RESEARCH PAPER
The effect of magnetic field on farmed populations of Helix aspersa O. F. Müller, 1774
 
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1
Institute of Animal Husbandry, State Research Institute in Kraków, Poland
 
2
Andrzej Frycz Modrzewski Kraków University, Poland
 
3
Agricultural University of Cracow, Poland
 
 
Submission date: 2009-10-06
 
 
Acceptance date: 2010-11-24
 
 
Publication date: 2011-03-11
 
 
Folia Malacol. 2011;19(1):41–49
 
KEYWORDS
ABSTRACT
In order to assess the effect of alternating electromagnetic and direct magnetic field on adult Helix aspersa O. F. Müller and their eggs, adults and eggs of H. aspersa maxima Taylor and H. aspersa aspersa O. F. Müller were exposed to such fields with different parameters, and the following life cycle traits were observed: condition of hibernating adults, their survival rate during hibernation and reproduction, egg mass, hatching success, growth rate of hatchlings and body mass of next generation adults. Adults were exposed to sinusoidal, alternating electromagnetic fields of 50 Hz, 100 Hz and 200 μT, and magnetic induction of 50 Hz, as well as afield of 175 μT and 10-1000 Hz (repetition period 80 minutes). Egg batches were exposed to direct magneticfields of magnetic induction 5 μT and 10 μT and alternating electromagnetic fields of analogous inductionand frequency of 50 Hz. The effects varied depending on the parameters of the fields, subspecies and life cyclestage. Adult H. aspersa maxima was more sensitive to the changes in characteristics of electromagnetic fieldthan H. aspersa aspersa, but the two subspecies showed a similar reaction to exposing their eggs to direct or alternating magnetic field. Probably direct field had a greater selection effect compared to alternating field, removing weaker genotypes at embryonic stage; this resulted in a greater mean body mass of the next generation adults. The results are preliminary; further studies, with further modifications of parameters of the fields applied are necessary.
 
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