Fig. 2

Estimated number of individuals of C. aeolicus in Stromboli, based on the cross correlation between the results of image interpretation and field surveys. Bars refer to 95% confidence interval. ‘Isolated’ refers to the number of isolated individuals (counts); ‘Clumped’ refers to the number of individuals in dense vegetation patches (estimates); ‘Surface’ refers to the area of occupancy of the dense vegetation patches (in m2)