Langlois Lopez, SamuelBond, ALO’Hanlon, Nina JWilson, Jared MVitz, AndrewMostello, Carolyn SHamilton, FrederickRail, Jean-FrançoisWelch, LindaBoettcher, RuthWilhelm, Sabina IAnker-Nilssen, TychoDaunt, FrancisMasden, Elizabeth2022-11-252022-11-252022-05-132022-01-17: Langlois Lopez S, Bond AL, O’Hanlon NJ, Wilson JM, Vitz A, Mostello CS, Hamilton F, Rail J-F, Welch L, Boettcher R, Wilhelm SI, Anker-Nilssen T, Daunt F, Masden E (2022). Global population and conservation status of the Great Black-backed Gull Larus marinus. Bird Conservation International,1–11 https://doi.org/10.1017/S09592709220001810959-270910.1017/s0959270922000181http://hdl.handle.net/10141/623034The Great Black-backed Gull Larus marinus is a generalist species that inhabits temperate and arctic coasts of the north Atlantic Ocean. In recent years, there has been growing concern about population declines at local and regional scales; however, there has been no attempt to robustly assess Great Black-backed Gull population trends across its global range. We obtained the most recent population counts across the species’ range and analysed population trends at a global, continental, and national scale over the most recent three-generation period (1985–2021) following IUCN Red List criteria. We found that, globally, the species has declined by 43%–48% over this period (1.2–1.3% per annum, respectively), from an estimated 291,000 breeding pairs to 152,000–165,000 breeding pairs under two different scenarios. North American populations declined more steeply than European ones (68% and 28%, respectively). We recommend that Great Black-backed Gull should be uplisted from ‘Least Concern’ to ‘Vulnerable’ on the IUCN Red List of Threatened Species under criterion A2 (an estimated reduction in population size >30% over three generations).enopenAccesshttps://creativecommons.org/licenses/by/4.0/Journal Article1474-0001Bird Conservation International2022-11-241-11Larus gullsgull populationspopulation assessmentpopulation ecologybird conservation