Download AEBR 280 Population trends and breeding population size of black petrels (Procellaria parkinsoni) — 2020/2021 operational report

In 2020/2021, 476 study burrows were monitored within the Great Barrier Island/Aotea study area with 67% occupied by breeding pairs and fledgling success 76.8%. Only 3 burrows were detected from 128 transects across the remaining medium-grade habitat and distance sampling models could not be run. However, within core high- and medium-grade habitat above 300 m, distance sampling proved a robust population estimate method resulting in 4336 breeding pairs.