In the experimental group, Drosophila subobscura was exposed as a larvae (egg-first instar larvae, n=75 per vial) or as just eclosed adults (n=35). Additionally, a control group (n=20) without any treatment and a sham exposed group (egg: n=75, adult: n=75) were examined in the same developmental stages.
Exposure duration: continuous for 48 hours
|Exposure duration||continuous for 48 hours|
|Chamber||larvae were exposed in petri dishes, adult flies were exposed in 60 m3 vials|
|Setup||magnetic field was generated by electromagnet consisting of three circular coils (37 cm diameter) of insulted copper wire (0.75 mm diameter); distance of coils to each other 23 cm, homogeneous magnetic field in a horizontal direction; no observed fluctuations in temperature or vibrations|
|Sham exposure||A sham exposure was conducted.|
|magnetic flux density||0.5 mT||-||measured||-||± 0.01 mT|
The results of the control without treatment and the sham exposed group showed no significant differences. Hence, they were cumulated and used as one control group.
No difference in the sex ratio between exposed and control flies was observed.
The development of the flies was significantly faster in the exposure group compared to the control group. Both, starting and finishing of eclosing took place one day earlier in the exposure group than in the control group. Additionally, in exposed flies the viability was significantly increased compared to the control group.
In both developmental stages, the locomotor activity of exposed flies was significantly increased in comparison to the control group.
The authors conclude that exposure to a 50 Hz-magnetic field could influence the viability, development and locomotor activity of Drosophila subobscura.