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    Spatial and temporal distribution of cetaceans in the mid-Atlantic waters around the Azores

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    Silva etal_2014_paper for WHOAS.pdf (1.703Mb)
    Date
    2013-02
    Author
    Silva, Monica A.  Concept link
    Prieto, Rui  Concept link
    Cascao, Irma  Concept link
    Seabra, Maria I.  Concept link
    Machete, Miguel  Concept link
    Baumgartner, Mark F.  Concept link
    Santos, Ricardo S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6290
    As published
    https://doi.org/10.1080/17451000.2013.793814
    Keyword
     Cetaceans; Spatial and temporal distribution; Mid-Atlantic waters; Sighting surveys 
    Abstract
    Cetaceans 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.
    Description
    Author 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.
    Collections
    • Biology
    Suggested Citation
    Preprint: Silva, Monica A., Prieto, Rui, Cascao, Irma, Seabra, Maria I., Machete, Miguel, Baumgartner, Mark F., Santos, Ricardo S., "Spatial and temporal distribution of cetaceans in the mid-Atlantic waters around the Azores", 2013-02, https://doi.org/10.1080/17451000.2013.793814, https://hdl.handle.net/1912/6290
     

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