Using Stable Isotopes to Assign Origin of White-Chinned Petrels Killed by Longline Fisheries

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dc.citation.issue7
dc.citation.volume35
dc.contributor.authorBarquete V
dc.contributor.authorCherel Y
dc.contributor.authorPhillips RA
dc.contributor.authorThompson D
dc.contributor.authorChilvers BL
dc.contributor.authorWanless RM
dc.contributor.authorRyan PG
dc.date.accessioned2025-08-06T02:01:21Z
dc.date.available2025-08-06T02:01:21Z
dc.date.issued2025-07-08
dc.description.abstractIncidental capture (bycatch) of seabirds in longline and trawl fisheries is one of the main threats to many albatrosses and large petrels. The White-chinned Petrel (Procellaria aequinoctialis) has a circumpolar distribution and is the seabird species killed most frequently by fisheries in the Southern Ocean. In an attempt to identify provenance, stable isotope values (δ<sup>13</sup>C and δ<sup>15</sup>N) in feathers from White-chinned Petrels killed in longline fisheries off Brazil, South Africa and New Zealand were compared with those from petrels breeding at five major colonies (South Georgia, Prince Edward, Crozet, Kerguelen and Antipodes Islands). Feather δ<sup>15</sup>N, and to a lesser extent, δ<sup>13</sup>C values in feathers differed among breeding birds sampled at South Georgia, Antipodes Islands and the three Indian Ocean colonies. Given that adult feathers are moulted primarily in temperate waters, away from their colonies, this confirms that most adults from these three regions winter in different areas. Discriminant function analysis of stable isotope values indicated that most petrels killed off Brazil and South Africa were from Atlantic and Indian Ocean populations, respectively. Birds killed in New Zealand fisheries in summer were assigned to populations from all three oceans, with few assigned to the Antipodes; however, we lacked stable isotope data from the Auckland Islands, which is the most likely source population. Identifying the origin of bycaught birds is essential for determining which populations are affected by human activities and for prioritising conservation efforts. This includes targeting of mitigation regulations, monitoring of compliance and bycatch rates, and ensuring cooperation between breeding and non-breeding range states to ensure best practices are adopted in national fisheries and in the high seas.
dc.description.confidentialfalse
dc.edition.editionJuly 2025
dc.identifier.citationBarquete V, Cherel Y, Phillips R, Thompson D, Chilvers B, Wanless R, Ryan P. (2025). Using Stable Isotopes to Assign Origin of White-Chinned Petrels Killed by Longline Fisheries. Aquatic Conservation Marine and Freshwater Ecosystems. 35. 7.
dc.identifier.doi10.1002/aqc.70182
dc.identifier.eissn1099-0755
dc.identifier.elements-typejournal-article
dc.identifier.issn1052-7613
dc.identifier.numbere70182
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/73300
dc.languageEnglish
dc.publisherJohn Wiley and Sons Ltd
dc.publisher.urihttps://onlinelibrary.wiley.com/doi/10.1002/aqc.70182
dc.relation.isPartOfAquatic Conservation Marine and Freshwater Ecosystems
dc.rights(c) The author/sen
dc.rights.licenseCC BYen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectbycatch
dc.subjectfeathers
dc.subjectProcellaria aequinoctialis
dc.subjectprovenance
dc.subjectstable isotopes
dc.titleUsing Stable Isotopes to Assign Origin of White-Chinned Petrels Killed by Longline Fisheries
dc.typeJournal article
pubs.elements-id501632
pubs.organisational-groupOther
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