Variation of B. dorsalis wing size parameters across the
melanic morphs
We found a significant variation of the wing length, wing width, wing
area, wing centroid size and wing loading across the four melanic morphs
of B. dorsalis (Table 1). The sex factor only affected the
centroid size parameters. Flies from morph 2 and 3 had larger wing
length (Fig. 3A.i), width (Fig. 3A.ii), area (Fig. 3A.iii) and centroid
size (Fig. 3A.iv) as compared to those from morph 1 and 4. Flies from
morph 4 possessed a smaller weight (Fig. 3A.v) and wing loading (Fig.
3A.vi). The first two dimensions that accounted for 95.9 % of the total
wing size variation did not separate the four morph of B.
dorsalis (Fig. 3B). Nonetheless, we observed a positive correlation
between all the wing size parameters; with length, width, area, and
centroid size being strongly related (Fig. 3B).
Table 1. Two factors analysis of variance table showing the
variation of wing size and individual weight across the four groups ofB. dorsalis studied.