Figure 4

Histogram with kernel density curve of observed within-group relatedness of basking shark groups (n = 55) based on LynchRD (left; with the mean 0.0228 shown as a red dashed line) and the likelihood method DyadM (right; with the mean 0.1032 shown as a red dashed line). Groups were sampled around the Isle of Man (IoM, 2009–2013), Ireland (IRE, 2010–2012, 2014), the Moray Firth, Scotland (MF, 2013) and the West Coast of Scotland (SCO, 2012–2014).