Fig. 1From: Migration distance as a selective episode for wing morphology in a migratory insectThe forewing measurements made for each butterfly in ImageJ [38] include the length (l), width (w), and surface area (a). From these measurements we calculated the roundness 4(a/(Ï€l)2) and aspect ratio (l/w). Measurements followed that of [26] and [37] (for roundness)Back to article page