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dc.contributor.authorRomagosa, Miriam
dc.contributor.authorCascão, Irma
dc.contributor.authorMerchant, Nathan D.
dc.contributor.authorLammers, Marc O.
dc.contributor.authorGiacomello, Eva
dc.contributor.authorMarques, Tiago A.
dc.contributor.authorSilva, Mónica A.
dc.identifier.citationRomagosa , M , Cascão , I , Merchant , N D , Lammers , M O , Giacomello , E , Marques , T A & Silva , M A 2017 , ' Underwater ambient noise in a baleen whale migratory habitat off the Azores ' , Frontiers in Marine Science , vol. 4 , 109 .
dc.identifier.otherPURE: 250935965
dc.identifier.otherPURE UUID: 7cd38117-56fe-4f41-a1cb-9d391d0081e7
dc.identifier.otherRIS: urn:AF7C67D4A342075E5302952D1E73C349
dc.identifier.otherScopus: 85020093790
dc.identifier.otherORCID: /0000-0002-2581-1972/work/56861299
dc.identifier.otherWOS: 000457690600109
dc.descriptionTM is a member of CEA/UL (Funded by FCT- Fundação para a Ciência e a Tecnologia, Portugal, through the project UID/MAT/00006/2013).en
dc.description.abstractAssessment of underwater noise is of particular interest given the increase in noise-generating human activities and the potential negative effects on marine mammals which depend on sound for many vital processes. The Azores archipelago is an important migratory and feeding habitat for blue (Balaenoptera musculus), fin (Balaenoptera physalus) and sei whales (Balaenoptera borealis) en route to summering grounds in northern Atlantic waters. High levels of low frequency noise in this area could displace whales or interfere with foraging behavior, impacting energy intake during a critical stage of their annual cycle. In this study, bottom-mounted Ecological Acoustic Recorders were deployed at three Azorean seamounts (Condor, Açores and Gigante) to measure temporal variations in background noise levels and ship noise in the 18-1,000 Hz frequency band, used by baleen whales to emit and receive sounds. Monthly average noise levels ranged from 90.3 dB re 1 μPa (Açores seamount) to 103.1 dB re 1 μPa (Condor seamount) and local ship noise was present up to 13% of the recording time in Condor. At this location, average contribution of local boat noise to background noise levels is almost 10 dB higher than wind contribution, which might temporally affect detection ranges for baleen whale calls and difficult communication at long ranges. Given the low time percentatge with noise levels above 120 dB re 1μPa found here (3.3 % at Condor), we woud expect limited behavioural responses to ships from baleen whales. Sound pressure levels measured in the Azores are lower than those reported for the Mediterranean basin and the Strait of Gibraltar. However, the currently unknown effects of baleen whale vocalization masking and the increasing presence of boats at the monitored sites underline the need for continuous monitoring to understand any long-term impacts on whales.
dc.relation.ispartofFrontiers in Marine Scienceen
dc.rightsCopyright © 2017 Romagosa, Cascão, Merchant, Lammers, Giacomello, Marques and Silva. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.subjectUnderwater noiseen
dc.subjectShip noiseen
dc.subjectBaleen whaleen
dc.subjectOpen ocean environmenten
dc.subjectQH301 Biologyen
dc.subjectGC Oceanographyen
dc.subjectSDG 14 - Life Below Wateren
dc.titleUnderwater ambient noise in a baleen whale migratory habitat off the Azoresen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. Centre for Research into Ecological & Environmental Modellingen
dc.description.statusPeer revieweden

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