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Distribution, abundance and habitat use of deep diving cetaceans in the North-East Atlantic

Research output: Contribution to journalArticle

Author(s)

Emer Rogan, Ana Cañadas, Kelly Macleod, M. Begoña Santos, Bjarni Mikkelsen, Ainhize Uriarte, Olivier Van Canneyt, José Antonio Vázquez, Philip S. Hammond

School/Research organisations

Abstract

In spite of their oceanic habitat, deep diving cetacean species have been found to be affected by anthropogenic activities, with potential population impacts of high intensity sounds generated by naval research and oil prospecting receiving the most attention. Improving the knowledge of the distribution and abundance of this poorly known group is an essential prerequisite to inform mitigation strategies seeking to minimize their spatial and temporal overlap with human activities. We provide for the first time abundance estimates for five deep diving cetacean species (sperm whale, long-finned pilot whale, northern bottlenose whale, Cuvier's beaked whale and Sowerby's beaked whale) using data from three dedicated cetacean sighting surveys that covered the oceanic and shelf waters of the North-East Atlantic. Density surface modelling was used to obtain model-based estimates of abundance and to explore the physical and biological characteristics of the habitat used by these species. Distribution of all species was found to be significantly related to depth, distance from the 2000m depth contour, the contour index (a measure of variability in the seabed) and sea surface temperature. Predicted distribution maps also suggest that there is little spatial overlap between these species. Our results represent the best abundance estimates for deep-diving whales in the North-East Atlantic, predict areas of high density during summer and constitute important baseline information to guide future risk assessments of human activities on these species, evaluate potential spatial and temporal trends and inform EU Directives and future conservation efforts.
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Original languageEnglish
Pages (from-to)8-19
JournalDeep Sea Research Part II: Topical Studies in Oceanography
Volume141
Early online date7 Apr 2017
DOIs
StatePublished - Jul 2017

    Research areas

  • Design-based abundance, Model-based abundance, Beaked whales, Sperm whales, Pilot whales, Distribution, Deep divers, Habitat models

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