Fig. 4From: Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North SeaCatch per unit effort (CPUE) per hour data, per ICES statistical rectangle for age class 0 sprat, sandeel, herring and snake pipefish, in quarter 1 in 2008 and 2015. CPUE/hr. values were averaged in each ICES rectangle and displayed as log10(CPUE/hr. + 1). Data were obtained from ICES North Sea IBTS database. Green line indicates the 55° mark, separating the northern and southern North SeaBack to article page