To answer the question whether bumblebee foragers utilise the available photoperiod under continuous daylight conditions, we conducted field experiments with free-flying bumblebees during midsummer in northern Scandinavia. The sun did not set for weeks during our experiments, giving the foragers the opportunity to forage around the clock. We used fully automatic radio-frequency identification (RFID) to monitor the foraging activity of hundreds of individual B. terrestris workers around the clock for several weeks and analysed their circadian foraging rhythms. Since B. terrestris is not native that far north, we also recorded the traffic at the nest entrance of a native B. pascuorum nest.
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