Fig. 1From: Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly speciesNeedle width is a potential source of selection on oviposition traits. a Mean mature needle width (+/- SEM) of different pine species preferred by N. pinetum (white) and N. lecontei (grey). Letters indicate hosts that differ significantly at P < 0.05 (Additional file 1: Table S4). N. pinetum’s preferred host species has significantly thinner needles than those of N. lecontei’s hosts. b A N. lecontei female uses her saw-like ovipositor to carve an egg pocket into a pine needle (Photo by R.K. Bagley)Back to article page