Study type: Medical/biological study (experimental study)

Changes in Honeybee Behavior Parameters under the Influence of the E-Field at 50 Hz and Variable Intensity. med./bio.

Published in: Animals (Basel) 2021; 11 (2): E247

Aim of study (acc. to author)

The effects of exposure to a 50 Hz electric field with variable intensity on the behavior of honeybees should be investigated.

Background/further details

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.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: 1, 3 and 6 hours
Exposure 2: 50 Hz
Exposure duration: 1, 3 and 6 hours
Exposure 3: 50 Hz
Exposure duration: 1, 3 and 6 hours
Exposure 4: 50 Hz
Exposure duration: 1, 3 and 6 hours

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Exposure duration 1, 3 and 6 hours
Exposure setup
Exposure source
Chamber 90 workers were placed in a wooden cage (20 × 15 × 7 cm3); 10 cages per group
Setup the cages were placed in a plate capacitor
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 5 kV/m - measured - -

Exposure 2

Main characteristics
Frequency 50 Hz
Type
Exposure duration 1, 3 and 6 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 11.5 kV/m - measured - -

Exposure 3

Main characteristics
Frequency 50 Hz
Type
Exposure duration 1, 3 and 6 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 23 kV/m - measured - -

Exposure 4

Main characteristics
Frequency 50 Hz
Type
Exposure duration 1, 3 and 6 hours
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 34.5 kV/m - measured - -

Reference articles

  • 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.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

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 Hz electric 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.

Study character:

Study funded by

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