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Medical/biological study (experimental study)

Food collection and response to pheromones in an ant species exposed to electromagnetic radiation.

Published in: Electromagn Biol Med 2013; 32 (3): 315-332

Aim of study (acc. to author)

The effects of exposure to a 900 MHz electromagnetic field on the pheromone response and social food collection behavior of ants should be investigated.
Background/further details: 6 colonies of Myrmica sabuleti ants were used to study the effects of exposure to the electromagnetic field by comparing their behavior before (control) and during/after exposure. These ants had been used in a previous study by the authors (Cammaerts et al. 2012) and had already been exposed to electromagnetic fields there. To ensure their suitability for the present study, their behavior was compared with ants never experimentally exposed to electromagnetic fields prior to exposure. Only slight differences were found and the colonies were deemed adequate.
The exposure consisted of 3 periods of 60 h (12 hours prior to and 2 days during each experiments on pheromone response) and one period of 18 h (12 hours prior to and 6 hours during the test on food collection) with a delay of 3 days between each period.
A pheromone is a chemical factor for information transfer between members of the same species.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: CW
Exposure duration: continuous for 3 x 60 hours and 1 x 18 hours at intervals of 3 days each
Exposure 1
Main characteristics
Frequency 900 MHz
Type
Polarization
Exposure duration continuous for 3 x 60 hours and 1 x 18 hours at intervals of 3 days each
Modulation
Modulation type cf. additional info, CW
Additional info Gaussian Minimum Shift Keying (GMSK) was modulated in accordance to the GSM standard
Exposure setup
Exposure source
Distance between exposed object and exposure source 1 m
Setup a vector signal generator with two channels produced the signal; each channel delivered horizontally polarized electromagnetic waves to three nests over an antenna ; the manufacturer stipulated that the radiation pattern was unidirectional; electrical field pattern over the ants was uniform
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1 V/m - estimated - or 0.77 V/m (?)
power density 1.6 mW/m² - estimated - -
Additional parameter details
power of antenna was set to 10 dBm
Exposed system:

Methods Endpoint/measurement parameters/methodology

  • cognitive/behavioral endpoints: response to pheromone trail (accuracy of following an artificial pheromone trail on a piece of paper), response to area-marking pheromone (count of ants entering and remaining in area scented with that pheromone on a piece of paper), response to alarm pheromone (ant orientation toward the pheromone source, linear and angular speed of ants near the stimulus), social food collection (count of ants at food side, ability to return to nest and recruit helpers)
Investigated material:
Time of investigation:
  • before exposure
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

The responses to the pheromone trail, area-marking pheromone and alarm pheromone as well as the ability for social food collection were significantly deteriorated in exposed ants compared to before the exposure. Exposed ants followed marked trails for only short distances, did not recognize marked areas, no longer orientated themselves to a source of alarm pheromone and became unable to return to their nest during food collection and recruit helpers.
The authors conclude that exposure to a 900 MHz electromagnetic field might impair pheromone response and social food collection behavior in ants.
Study character:

Study funded by

  • not stated/no funding

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