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Inter-colony and inter-annual variation in discard use by albatross chicks revealed using isotopes and regurgitates

2023Journal article Open access
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dc.contributor.authorKuepfer, Amanda
dc.contributor.authorCatry, Paulo
dc.contributor.authorBearhop, Stuart
dc.contributor.authorSherley, Richard
dc.contributor.authorBell, Olivia
dc.contributor.authorNewton, Jason
dc.contributor.authorBrickle, Paul
dc.contributor.authorArkhipkin, Alexander
dc.contributor.authorVotier, Stephen
dc.date.accessioned2024-04-04T14:50:31Z
dc.date.available2024-04-04T14:50:31Z
dc.date.issued2023
dc.description.abstractEffective marine ecosystem monitoring is critical for sustainable management. Monitoring seabird diets can convey important information on ecosystem health and seabird–fishery interactions. The diet of breeding black-browed albatross (Thalassarche melanophris) has previously been assessed using stomach content analysis (SCA) or stable isotope analysis (SIA), but not both methods together. Combining dietary sampling approaches reduces biases associated with using single methods. This study combines SCA and SIA to study the diet of black-browed albatross chicks, with a specific focus on fishery discard consumption, at two Falkland Islands colonies (New Island 51°43′S, 61°18′W and Steeple Jason Island 51°01′S, 61°13′W) during two consecutive breeding seasons (2019 and 2020). SCA provided high taxonomic resolution of short-term diet and priors for stable isotope mixing models, with multiple measures of dietary items (e.g. numeric frequency N%, frequency of occurrence FO%). By contrast, SIA of down feathers provided a single and more integrated dietary signal from throughout chick development. Although the two methods disagreed on the dominant prey group (SCA—crustacean; SIA—pelagic fish), the complementary information suggested a chick diet dominated by natural prey (SCA: 74%–93% [FO], 44%–98% [N]; SIA: minimum 87%–95% contribution). Nonetheless, SCA revealed that a high proportion of breeding adults do take discards. We detected consistent colony-specific diets in relation to prey species, but not in relation to higher discard use. Overall, discard consumption was highest in 2020, the year characterised by the poorest foraging conditions. Our results have implications for fisheries management and future dietary studies assessing discard use.pt_PT
dc.description.sponsorshipFundação para a Ciência e Tecnologia - FCT; ARNET; NERCpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationKuepfer, A., Catry, P., Bearhop, S., Sherley, R. B., Bell, O., Newton, J., Brickle, P., Arkhipkin, A., & Votier, S. C. (2023). Inter-colony and inter-annual variation in discard use by albatross chicks revealed using isotopes and regurgitates. Marine Biology, 170(4), 1–16. https://doi.org/10.1007/s00227-023-04191-7pt_PT
dc.identifier.doi10.1007/s00227-023-04191-7pt_PT
dc.identifier.issn00253162
dc.identifier.urihttp://hdl.handle.net/10400.12/9709
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Verlagpt_PT
dc.relationUIDB/04292/2020pt_PT
dc.relationUIDP/04292/2020pt_PT
dc.relationLA/P/0069/2020pt_PT
dc.relationEK316-03/19, 2264.0420pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectFishery discardspt_PT
dc.subjectSeabird dietpt_PT
dc.subjectStable isotope analysispt_PT
dc.subjectStomach content analysispt_PT
dc.subjectThalassarche melanophrispt_PT
dc.titleInter-colony and inter-annual variation in discard use by albatross chicks revealed using isotopes and regurgitatespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceGermanypt_PT
oaire.citation.issue4pt_PT
oaire.citation.titleMarine Biologypt_PT
oaire.citation.volume170pt_PT
person.familyNameKuepfer
person.familyNameCatry
person.familyNameBearhop
person.familyNameSherley
person.familyNameBell
person.familyNameNewton
person.familyNameBrickle
person.familyNameArkhipkin
person.familyNameVotier
person.givenNameAmanda
person.givenNamePaulo
person.givenNameStuart
person.givenNameRichard
person.givenNameOlivia
person.givenNameJason
person.givenNamePaul
person.givenNameAlexander
person.givenNameStephen
person.identifier290073
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person.identifier.orcid0000-0001-7594-3693
person.identifier.orcid0000-0002-9870-3518
person.identifier.orcid0000-0001-6725-6869
person.identifier.orcid0000-0002-0976-0167
person.identifier.ridI-5408-2013
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person.identifier.scopus-author-id7003725276
person.identifier.scopus-author-id6701787865
person.identifier.scopus-author-id33467793500
person.identifier.scopus-author-id8932510400
person.identifier.scopus-author-id6602631908
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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