Rfa. Moritz et al., ESTIMATING THE CONTRIBUTION OF LAYING WORKERS TO POPULATION FITNESS IN AFRICAN HONEYBEES (APIS-MELLIFERA) WITH MOLECULAR MARKERS, Insectes sociaux, 45(3), 1998, pp. 277-287
Two subspecies of honeybees, Apis mellifera capensis and A. m. scutell
ata provide an ideal model to test for the significance of reproductiv
e workers in natural populations of honeybees. Laying workers of A. m.
capensis parthenogenetically produce female offspring (thelytoky) whe
reas workers of the other subspecies produce male offspring (arrhenoto
ky). By using a two allele marker system in both the mitochondrial (mt
) and in the nuclear (nuc) DNA, a deterministic population genetical m
odel shows that through the differences in laying worker reproduction
alone, dines of the mt and the nuc marker should be shifted. The stron
ger the impact of laying workers the further should the capensis mt ty
pe introgress into the scutellata population. The theoretical model is
supported by empirical data from the hybrid zone between the two subs
pecies. The nuc hybrid zone begins 200 km south of the mt hybrid zone
indicating a significant impact of the laying workers on colony reprod
uction.