Low and steady: Minimal change in plastic exposure in Kermadec Petrels in the remote South Pacific

Plastic pollution is increasing in our oceans, and while exposure is also increasing in many wild species, there are exceptions. Understanding which species are at risk is therefore important to identifying conservation priorities and responding to the pollution crisis. Here, we document ingested plastics in Kermadec Petrels ( Pterodroma neglecta ) on uninhabited Henderson Island and Oeno Atoll in the remote South Pacific and compare our results with historical data. While sample sizes are limited, the data suggests plastic ingestion has remained consistent over >30 years, with 23.1% of fledglings ( n = 13) sampled in 2025 containing small quantities of plastics (mean ± SD: 0.0113 ± 0.0061 g, median pieces 2.0). These data contrast with plastic ingestion records for other closely related species in the region, suggesting Kermadec Petrels can selectively avoid consuming plastic, or forage in locations with lower plastic densities, and are therefore at less risk of exposure. • Plastic ingestion remained consistent in Kermadec Petrel over >30 years. • 23% of petrel fledglings sampled in 2025 contained ingested microplastics. • This contrasts with plastic ingestion by other closely related species in the region. • Kermadec Petrels can act as a sentinel of pollution in the remote South Pacific.