Badania nad oddziaływaniem warunków hypogeomagnetycznych na organizm zwierzęcy
AbstractThe impact of the geomagnetic field (GMF) on animal organisms has received little study. The current research investigates the effect of the long-term shielding of the geomagnetic field on the entire set of biological parameters of the body as a whole, selected organs, and different types of cells, as well as metabolic and biochemical parameters, reproductive indices, body weight gains and mental state. The results of previous investigations indicate that artificial, anthropogenic disturbances of the geomagnetic field are not without an impact on animal bodies, while the extent of these disturbances is very wide. The study looks at the indicators of welfare such as reproductive capacity and normal growth of young animals, and examines the effect of the long-term (multigenerational) shielding of the geomagnetic field on body weight gains in adult rats and on basic reproductive parameters and weight gains in their offspring. It was found that hypogeomagnetic conditions influence the weight gains of adult rats. This effect depends on sex. For males, the differences compared to control were small in the parental (P) generation but tended to increase over the next generations where the gains of experimental animals were significantly lower. For females, the weight gains of experimental animals in all three generations were higher than those of corresponding control animals. The research showed that the long-term deprivation of the geomagnetic field has an effect on the metabolism of elements. Based on the results it can be hypothesised that this effect mostly concerns a group of magnetic elements (in this case, iron and copper). In all the generations, the accumulation of these elements was significantly lower than in control groups. Hypogeomagnetic conditions had also an effect on the sodium and potassium balance over three generations, mainly P and F2. The blood leukocyte count in rats exposed to hypogeomagnetic conditions was found to increase with the decreasing percentage of lymphocytes. In addition, the P and F2 experimental males showed a significant decrease in the platelet count. As indicated by the level of ACTH and corticosterone, which reflects the stress status and is indicative of the HPA axis stimulation, the reactivity to hypogeomagnetic conditions varied according to sex (greater in females) and generation (higher in the P and F2 generations). A higher secretion of steroid hormones observed in the experimental animals of these generations suggests that the long-term deprivation of GMF may cause chronic stress to animals. The level of hormones and other parameters determined in this study in the Fi generation indicates that the rat organisms attempted to adapt to the changed environmental conditions. The effect of shielding the GMF on the immune system seems to vary according to other unidentified factors. Some literature data indicate that GMF changes may disturb melatonin synthesis and/or metabolism and thus affect the immune system. However, this is not confirmed by the results obtained in this study. In the present study, some rats growing under hypogeomagnetic conditions suffered from blindness (absence of the eyeballs). These cases, occurring in all generations, formed a relatively high proportion (from 4.8% in F1 to 9.1% in F3) of all the young reared to 14 days of age (opening of the eyelids). Histological examination demonstrated that the kidneys of rats from experimental groups, regardless of sex, contained some hyaline material in the urinary space of glomeruli (Figs. 2, 3, 4, 5, 6) or in renal glomeruli. These changes occurred in both the cortical and medullar areas of the kidney. In the P generation, these changes occurred in several animals exposed to hypogeomagnetic conditions, and in the F1 and F2 generations they were found in all animals from both experimental groups. The present results indicate that the geomagnetic field is definitely an important environmental factor that affects the welfare of animals. In the light of this study and literature data, it is concluded that disturbances to this field (whatever their nature) are not without an influence on animal organisms. Further extensive and interdisciplinary research is needed to gain a better insight into the extent and mechanism of GMF disturbances.
|Other language title versions||Effect of hypogeomagnetic conditions on animal organism|
|Publisher||Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, MNiSW |
|Publishing place (Publisher address)||Kraków|
|Book series /Journal (in case of Journal special issue)||Zeszyty Naukowe Uniwersytetu Rolniczego im. Hugona Kołłątaja w Krakowie. Rozprawy, ISSN 1899-3486, (0 pkt)|
|Publication size in sheets||7|
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