Fig. 4
Spatial autocorrelation for the 399 individuals from 47 colonies analysed in this study, including 193 individuals from 23 colonies in 2004 (A), 146 individuals from 27 colonies in 2005 (B), 208 individuals form 34 colonies in 2006 (C), and all three datasets (2004, 2005, 2006) combined (D). A total of 13 distance classes of 100 m increments were specified, since the maximum distance between any two colonies in our study site was 1227 m. Intra-colony estimates are indicated at 0 m distance. Points represent mean spatial autocorrelation coefficients for each distance class, for males and females, and error bars represent 95% confidence intervals. Error bars that do not overlap zero represent significant genetic structure. Dotted lines represent linear trendlines for males (black) and females (grey). D The slope of regression (change in r per km) is steeper overall for females (− 0.1) than for males (− 0.08)