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Fig. 2 | Movement Ecology

Fig. 2

From: Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North Sea

Fig. 2

Kernel density surface depicting population spatial usage around the UK using coordinate data collected from light-based geolocators attached to populations of puffins (a = 2007/08, c = 2014/15) and razorbills (b = 2007/08, d = 2014/15) during the entire non-breeding period (Jul-March). Kernel is calculated as the standard bivariate normal density, with higher values representing greater use regions. Individual data points are also overlaid. All individuals for which geolocator data was obtained were included. The difference (2014/15–2007/08) between the scaled kernel density surfaces for both puffins (e) and razorbills (f) are also displayed. Positive values (blue) indicate regions where more individuals were located in the winter of 2014/15, negative values (red) indicate regions where more individuals were located in the winter of 2007/08

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