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dc.contributor.authorGannier, Alexandre
dc.contributor.authorPetiau, Estelle
dc.contributor.authorDulau, Violaine
dc.contributor.authorRendell, Luke
dc.identifier.citationGannier , A , Petiau , E , Dulau , V & Rendell , L 2012 , ' Foraging dives of sperm whales in the north-western Mediterranean Sea ' , Journal of the Marine Biological Association of the United Kingdom , vol. 92 , no. Special Issue 08 , pp. 1799-1808 .
dc.identifier.otherPURE: 36522967
dc.identifier.otherPURE UUID: ed18a2c3-1ef1-4a7c-b1b6-a8acf5661081
dc.identifier.otherRIS: urn:79F20B0FBFB72F00FE40A0B23684B8E3
dc.identifier.otherScopus: 84868517553
dc.identifier.otherORCID: /0000-0002-1121-9142/work/27612552
dc.description.abstractOceanic odontocetes rely on echolocation to forage on pelagic or benthic prey, but their feeding ecology is difficult to study. We studied sperm whale foraging dives during summer in the north-western Mediterranean, using visual and passive acoustic observations. Clicking and creaking activities were recorded during dives of focal whales, at distances <3000 m using a towed hydrophone and DAT recorder. A total of 52 sperm whales were recorded over at least one full dive cycle. Data were obtained for 156 complete dives in total, including sequences of up to nine consecutive dives. Various dive and environmental variables were entered in multiple linear regression and principal components analysis, as well as estimated mass of whales. Creak rate was 0.80 creak/minute on average, with moderate variance. Bigger whales tended to dive longer at greater depths (as suggested by ascent durations), and emitted more creaks during a dive: 20.2 creaks/dive on average for individuals <24 tons, compared to 25.6 creaks/dive for animals >24 tons of estimated mass. For individual whales, creak rates did not vary significantly with size (range 0.78–0.80 creak/minute), but decreased with time of the day, and increased for shorter foraging phases. For different dives, higher creak rates were also observed earlier in the day, and linked to shorter foraging phases and surface durations. Although the exact significance of creak emissions (i.e. foraging attempt or prey capture) is not precisely determined, creak rates may be reliably used to quantify sperm whale foraging when single animal dives can be followed acoustically.
dc.relation.ispartofJournal of the Marine Biological Association of the United Kingdomen
dc.rights(c) Marine Biological Association of the United Kingdom, 2012en
dc.subjectSperm whaleen
dc.subjectQH301 Biologyen
dc.titleForaging dives of sperm whales in the north-western Mediterranean Seaen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews. Bioacoustics groupen
dc.contributor.institutionUniversity of St Andrews. Centre for Social Learning & Cognitive Evolutionen
dc.contributor.institutionUniversity of St Andrews. Centre for Biological Diversityen
dc.description.statusPeer revieweden

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