Diet plasticity and links to changing foraging behaviour in the conservation of subantarctic yellow-eyed penguins (Megadyptes antipodes)

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dc.citation.issue5
dc.citation.volume32
dc.contributor.authorMuller CG
dc.contributor.authorChilvers BL
dc.contributor.authorFrench RK
dc.contributor.authorBattley PF
dc.date.accessioned2023-12-15T01:28:02Z
dc.date.accessioned2024-07-25T06:42:04Z
dc.date.available2022-03-12
dc.date.available2023-12-15T01:28:02Z
dc.date.available2024-07-25T06:42:04Z
dc.date.issued2022-05-17
dc.description.abstract1. Diet is a key factor affecting seabird foraging behaviour, ultimately influencing survival, breeding success and long-term population viability. The density and distribution of prey species in the marine environment are influenced by many factors including climate effects such as El Niño southern oscillation and climate change that alter water temperature. 2. While poor quality diet has been implicated as a contributing factor in the decline of some mainland New Zealand yellow-eyed penguin (Megadyptes antipodes) populations, little is known about their diet in the subantarctic where the majority of the species breeds. 3. Blood and feather samples (n = 63) were collected for stable isotope analysis of diet from 25 individual birds breeding on subantarctic Enderby Island, Auckland Islands, New Zealand, from 2015 to 2018. 4. Diet data were analysed by factors such as breeding year, sex and foraging behaviour. Stable isotope analysis demonstrated significant changes in diet during each year of the study, which included both El Niño and La Niña conditions. 5. Diet during El Niño conditions comprised lower trophic level prey, which were more benthic, and found closer to shore than diet during La Niña. 6. Coupled with the reported variable breeding success of yellow-eyed penguins in the subantarctic, variable diet suggests prey availability is likely to be a limiting factor in some years. Prey availability is therefore expected to be a major influence on survival and breeding success of this endangered species in the future, particularly if the effects of climate change become more pronounced. 7. This research highlights an urgent conservation need to identify prey species utilized by the southern population, along with their distribution in time and space, and therefore also the effect of diet on long-term population stability.
dc.description.confidentialfalse
dc.edition.editionMay 2022
dc.format.pagination753-765
dc.identifier.author-urlhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000767851700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationMuller CG, Chilvers BL, French RK, Battley PF. (2022). Diet plasticity and links to changing foraging behaviour in the conservation of subantarctic yellow-eyed penguins (Megadyptes antipodes). Aquatic Conservation: Marine and Freshwater Ecosystems. 32. 5. (pp. 753-765).
dc.identifier.doi10.1002/aqc.3797
dc.identifier.eissn1099-0755
dc.identifier.elements-typejournal-article
dc.identifier.issn1052-7613
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70709
dc.languageEnglish
dc.publisherJohn Wiley and Sons, Ltd
dc.publisher.urihttps://onlinelibrary.wiley.com/doi/10.1002/aqc.3797
dc.relation.isPartOfAquatic Conservation: Marine and Freshwater Ecosystems
dc.rights(c) 2022 The Author/s
dc.rightsCC BY-NC-ND 4.0
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAuckland Islands
dc.subjectbenthic diving
dc.subjectcarbon isotope
dc.subjectclimate change
dc.subjectEl Nino southern oscillation
dc.subjectGPS logger
dc.subjectnitrogen isotope
dc.subjectpelagic diving
dc.subjectstable isotope analysis
dc.subjecttime depth recorder
dc.titleDiet plasticity and links to changing foraging behaviour in the conservation of subantarctic yellow-eyed penguins (Megadyptes antipodes)
dc.typeJournal article
pubs.elements-id452177
pubs.organisational-groupOther
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