Fig. 3

Circular plots displaying time of day (UTC + 1) when Atlantic salmon (Salmo salar) smolts left the lake (top panel), left the estuary (middle panel) and arrived at the marine arrays (bottom panel) as indicated by the detections on each receiver. Time of civil twilight in the morning and evening is denoted by the dotted line. The solid lines represent sunrise and sunset and the long-dashed line represents mean movement time. The * indicates where movements were significantly related to time of day