Friday, August 23, 2019

An estimate of numbers of grey-faced petrels ( Pterodroma macroptera gouldi ) breeding on Moutohora (Whale Island), Bay of Plenty, New Zealand, during 1998-2000

TitleAn estimate of numbers of grey-faced petrels ( Pterodroma macroptera gouldi ) breeding on Moutohora (Whale Island), Bay of Plenty, New Zealand, during 1998-2000
Publication TypeJournal Article
Year of Publication2003
AuthorsImber, MJ, Harrison, M, Wood, SE, Cotter, RN
JournalNotornis
Volume50
Issue1
Pagination23-26
Type of Articlepaper
Keywordsbreeding population, estimate, Grey-faced Petrel, Moutohora, post-predation population recovery, Whale Island
Abstract

Abstract Moutohora (Whale Island) holds the largest surveyed breeding colony of grey-faced petrels (Pterodroma macroptera gouldi). For our estimate of the breeding population, we divided the island into 16 sections within which burrow densities were approximately uniform; the surface areas of these sections were found by planimetry. Apparently completed burrows were counted in 1998-2000 within each section by plots of 2 m radius along linear transects, or by 10 X 10 m contiguous plots. The total estimate (± SE) for the island was 109,000 * 10,000 burrows, which equates to about 95,000 pairs breeding annually, given an occupancy rate of about 87%. The population has apparently more than doubled since Norway rats (Rattus norvegicus) and rabbits (Oyctolagus cuniculus) were eradicated in 1985/87.

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