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dc.contributor.authorLerma, Miriam
dc.contributor.authorDehnhard, Nina
dc.contributor.authorLuna-Jorquera, Guillermo
dc.contributor.authorVoigt, Christian C.
dc.contributor.authorGarthe, Stefan
dc.identifier.citationBehavioral Ecology and Sociobiology. 2020, 74 (149), .en_US
dc.description.abstractSexual segregation in foraging occurs in some species and populations of boobies (Sulidae), but it is not a general pattern. Sexual segregation in foraging may occur to avoid competition for food, and this competition may intensify during specific stages of breeding. We examined sexual segregation in foraging in relation to breeding stage in masked boobies Sula dactylatra at Rapa Nui by tracking simultaneously incubating and chick-rearing birds using GPS recorders (n = 18) and collected a total of 11 regurgitate samples. Stable isotope analyses (δ13C and δ15N) of whole blood samples were carried out in 20 birds. There were no differences in foraging trip parameters or diet between females and males. Both sexes traveled farther and for longer while incubating than while rearing chicks. Isotopic niches (δ13C and δ15N) overlapped to some degree among all groups at all times, but the lowest overlap between sexes occurred during incubation. While preying on ephemerally distributed flying fish, vertical or horizontal competition avoidance may be almost impossible, and thus females and males share their foraging grounds. Since birds were tracked simultaneously, shorter foraging trips of chick-rearing birds must be an effect of the constraints of provisioning the chick. Differences observed in δ15N and δ13C values between sexes may be caused by subtle differences in their foraging behaviors, or by differences in physiology linked to breeding. Our findings suggest that local oceanography and its inherent food distribution are determinants for sexual segregation in foraging patterns in masked boobies and possibly also other booby species.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectSexual size dimorphismen_US
dc.subjectResource partitioningen_US
dc.titleBreeding stage, not sex, affects foraging characteristics in masked boobies at Rapa Nuien_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holderThe Author(s) 2020en_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.source.journalBehavioral Ecology and Sociobiologyen_US
dc.relation.projectResearch and Technology Centre (FTZ), University of Kielen_US
dc.source.articlenumber149 (2020)en_US

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