Download AEBR 270 Population trends, at-sea distribution, and breeding population size of black petrels (Procellaria parkinsoni) on Great Barrier Island/Aotea: 2019–2020 operational report

In 2019–2020, 458 study burrows were monitored within the Great Barrier Island/Aotea study area with 63.1% occupied by breeding pairs and fledging success was 76.5%. Pre-laying foraging trips by 10 adults were 30 days long on average and highly variable. Birds ranged far to the east, west, and north of Aotea and breeding birds made significantly longer trips than non-breeding birds. Distance sampling estimated there were 3130 breeding black petrels within core medium-grade habitat above 300 m.