The bees were divided into the following groups: Exposure to an electric field of 1) 5 kV/m, 2) 11.5 kV/m, 3) 23 kV/m, 4) 34.5 kV/m and 5) control group for a) 1 hour, b) 3 hours, and c) 6 hours. In each group (1a-5c), 60 bees were studied, respectively.
Migdał P et al.
(2020):
Changes of selected biochemical parameters of the honeybee under the influence of an electric field at 50 Hz and variable intensities
cognitive/behavioral endpoints: basic bee behaviors: frequency and duration of occurrences of walking, rooming, flying, stillness, contact between individuals, wings moving during a observation period of 300 second (software-assisted observation)
Several significant differences were found between the different groups, i.e., between different electric field strengths and exposure durations. In general, exposure to an electric field for 3 hours (groups b) caused a decrease in the time that bees spent on behaviors and in the frequency of occurrences compared to the other exposure durations independently from the eletric field strength. After 6 hours (groups c), the parameters increased within the groups, as was the case with 1 hour exposure (groups a). Despite this, no return to reference values (control groups) was observed in any of the exposure groups. The authors concluded that exposure to a 50 Hzelectric field might change the behavior of honeybees. However, bees may be able to adapt to such an exposure to a certain extent or tolerate it for some time.
Wroclaw University of Environmental and Life Sciences, Poland
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