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This interference does not stem from power lines or mobile phone networks", Mouritsen stresses, explaining that electromagnetic interference within the two kilohertz to five megahertz frequency range is mainly generated by electronic devices.
The surprising thing here, the biologist adds, was that the intensity of the interference was far below the limits defined by the International Commission on Non-Ionizing Radiation Protection and the WHO.
Considering the potential importance of the finding, Mouritsen and his team performed a large number of experiments to provide evidence of the effect they observed: “Over the course of seven years we carried out numerous experiments and collected reliable evidence, in order to be absolutely certain that the effect actually exists.” Under the leadership of Svenja Engels, Mourtisen's doctorate students conducted numerous so-called double-blind studies.
For around 50 years it has been known that migratory birds use the Earth's magnetic field to determine their migratory direction.
Biologists have proven this in numerous experiments in which they tested the birds' navigation abilities in so-called orientation cages.
Several generations of students repeated the experiments independently of one another on the Oldenburg campus.