Figure 6

Seasonal and diel distribution of the different bio-duck unit types from the HAFOS data set during 2013 and the multi-year PALAOA data. Every dot represents an hour with AMW acoustic detection. The dot coloring represents the different AMW bio-duck unit types detected in every monitoring position. Y-axes shows date; left X-axis time of the day (hours); right X-axis ice concentration in a 50 km radius. Grey shading represents the periods between sunset and sunrise. Light pink shading represents periods during which no data were collected.