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White-chinned petrel population estimate, Disappointment Island (Auckland Islands)

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Abstract

The white-chinned petrel Procellaria aequinoctialis is one of the most frequently observed seabird species captured in fisheries bycatch, yet some populations remain virtually unstudied. The size of the breeding population on the sub-Antarctic Auckland Islands, New Zealand, is unknown. Disappointment Island is thought to be the main white-chinned petrel breeding site in the Auckland Islands, and maybe also in the New Zealand region, and has never had introduced mammalian predators. We estimated the white-chinned petrel breeding population size taking into account the detection probability of burrows via distance sampling and the burrow occupancy rate. Eighty line transects were distributed over the island, with a total line length of 1600 m. Burrows were patchily distributed and most abundant in dense megaherb communities. White-chinned petrel burrow density \( \hat{D } \) was 654 burrows/ha (95 % CI 528–809 burrows/ha), with burrow detection probability \( \hat{p} \) varying among vegetation communities from 0.28 ± 0.02 to 0.43 ± 0.02 (±SE). Mean burrow occupancy was 0.73 ± 0.03. We document an estimated total of 155,500 (125,600–192,500) breeding pairs of white-chinned petrels on Disappointment Island during mid incubation in early January 2015. The relatively high occupancy and density of burrows suggest that Disappointment Island is a key breeding site for white-chinned petrels.

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Acknowledgments

We thank Henk Haazen and the crew of the Tiama for their efforts in getting the team onto and back off Disappointment Island. Graeme Taylor, Graeme Elliott and Kath Walker kindly provided information from prior visits, Barry Baker shared aerial photographs of the island, and Deb Wilson provided statistical advice. We are grateful to the Department of Conservation (DOC) Conservation Services Programme and Southern Islands teams for logistical support, and DOC Rakiura for maintaining daily communications schedules. David Middleton, Bruce Robertson, Richard Wells and Deb Wilson gave valuable feedback on an earlier version of this work, and three anonymous reviewers helped strengthen the work further.

Funding

Financial support was received from the Agreement for the Conservation of Albatrosses and Petrels (Grant 2013-07), the New Zealand Department of Conservation (DOC) Conservation Services Programme, and New Zealand’s National Institute of Water and Atmospheric Research. KRH was supported by a University of Otago doctoral scholarship and a New Zealand Federation of Graduate Women fellowship. Permission to visit Disappointment Island was granted by DOC (Entry Permit 40203-LND).

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Correspondence to Kalinka Rexer-Huber.

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All applicable national and institutional guidelines for the care and use of animals were followed. All procedures were conducted under a DOC research permit (Wildlife Act authority 38414-FAU), in accordance with the University of Otago animal ethics standards (approval 60/14).

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Rexer-Huber, K., Parker, G.C., Sagar, P.M. et al. White-chinned petrel population estimate, Disappointment Island (Auckland Islands). Polar Biol 40, 1053–1061 (2017). https://doi.org/10.1007/s00300-016-2031-x

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