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Spatial segregation of calving and nursing Risso’s dolphins (Grampus griseus) in the Azores, and its conservation implications

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dc.contributor.authorHartman, Karin L.
dc.contributor.authorFernandez, Marc
dc.contributor.authorAzevedo, José M. N.
dc.date.accessioned2017-05-25T14:47:12Z
dc.date.available2017-05-25T14:47:12Z
dc.date.issued2014
dc.description.abstractCalving can be a critical period for cetaceans. Areas providing security for vulnerable calves, and high food availability for lactating females can be critical habitats requiring specific conservation measures. Here, we test the hypothesis that calving and nursing habitat could be defined for Risso’s dolphins (Grampus griseus). We investigated the spatial and temporal preferences of this species around Pico Island, Azores, using data gathered from land-based surveys and dedicated at-sea observations between 2004 and 2007. We divided observed pods into three groups: (1) those with newborn and young calves, (2) those with older calves or juveniles and (3) those consisting only of adults or sub-adults. We analysed eco-geographical variables and incorporated them into a presence-only spatial distribution model to evaluate differences in habitat suitability among the groups. We identified 694 pods of Risso’s dolphins overall. On the 267 pods observed in the first and second groups, 136 calves or juveniles were identified, of which 22 were newborns. The peak of the calving season was between June and August. The pods with newborn calves were larger and closer to shore, whereas the other groups were more widely dispersed offshore. Our results support the definition of critical habitat areas for this species, but we suggest widening the geographical coverage for better mapping around the island and throughout the archipelago generally. Conservation measures can, nevertheless, be implemented immediately, in order to reduce human impacts on a vulnerable component of the Risso’s dolphin population.en
dc.description.sponsorshipEuropean Regional Development Fund (ERDF) COMPETE - Operational Competitiveness Programme.FCT - Foundation for Science and Technology, project "PEst-C/MAR/LA0015/2011".pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationHartman, K. L., Fernandez, M., & Azevedo, J.M.N. (2014). Spatial segregation of calving and nursing Risso’s dolphins (Grampus griseus) in the Azores, and its conservation implications. "Marine Biology", 161(6), 1419-1428. DOI: 10.1007/s00227-014-2430-xpt_PT
dc.identifier.doi10.1007/s00227-014-2430-xpt_PT
dc.identifier.issn1432-1793
dc.identifier.urihttp://hdl.handle.net/10400.3/4173
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Verlagpt_PT
dc.relationStrategic Project - LA 15 - 2011-2012
dc.relation.publisherversionhttp://link.springer.com/article/10.1007/s00227-014-2430-xpt_PT
dc.subjectRisso's Dolphins (Grampus griseus)en
dc.titleSpatial segregation of calving and nursing Risso’s dolphins (Grampus griseus) in the Azores, and its conservation implicationsen
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleStrategic Project - LA 15 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6820 - DCRRNI ID/PEst-C%2FMAR%2FLA0015%2F2011/PT
oaire.citation.endPage1428pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage1419pt_PT
oaire.citation.titleMarine Biologyen
oaire.citation.volume161pt_PT
oaire.fundingStream6820 - DCRRNI ID
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isProjectOfPublication2b6cd008-5a83-4b1c-91a7-7c11fdbd1e8f
relation.isProjectOfPublication.latestForDiscovery2b6cd008-5a83-4b1c-91a7-7c11fdbd1e8f

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