Abstract
Kin selection models of intracolonial conflict over the maternity of males predict that social hymenopteran workers should favour the production of sons and nephews over brothers when the effective mating frequency (m e) of the queen is low (m e<2) but that they should police other workers' reproductive efforts and favour the production of brothers when m e>2. Stingless bees have been used to support these models in that m e within the group is considered low and workers are thought often to monopolise the parentage of males. We genetically analysed 20 worker and 20 male pupae from each of 10 colonies of the stingless bee Scaptotrigona postica (= Scaptotrigona aff. depilis) using six microsatellite loci and demonstrate queen monandry in eight nests and apparent low m e in the other two. However, four colonies contained an additional matriline, possibly due to queen supersedure (serial polygyny), which complicated their genetic structure. Across colonies, workers were responsible for the maternity of 13% of all males. These data are broadly in agreement with predictions from kin selection theory, though the question remains open as to why workers do not secure a greater share of male maternity in this and other stingless bee species in which workers are more closely related to nephews than brothers.
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We thank Wolf Engels and the referees for many useful comments on the manuscript and Sandra Mustafa for assistance in the laboratory. We gratefully acknowledge the support of the FAPESP and the DFG (Pa 632). The work described in this paper conforms to the current laws of Brazil and Germany.
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1The species has also been termed S. aff. depilis in recent publications of L.R. Bego and others
Communicated by R.F.A. Moritz
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Paxton, R.J., Bego, L.R., Shah, M.M. et al. Low mating frequency of queens in the stingless bee Scaptotrigona postica 1 and worker maternity of males. Behav Ecol Sociobiol 53, 174–181 (2003). https://doi.org/10.1007/s00265-002-0561-4
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DOI: https://doi.org/10.1007/s00265-002-0561-4