Specialization in workers of Melipona bicolor: the first discharger of larval food in the provisioning and oviposition process (POP) - Pioker, Fabiana Curtopassi; Aponte, Olga Inés Cepeda; Imperatriz-Fonseca, Vera Lucia (Apoidea neotropica: homenagem aos 90 anos de Jesus Santiago Moure, 2003)