Inter-colony and inter-annual variation in discard use by albatross chicks revealed using isotopes and regurgitates
dc.contributor.author | Kuepfer, A | |
dc.contributor.author | Catry, P | |
dc.contributor.author | Bearhop, S | |
dc.contributor.author | Sherley, RB | |
dc.contributor.author | Bell, O | |
dc.contributor.author | Newton, J | |
dc.contributor.author | Brickle, P | |
dc.contributor.author | Arkhipkin, A | |
dc.contributor.author | Votier, SC | |
dc.date.accessioned | 2023-03-27T10:15:23Z | |
dc.date.issued | 2023-03-16 | |
dc.date.updated | 2023-03-27T09:25:27Z | |
dc.description.abstract | Effective 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. | en_GB |
dc.description.sponsorship | Fundação para a Ciência e a Tecnologia (FCT) | en_GB |
dc.description.sponsorship | Fortuna Ltd. | en_GB |
dc.description.sponsorship | Falkland Islands Government | en_GB |
dc.description.sponsorship | Natural Environment Research Council (NERC) | en_GB |
dc.format.extent | 46- | |
dc.identifier.citation | Vol. 170, article 46 | en_GB |
dc.identifier.doi | https://doi.org/10.1007/s00227-023-04191-7 | |
dc.identifier.grantnumber | UIDB/04292/2020 | en_GB |
dc.identifier.grantnumber | UIDP/04292/2020 | en_GB |
dc.identifier.grantnumber | DivRestore/0012/202 | en_GB |
dc.identifier.grantnumber | LA/P/0069/2020 | en_GB |
dc.identifier.grantnumber | EK316-03/19 | en_GB |
dc.identifier.grantnumber | 2264.0420 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/132786 | |
dc.identifier | ORCID: 0000-0002-5864-0129 (Bearhop, Stuart) | |
dc.identifier | ScopusID: 56840336400 | 6701787865 (Bearhop, Stuart) | |
dc.identifier | ResearcherID: G-3105-2012 (Bearhop, Stuart) | |
dc.identifier | ORCID: 0000-0001-7367-9315 (Sherley, Richard B) | |
dc.language.iso | en | en_GB |
dc.publisher | Springer | en_GB |
dc.rights | © The Author(s) 2023. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ | en_GB |
dc.subject | Fishery discards | en_GB |
dc.subject | Seabird diet | en_GB |
dc.subject | Stomach content analysis | en_GB |
dc.subject | Stable isotope analysis | en_GB |
dc.subject | Thalassarche melanophris | en_GB |
dc.title | Inter-colony and inter-annual variation in discard use by albatross chicks revealed using isotopes and regurgitates | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2023-03-27T10:15:23Z | |
dc.identifier.issn | 0025-3162 | |
exeter.article-number | 46 | |
dc.description | This is the final version. Available on open access from Springer via the DOI in this record | en_GB |
dc.description | Data availability: The dataset analysed during the current study is available from the corresponding author on reasonable request. | en_GB |
dc.identifier.eissn | 1432-1793 | |
dc.identifier.journal | Marine Biology | en_GB |
dc.relation.ispartof | Marine Biology, 170(4) | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2023-02-20 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2023-03-16 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2023-03-27T10:11:08Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2023-03-27T10:15:26Z | |
refterms.panel | A | en_GB |
refterms.dateFirstOnline | 2023-03-16 |
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