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Percentage of “sitting on the water” behaviour of Scopoli’s shearwaters in relation to their distance from fishing vessels. Each point in the graph represents the average percentage of “sitting on the water” calculated from > 110 bird-vessel positions corresponding to a “distance from a vessel” bin of 0.25 km. Two-part piecewise linear regression was used to estimate the “interaction distance” resulting at 1.28 km (95% CI 1.15–1.43 km), as indicated by the dashed line
