Figure 1

First two canonical functions for the four groups of locusts obtained by canonical discriminant analysis of the measurements of four morphometric variables (a) and eleven behavioural variables (b). Note: MI, Locusts from Madagascar with an experimental rearing history of isolation; MC, Locusts from Madagascar with an experimental rearing history of crowding; FI, Locusts from France with an experimental rearing history of isolation; FC, Locusts from France with an experimental rearing history of crowding; CF1, First canonical function; CF2, Second canonical function. The ellipses correspond to 95% confidence ellipses. Arrows show the significant distances between the centroids of groups from the same population of origin with experimental rearing histories of isolation and crowding, as well as directions of gregarisation.