амфибии

MYELOGRAMS OF MARSH (PELOPHYLAX RIDIBUNDUS) AND POOL FROGS (PELOPHYLAX LESSONAE) (AMPHIBIA: RANIDAE) OF CONVENTIONALLY “BACKGROUND” AND ANTHROPOGENOUSLY TRANSFORMED TERRITORIES IN THE NIZHNIY NOVGOROD REGION

Authors: Romanova E. B., Shapovalova K. V., Mar’in I. A.

Our comparative analysis of the myelograms of these lake and pond frogs has revealed a higher erythropoietic activity of the bone marrow in the conditionally "background" amphibians (group 1) as compared to the individuals from urbanized (group 2) territories. Restructuring of the bone marrow cellular composition and activation of the myeloid cells were the adaptive reaction of the amphibians to living in polluted conditions of their aquatic environment. The response variability of particular myelopoiesis elements reflected the plasticity of the organism’s compensatory abilities.

ON THE CASTOR FIBER (CASTORIDAE, MAMMALIA) ACTIVITY INFLUENCE ON THE ECOSYSTEM BIODIVERSITY OF SMALL RIVERS IN THE FOREST-STEPPE ZONE

Authors: Osipov V. V., Bashinsky I. V., Podshivalina V. N.

Preliminary data on the Castor fiber activity influence on the ecosystem biodiversity of small rivers in three steppe clusters within the State Nature Reserve “Volga forest-steppe” were obtained. With zooplankton, amphibians and fish as examples, it was shown that after beaver-made ponds had appeared, the abundance of all these groups increased. In old ponds, the fish abundance decreases whilst the amphibian one continues to increase. In drained ponds, the zooplankton and amphibian abundance decreases while the fishes become more numerous, due to the appearance of better flowability.