Study site and nest locations.

<p>A, Locations of the two ecological zones (+) and of the eight populations collected (−). YM: Ministère de la Recherche Scientifique et de l'Innovation; YN: North of Yaoundé; YS: South of Yaoundé; YU: Université de Yaoundé I; CA, CB and CC: populations A, B and C in the Campo Forest Reserve; AK: Akok. B, Locations of the nests within each of the eight populations. Populations YM, YN, YS and YU correspond to <i>P. megacephala</i> var. 1 and populations AK, CA, CB and CC to <i>P. megacephala</i> var. 2. Nests belonging to the same supercolony (cf. Results section) are indicated by the same symbol.