The same pathway to the Weddell Sea birdlife, after 65 years: similarities in the species composition, richness and abundances

As part of a multi-year study top predators in Antarctica, we conducted seabird shipbased survey on board Almirante Irizar icebreaker the Weddell Sea to Filchner Ice Shelf austral summer 2020. We carried out 10-minute counts along 1843 km during 125 hours observation. analyzed species distributions and relationships with ice cover. registered 15 which four represented more than 85% total abundance: Antarctic petrel Thalassoica antarctica (43.9%), snow Pagodroma nivea (16.3%), Arctic tern Sterna paradisaea (15.2%) emperor penguin Aptenodytes forsteri (10.1%). Species distribution its relationship cover were statistically. The concentration was estimated by using satellite images. compared our results first ship-based bird up 1955/56 analyze possible changes community over time. Out 13 recorded cruise, 11 present this similar abundance proportions. In both cruises, consisted group non-numerous associated icefree waters another very numerous high concentrations similarities between two spaced 65 years apart, suggest temporal persistence central southern that could be explained dynamics presence reproductive colonies within site. current environmental warming is alarming because all individuals belong strongly dependent