Abstracts

Diversity of the Fauna

The scientific reserch of the small mammals population fine and vegetation cover was carried out on constant plots of Nadym site. The plots are situated as in natural conditions, and in conditions broken as a result of construction of a main gas pipeline.

All plots depending on presence permafrost and disturbance were differentiated as follows: thawed disrupted, thawed not disrupted, permafrost disrupted and permafrost not disrupted. On plots was made catching of the small mammals and were registered phytocoenotic parameters (number of species, their mass, abundance, frequency, coverage etc.)

The carried out works have allowed to specify species composition of small mammals of researched area, levels of their number, to estimate condition of small mammals and influence of the anthropogenic factors and geocryological conditions on a level of small mammals relative abundance.

Carried out researches have shown, that on permafrost disrupted territory under influence of linear construction there was a destruction of natural vegetation, lowering of permafrost table up to 5 ì and change of hydrothermal soil regime. It has resulted in occurrence richer in species relation phytocoenoses. Thereof the relative abundance of small mammals has increased in 2 times, and phytomass of secondary vegetative cover - in 2.5 times in comparison with permafrost not disrupted territory.

On thawed not disrupted territory the relative abundance of small mammals in 3 times is higher, and phytomass of surface cover in 2 times is higher, than on thawed disrupted. Probably, natural environment is most favorable for small mammals at given geocryological conditions.

The designed indexes of biodiversity for researched region testify to a low degree of domination at small meanings of species riches and variety, that is characteristic for northern taiga of West Siberia.

The increase of species riches in the disrupted territories is marked in comparison with not disrupted territories. Probably, it is connected to the large variety of environment conditions, generated under influence of anthropogenic factors..

Thus, the executed researches have shown, that the change of the basic ecosystem parameters under influence of the anthropogenic factors essentially differs in various geocryological conditions. The received data will be entered into a database on biodiversity of vegetation and fauna, which is created on area of researches.

Note. Abstracts are published in author's edition

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