Fig. 2.

Seasonality of mean body size (measured as wing length) of M-form A. gambiae (A, females; B, males; note the difference in scale due to sexual dimorphism) collected from a village in the Sahel (M'Piabougou, open circles) and near the Niger River (N'Gabakoro Droit, filled circles). Error bars are ±1 s.e.m. Letters above (Sahel) and below (riparian) time points show significance groupings by REGWQ tests (see Materials and methods) within each location–sex combination. The grey shaded area indicates the sampling periods during the dry season.