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The distributions of many marine birds, particularly those that are highly pelagic, remain poorly known outside the breeding period. Here we use geolocator-immersion loggers to\udstudy trans-equatorial migration, activity patterns and habitat use of sooty shearwaters Puffinus griseus from Kidney Island, Falkland Islands, during the 2008 and 2009 nonbreeding seasons. Between mid March and mid April, adults commenced a ~3 wk, >15 000 km northward migration.\udMost birds (72%) staged in the northwest Atlantic from late April to early June in deep, warm and relatively productive waters west of the Mid-Atlantic Ridge (~43−55° N, ~32−43° W) in what we speculate is an important moulting area. Primary feathers grown during the moult had average\udδ15N and δ13C values of 13.4 ± 1.8‰ and −18.9 ± 0.5‰, respectively. Shearwaters moved into shallow, warm continental shelf waters of the eastern Canadian Grand Bank in mid June and resided there for the northern summer. Migrant Puffinus shearwaters from the southern hemisphere are the primary avian consumers of fish within this ecosystem in summer. During migration birds flew\udfor 78% of the day and 59% of the night, whereas when resident in the northern hemisphere they\udspent much of their time on the water (70% daylight, 90% darkness). Shearwaters moved south late August to mid September, completing the ~30 000 km figure-of-eight round trip migration in ~2 to 3 wk. The Northern Patagonian Shelf and Argentine Basin were used as a terminal stopover\udsite, where most (79%) shearwaters spent ~1 wk before first returning to the breeding colony for the season. Year-round tracking of seabirds aids the identification of important marine areas and highlights regions where conservation efforts need to be focused

Trans-equatorial migration and habitat use by sooty shearwaters Puffinus griseus from the South Atlantic during the nonbreeding season