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Title

Distribution and habitat modelling of common dolphins (Delphinus delphis) in the eastern North Atlantic

AuthorsCorreia, Ana M.; Gil, Ágatha; Valente, Raúl; Rosso, Massimiliano; Pierce, Graham J.; Sousa-Pinto, Isabel
KeywordsCetaceans
Ecological modelling
High seas
Macaronesia
Spatial distribution
Temporal distribution
Issue Date2019
PublisherCambridge University Press
CitationJournal of the Marine Biological Association of the United Kingdom 99(6): 1443-1457 (2019)
AbstractThe eastern North Atlantic (ENA) has many highly productive areas where several species of cetaceans have been recorded, with the common dolphin (Delphinus delphis) being one of the most frequently sighted species. However, its spatial and temporal distribution in high seas is poorly known. The study presents the results from 5 years of cetacean monitoring in the ENA (2012–2016) aboard cargo ships that follow the routes from Continental Portugal to the Macaronesian archipelagos and north-west Africa. Common dolphin was the most frequently sighted cetacean with 192 occurrences registered on effort and an overall encounter rate of 0.36 sightings/100 nmi. The species was distributed in coastal and offshore waters, but absent from the Canaries and Cape Verde islands. Statistical ‘habitat’ models were developed to describe and explain the occurrence of sightings of the species: variables affecting detection of dolphins had a small impact and there were clear spatiotemporal distribution patterns, influenced to some degree by environmental variables. Predicted probability of occurrence was highest in coastal waters of continental Portugal and around the Azores. The models, combined with maps of distribution, were useful to identify important areas for the species, which could be the focus of future conservation efforts. Common dolphin presence was related to depth, distance to coast and seamounts, seabed slope, chlorophyll concentration, sea-surface temperature and sea level anomalies; the possible ecological significance of these relationships is explored
Description15 pages, 8 figures, 3 tables
Publisher version (URL)https://doi.org/10.1017/S0025315419000249
URIhttp://hdl.handle.net/10261/188474
DOI10.1017/S0025315419000249
ISSN0025-3154
E-ISSN1469-7769
Appears in Collections:(IIM) Artículos




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