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Harbour seals Phoca vitulina are mainly considered a temperate species, but theworld’s northernmost population resides year-round in the high-Arctic archipelago of Svalbard. Inthis study we document post-moulting at-sea movements of 30 individuals from this populationusing satellite relay data loggers deployed in the autumns of 2009 and 2010. All of the sealsshowed a strong preference for the west side of the archipelago, staying mainly in coastal areas(<50 km over the continental shelf), but seldom entering the fjord systems. Distance swam perday, individual home range size, and trip duration increased throughout the winter to a peak thatwas reached when drifting sea ice in the region was at a maximum. No effect of age was observed,but sex differences were significant; males occupied larger areas than females. Habitat selectionwas quantified by modelling time spent in area (TSA) as a function of environmental parametersusing Cox proportional hazard models (CPH). The harbour seals avoided heavy ice concentrations(>50%) but did occupy areas with substantial amounts of drifting ice (5 to 25%). Shallow water(<100 m) and steep bathymetric slopes were preferred to deep water or flat-bottom areas. Harbourseal distribution in Svalbard is largely restricted to coastal areas that are heavily influenced byAtlantic water brought northward in the West Spitsbergen Current; both the temperature andinflux of this water type are predicted to increase in the future. It is thus likely that environmentalconditions in Svalbard in the future will become more favourable for harbour seals

Harbour seal Phoca vitulina movement patterns in the high-Arctic archipelago of Svalbard, Norway