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PubMedDate not supplied

[Coccidies genus Eimeria as a bioindicator of radioactive pollution of the biocenose].

The data on coccidies of rodents were collected in Chernobil (1989-1991) and in the regions of radioactive pollution in the Bryansk region of Russia (1992-1999). The surface pollution of experimental plots was different and come from 0.11 to 11.8 MBq/m2. 2185 rodent were examined in all. Thirteen types of coccidies p. Eimeria were found out in 525 small animals. The analysis of changes in morphological characters and oocysts sporulation in dependence of the level of radioactive pollution of biocenose was carried out. It was found out that parametric signs (length, width and form index of oocysts) were independent from radioactive pollution. At the some time the radioactive pollution renders a significant influence on the nonparametric signs (different types of capsule deformation and internal texture of oocysts) and the process of sporulation. With the increase of radioactive pollution the part of nonsporulated oocycts increased and the quantity of oocysts, corresponding to the description of given type (normal), decreased. This dependence is well described by the equation of logarithmic regression, that allows to use this indexes in the bioindication of the radioactive pollution of the biocenose.

Animals↗
PubMed1997

An assessment of frequencies of micronucleated erythrocytes in peripheral blood of pigeons (Columba livia Gm) living in the polluted radioactive area around the Siberian chemical plant.

We have examined approximately 15,000 pigeons living in the radioactive area polluted by releases of the Siberian Chemical Plant (SChP) as a result of an accident in April 1993. We have detected that almost all of the population of pigeons have a high frequency of micronucleated erythrocytes in their peripheral blood. Moreover, we have found that pigeons living in the downwind cities and towns situated closest to the SChP, particularly in the northern districts of the city of Tomsk and in the closed-city of Tomsk-7 (Seversk), have a significantly high frequency of micronucleated erythrocytes. The assessment of the situation in other Siberian cities has shown that frequencies of micronucleated erythrocytes in pigeons living in Tomsk and Seversk are significantly higher than those in pigeons in the control cities. After the radiation accident the highest frequencies of micronucleated erythrocytes was detected after six months and it gradually decreased over three years but there has been no full normalization. However, full normalization in frequencies of micronucleated erythrocytes in pigeons placed in a vivarium occurred within six months. We have found that frequencies of micronucleated erythrocytes are significantly higher in female pigeons than in males.

Journal Article↗