“…Generalist trends within eusocial bees have been hypothesized as a response to the (1) high number of individuals in the nest (high demand for resources in the nest and high abundances in the field), (2) eusocial colonies are active throughout the year (especially in tropical zones), and (3) labor division supports a higher diversity of interactions (independent search combined to recruitment foraging behavior) (Lichtenberg et al, 2010;Maia et al, 2019). From the 13 genera of specialist bees identified in the present study, one is a cleptoparasitic (Acanthopus), one is a representative of an oligolectic and solitary clade (Alepidosceles), four are solitary (Anthodioctes, Ariphanarthra, Centris, and Ceratina) and seven present some degree of sociality, from the formation of aggregated nesting sites (Caenohalictus and Callonychium), communal behavior (Agapostemon and Augochlora), variable social behavior (Augochlorella and Augochloropsis), and the primitively eusocial bumblebees (genus Bombus) (Janjic and Packer, 2003;Alves dos Santos, 2004;Coelho, 2004;Michener, 2007;Gonçalves, 2016;Gonçalves, 2019). Although most specialist species are solitary, some are also social, as found in undisturbed forests of north America (Villalobos et al, 2019); thus, both social and solitary bees are prone to adopt specialist behavior (Classen et al, 2020).…”