Abstract
Nest temperature is a crucial variable that determines colony survival in social insects. The successful production and development of a new brood, therefore, depends on stable thermal conditions and limited temperature oscillations. Thermoregulatory processes are useful in controlling both individual activity and for the maintenance of colony temperature. We measured heat production generated by nurse bees working on brood combs of the stingless bee Melipona scutellaris (Hymenoptera, Apidae, Meliponini) in this study; our results enabled us to identify the existence of a new task performed by nurse bees, referred to here as 'hot bees' because of their higher thorax surface temperature (4°C above that of other bees within the brood area). This additional heat has been little studied in stingless bees but is likely the result of thorax muscle contractions or, indeed, the development of this musculature as these are recently emerged individuals. We hypothesize that these 'hot bees' contribute to the maintenance of warmth within the nest brood area.
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