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dc.contributor.authorArranz, Patricia
dc.contributor.authorBenoit-Bird, Kelly
dc.contributor.authorFriedlaender, Ari S.
dc.contributor.authorHazen, Elliot L.
dc.contributor.authorGoldbogen, Jeremy A.
dc.contributor.authorStimpert, Alison K.
dc.contributor.authorDe Ruiter, Stacy Lynn
dc.contributor.authorCalambokidis, John
dc.contributor.authorSouthall, Brandon
dc.contributor.authorFahlman, Andreas
dc.contributor.authorTyack, Peter Lloyd
dc.identifier.citationArranz , P , Benoit-Bird , K , Friedlaender , A S , Hazen , E L , Goldbogen , J A , Stimpert , A K , De Ruiter , S L , Calambokidis , J , Southall , B , Fahlman , A & Tyack , P L 2019 , ' Diving behavior and fine-scale kinematics of free-ranging Risso’s dolphins foraging in shallow and deep-water habitats ' , Frontiers in Ecology and Evolution , vol. 7 , 53 .
dc.identifier.otherPURE: 257775767
dc.identifier.otherPURE UUID: c52443df-0e6d-43f0-8a16-aaa03b13d6fd
dc.identifier.otherScopus: 85065444925
dc.identifier.otherWOS: 000467400300001
dc.identifier.otherORCID: /0000-0002-8409-4790/work/60887827
dc.descriptionFunding: SOCAL-BRS project, Chief of Naval Operations Environmental Readiness Division, the US Navy's Living Marine Resources Program, and the Office of Naval Research Marine Mammal Program; ONR grant N00014-15-1-255 and the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland supported by the Scottish Funding Council, grant reference HR09011, and contributing institutions) (PLT).en
dc.description.abstractAir-breathing marine predators must balance the conflicting demands of oxygen conservation during breath-hold and the cost of diving and locomotion to capture prey. However, it remains poorly understood how predators modulate foraging performance when feeding at different depths and in response to changes in prey distribution and type. Here, we used high-resolution multi-sensor tags attached to Risso’s dolphins (Grampus griseus) and concurrent prey surveys to quantify their foraging performance over a range of depths and prey types. Dolphins (N=33) foraged in shallow and deep habitats [seabed depths less or more than 560m, respectively] and within the deep habitat, in vertically stratified prey features occurring at several aggregation levels. Generalized linear mixed-effects models indicated that dive kinematics were driven by foraging depth rather than habitat. Bottom-phase duration and number of buzzes (attempts to capture prey) per dive increased with depth. In deep dives, dolphins were gliding for >50% of descent and adopted higher pitch angles both during descent and ascents, which was likely to reduce energetic cost of longer transits. This lower cost of transit was counteracted by the record of highest vertical swim speeds, rolling maneuvers and stroke rates at depth, together with a 4-fold increase in the inter-buzz interval, suggesting higher costs of pursuing and handling prey compared to shallow-water feeding. In spite of the increased capture effort at depth, dolphins managed to keep their estimated overall metabolic rate comparable across dive types. This indicates that adjustments in swimming modes may enable energy balance in deeper dives. If we think of the surface as a central place where divers return to breathe, our data match predictions that central place foragers should increase the number and likely quality of prey items at greater distances. These dolphins forage efficiently from near-shore benthic communities to depth-stratified scattering layers, enabling them to maximize their fitness.
dc.relation.ispartofFrontiers in Ecology and Evolutionen
dc.rightsCopyright © 2019 Arranz, Benoit-Bird, Friedlaender, Hazen, Goldbogen, Stimpert, DeRuiter, Calambokidis, Southall, Fahlman and Tyack. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.subjectDeep diving odontoceteen
dc.subjectForaging energeticsen
dc.subjectMarine mammalen
dc.subjectGrampus griseusen
dc.subjectActivity levelen
dc.subjectPrey valueen
dc.subjectCentral place foraging theoryen
dc.subjectGC Oceanographyen
dc.subjectQH301 Biologyen
dc.titleDiving behavior and fine-scale kinematics of free-ranging Risso’s dolphins foraging in shallow and deep-water habitatsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Centre for Social Learning & Cognitive Evolutionen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.Bioacoustics groupen
dc.contributor.institutionUniversity of St Andrews.Sound Tags Groupen
dc.contributor.institutionUniversity of St Andrews.Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews.School of Biologyen
dc.description.statusPeer revieweden

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