Facultative sex ratio adjustment in natural populations of wasps: cues of local mate competition and the precision of adaptation. by Burton-Chellew, M, Koevoets, T, Grillenberger, B, Sykes, E, Underwood, S, Bijlsma, K, Gadau, J, van de Zande, L, Beukeboom, L, West, SA, Shuker, D