Resources taken to the nest by Protopolybia exigua (Hymenoptera, Vespidae) in different phases of the colony cycle, in a region of the médio são francisco river, Bahia, Brazil

Abstract

The present study aimed to identify what resources were taken to the nest by workers of Protopolybia exigua (de Saussure), to verify if there is a relationship between physical factors of weather and phases of colony development and the collection of different resources and also to observe if the wasps carry macerated prey in the crop. The species collected nectar (62.8%), wood pulp for nest building (6.1 %), water (2.9%), prey (0.8%) and resin (0.2%). Moreover, workers of P. exigua do carry macerated prey in the crop. There was a positive correlation (r = 0.85, p = 0.0004) between the presence of larvae in the nest and the carrying of solid contents in the crop, which provides strong evidence that this species macerates its prey while still in the field, before taking it to the nest. There was positive influence of the temperature on the collection of nectar (r = 0.89, p = 0.0001) and water (r = 0.46, p = 0.0066) and negative influence of relative air humidity on the collection of the same resources (r = - 0.88, p = 0.0001 and r = - 0.37, p = 0.0160, respectively). Luminosity influenced the gathering of water (r = 0.43, p = 0.0089) and pulp for nest building (r = 0.31, p = 0.0274) and the wind speed did not influence the collection of any resources. Nectar is the main item taken to the nest during all phases of the colony.