Each experiment consisted of 5-10 exposed groups and 5-10 control groups (each group = 10 beetles). One trial per day was performed with each group of beetles for five days. Each experiment was repeated 4-5 times at different times of the year.
All groups showed an initial orientation reaction which was followed by an adaptation to the apparatus during the last days of the experiment (decreased reaction time). Exposure to weak electromagneticirradiation led to increases in the reaction times at the initial days of the experiments (during orientation reaction), but had no effect on subsequent adaptation. The effects of irradiation were seasonal in nature and differed in the two types of behaviour (the effects were weaker in negative phototaxis reactions than in food-related behaviour).
Peric-Mataruga V et al.
The effect of a static magnetic field on the morphometric characteristics of neurosecretory neurons and corpora allata in the pupae of yellow mealworm Tenebrio molitor (Tenebrionidae).