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Floral constance in the native bees Bombus pauloensis and Bombus bellicosus. Flower constancy shown by the apids during their foraging trips is a subject of wide debate, both because of the underlying cognitive mechanisms, as for its implication in optimizing the food collection and for the consequences for the botanical species visited. Bumblebees of the genus Bombus have been good models for studying this behavior. In this study, the flower constancy of the native bumblebees Bombus pauloensis and Bombus bellicosus was analyzed in a meadow composed of red clover, white clover and bird‘s foot trefoil. To do this, the botanical species that bumblebees visited during a section of their foraging flight were recorded. Interspecific differences were found in flower constancy. Seventy percent of B. pauloensis and 43.5% of B. bellicosus that visited at least 20 individual flower units (IFU = inflorescences for clovers and flowers for bird‘s foot trefoils) visited a single resource (P <0.001). When analyzing the flights from IFU to IFU, B. pauloensis presented a flight constancy of 98.7% and B. bellicosus of 94.4% (P <0.05). The degree of flower constancy shown by bumblebees would be an adaptive response, where cognitive restrictions, resource availability, competition with other species and efficiency in the extraction of nectar and pollen are involved.

CONSTANCIA FLORAL EN LOS ABEJORROS NATIVOS Bombus pauloensis Y Bombus Bellicosus Constancia floral en abejorros