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dc.contributor.authorSilva, Monica A.  Concept link
dc.contributor.authorPrieto, Rui  Concept link
dc.contributor.authorCascao, Irma  Concept link
dc.contributor.authorSeabra, Maria I.  Concept link
dc.contributor.authorMachete, Miguel  Concept link
dc.contributor.authorBaumgartner, Mark F.  Concept link
dc.contributor.authorSantos, Ricardo S.  Concept link
dc.date.accessioned2013-11-07T15:57:41Z
dc.date.available2013-11-07T15:57:41Z
dc.date.issued2013-02
dc.identifier.urihttps://hdl.handle.net/1912/6290
dc.descriptionAuthor Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Taylor & Francis for personal use, not for redistribution. The definitive version was published in Marine Biology Research 10 (2014): 123-137, doi:10.1080/17451000.2013.793814.en_US
dc.description.abstractCetaceans living in offshore waters are under increasing pressure from anthropogenic activities. Yet, due to the lack of survey effort, relatively little is known about the demography or ecology of these populations. Spatial and temporal distribution of cetaceans in mid-Atlantic waters were investigated using a long term dataset collected from boat surveys and land-based observations around the Azores. From 1999 to 2009, 7307 cetacean schools were sighted during 271717 km of survey effort. In 4944 h of land-based observations, 2968 cetacean groups were detected. Twenty-four species were recorded: seven baleen whales, six beaked whales, eight dolphin species, Physeter macrocephalus, Kogia breviceps and K. sima. Overall, Delphinus delphis was the most frequently sighted species but its encounter rate decreased in June- November, coinciding with presence of Stenella frontalis in the region. Tursiops truncatus, P. macrocephalus and Grampus griseus were frequently encountered yearround, whereas large baleen whales showed a distinct peak in encounter rates in March-May. Mesoplodonts were fairly common and appear to be present throughout the year. These findings fill-in a significant gap in the knowledge of cetaceans occurring in a poorly studied region of the North Atlantic, providing much needed data to inform management initiatives.en_US
dc.description.sponsorshipThis work was supported by FEDER funds, through the Competitiveness Factors Operational Programme – COMPETE, by national funds, through FCT – Foundation for Science and Technology, under projects CETAMARH (POCTI/BSE/38991/01) and TRACE (PTDC/MAR/74071/2006), and by regional funds, through DRCT/SRCTE, under project MAPCET (M2.1.2/F/012/2011). We thank the Azorean Regional Government for funding POPA, the Shipowners Proprietors and the Association of the Tuna Canning Industries for their support to the programme. MAS was supported by an FCT postdoctoral grant (SFRH/BPD/29841/2006), and IC and RP were supported by doctoral grants SFRH/BD/41192/2007 and SFRH/BD/32520/2006. IMAR-DOP/UAç is the R&D Unit #531 and part of the Associated Laboratory #9 (ISR) funded through the pluri-annual and programmatic funding schemes of FCT-MCTES and DRCTAzores.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoenen_US
dc.relation.urihttps://doi.org/10.1080/17451000.2013.793814
dc.subjectCetaceansen_US
dc.subjectSpatial and temporal distributionen_US
dc.subjectMid-Atlantic watersen_US
dc.subjectSighting surveysen_US
dc.titleSpatial and temporal distribution of cetaceans in the mid-Atlantic waters around the Azoresen_US
dc.typePreprinten_US


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