Abstracts

Diversity of the Fauna

Cartographic synthesis of incomplete analytical data of fauna structure, animal populations diversity and structure, biota geographical features and time dynamics is an important stage in studying animal population of large regions. The map “Small mammals population” was made on the basis of making into a whole data from different source books (188 sources, 252 geographical investigation points), MSU Zoology museum’s and biogeography department’s collections and our own field registrations in South Yamal, North Taymyr, in the Lena delta, the Lower Indigirka, in the region of Pevek. The materials used for making the map were the data base of some small mammals species and populations’ distribution and size “North Biota”. Data base in the aggregate with “Kadaster-reference map of investigation areas” (Emelyanova, Brunov, 1987) make up an information basis of the map of population.

Analysis of the kadaster reference map pointed out that zoology of tundra in Kolsky peninsula (which has the most complicated spatial structure, dynamics and species structure of population), in the area between rivers the Mezen and the Pechora, the Nadym and the Yenisey, the Yana, and the Indigirka has been investigated least of all by the present. Population of Arctic isles (excepting Vrangel Island) have been studied poorly.

The populations species structure and sizes were estimated by years and “high qualities years” (on size) seasons. The map produces dominating and secondary biotops. Spatial draw of the map forms dominating ( predominant on area) populations. Populations of secondary biotops are pointed out in the legend, but not outlined on the map under scale circumstances. Those species rare for tundra (Arvicola terrestris, Microtus gregalis, M.oeconomus, Sorex araneus, S.minutus, S.tundrensis, S.vir, S. daphaenodon, S.cinereus, S.caecutiens, S. minutus) and local populations are indicated with out of scale symbols.

Though the time dynamics of tundra population is quick it’s still investigated poorly. We managed to produce size changes cycles duration and fluctuations amplitudes just for some regions. Species aspects of population changing with time were demonstrated (tundra in Kolsky peninsula).

For making the legend we used geographical-genetic classification of animal population. The principles of classification and its practical use for making a legend were described earlier (Tupikova, 1976, Emelyanova, 1988).

25 typical small mammals population items were selected. The base of tundra population are Lemmus lemmus, L.sibiricus, L. bungei, L. trimucronatus (chrysogaster), Dicrostonyx torquatus, D. groenlandicus (vinogradovi), Microtus middendorffii.

Note. Abstracts are published in author's edition

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