, a reduction in the number of individuals clicking within the group, or a response to changes in prey movement.
Original languageEnglish
Article numbere42535
JournalPLoS One
Volume7
Issue number8
DOIs
Publication statusPublished - 3 Aug 2012

Fingerprint

Dive into the research topics of 'Vessel noise affects beaked whale behavior: Results of a dedicated acoustic response study'. Together they form a unique fingerprint.

Cite this