Poltarukha О.P., Grintsov V.A.
The morphology of
The new data on the African tropical genus
The new species
The illustrated description of male, female and larva of the water mite
Korotyaev B.A., Gyul'tekin L.
A new species of the genus
The refined data on the distribution of
The data on the proportion of blood cells in newborn pups (white coats), those who finished milk feeding and juvenile moulting (beaters), as well as in adult harp seals of the White Sea population, are presented. Lymphocytes with cells that fulfill the functions of non-induced immunity (large granular lymphocytes) are not revealed in newborn harp seals. They have a lower number of mature differentiated leukocytes than beaters and adults. The elevated number of lymphocytes and their nucleous activity testify to the intensive formation of immunological functions. A high number of eosinophils is a distinguished feature of blood in adults and 3-4-year-old pups of harp seals migrated to the southwestern part of the White Sea. Possible reasons for the differences revealed are discussed.
The diurnal activity and seasonal peculiarities of feeding in the Yuakutian
Berezina N.A., Panov V.E.
In recent time, some amphipod species, including the Baikalian amphipod
The species composition and distribution pattern of insectivorous animals and rodents over the coastal areas in Okhotskii, Ayano-Maiskii, and Tuguro-Chumikanskii raions of the Khabarovsk Krai were studied. The highest number of
The feeding bahavior of glaucous-winged gulls was observed on the Commander Islands during 1992-1993 and 1998-1999. Analysis of 5412 food samples makes it possible to reveal differences in the foraging strategy of breeding and nonbreeding gulls. The preferable food of nonbreeding gulls was the fly
Mikhailov V.V., Kolpashchikov L.A.
In the Taimyr region, aerial counts of the wild reindeer population were not conducted during 7 years since 1993. A balance model forecast for the numbers and age-sex structure of the population between 1993 and 2000 was elaborated on the basis of analyzing the environmental factors affecting its dynamics. According to the forecast, in 2000, the number of the Taimyr wild reindeer population was approximately 1 million individuals. The aerial count of 2000 has verified the predicted data (1.05-1.08 million individuals). Taking into account the correct forecast, the interval for prognosis was prolonged up to 2005. In practice, aerial counts should be combined with calculation of wild reindeer numbers in the period between the terms of counting according to the model elaborated. As a result, the frequency of aerial counts may be reduced, and they may be more productive for the same financial expenses. The parameters of the model and the forecasts may be corrected annually based on the data of terrestrial observations of the animals and pasture status, epidemiological situation, and etc. The approach described may be useful for drawing up of a medium-term forecast for other wild reindeer populations.
Vinokurov N.N., Stepanov A.D.
Sixty-seven Heteroptera species of 10 families are distributed in the forest-tundra and lowland thin stands of northeastern Yakutia. The highest species diversity is characteristic of Muridae (54%) and Saldidae (12% of the total species) families. Tundra and forest-tundra elements are represented by four arctic species
The 20-year investigations showed that in the forest zone, the share of the genus
Shtanchaeva U. Ya.
The paper summarizes results of studying the soil microarthropod fauna in southern highmountain Daghestan (2950-3080 m above sea level). Sixty-five species of oribatids and 27 species of collembolans were found in the region investigated. The structure of microarthropod communities, seasonal dynamics of abundance, and vertical and horizontal distribution of microarthropods in soil was studied.
НЕРОНОВ В.В., НЕРОНОВ В.М.