Статьи

HABITAT AND ADAPTATION CHARACTERIZATION OF HEDYSARUM GRANDIFLORUM PALL. (FABÁCEAE, DICOTYLÉDONES) IN THE SOUTHERN VOLGA UPLAND

Authors: Lavrentiev M. V., Boldyrev V. A.

The coenopopulations of Hedysarum grandiflorum Pall. in the southern Volga Upland within the administrative boundaries of the Saratov region were studied for the first time. The relief, parent rocks and soils in their habitats were characterized. Main environmental scales were supplemented by new data. Tolerance amplitudes by vital environmental factors were revealed. Adaptation features of this species to its environment are presented. H. grandiflorum is shown to be a quite stenobiontic species.

COUNTING FEATURE VARIABILITY OF THE CRUCIAN CARP CARASSIUS CARASSIUS (L.) (CYPRINIDAE, ACTINOPTERYGII) FROM SMALL PONDS WITH VARIOUS LEVELS OF ANTHROPOGENIC POLLUTION

Authors: Kotegov B. G.

The intrapopulation and interpopulation variability of ten counting features of the external morphology and skeleton in individuals of the crucian carp from three small ponds differing by their anthropogenic pollution level was studied. A statistically significant trend of the decreasing average population values with increasing the water salinity in the small ponds was revealed for five non-metric osteological signs.

ANADROMOUS STURGEONS (ACIPENSERIDAE, ACTINOPTERYGII) OF THE DON RIVER ABOVE THE TSIMLYANSK DAM

Authors: Boldyrev V. S.

Based on the literature, non-published and survey data, information on the occurrence of anadromous sturgeons after the regulation of the Don River downstream and upstream of the Tsimlyansk Dam is given. There were two peaks of mature adults approaching the dam, namely, in the 1950s and 1980s. The first mass peak was associated with the wild population existed then; the second one was a result of mass artificial breeding.

ASSESSMENT OF THE IMPACT OF MAJOR LIMITING FACTORS ON THE GROWTH OF A VIMBA BREAM POPULATION (VIMBA VIMBA VIMBA) (CYPRINIDAE) - AN INTRODUCED SPECIES IN THE VOLGOGRAD RESERVOIR

Authors: Belyanin I. A., Shashulovsky V. A., Mosiyash S. S.

An attempt was made to estimate the impact of major limiting factors on changes of the vimba population size in the Volgograd reservoir. The vimba population size in the reservoir is already close to its limit by one hypothesis, based on the accessibility of spawning area resources. A 15-fold increase in the vimba population size is possible for at least two decades by another hypothesis, providing for the population restriction by food resources.

ON THE SPECIFIC COMPOSITION, DISTRIBUTION AND ECOLOGY OF VOLES (MAMMALIA, CRICETIDAE, MICROTINA) IN THE NORTH-WESTERN CAUCASUS

Authors: Balakirev A. E., Mironova T. A., Khlyap L. A., Vasilenko L. E., Okulova N. M.

Molecular-genetic typing was done for voles in the vicinity of the Pslukh forest station (the south of the Caucasus nature reserve), the Krasnaya Polyana, and the Utrish nature reserve (the Abrau peninsula). Based on the nucleotide sequence of the mitochondrial cytochrome b gene, the voles from the Krasnaya Polyana and Pslukh station were attributed to Robert’s snow vole (Chionomys roberti), whereas the animals from the Utrish nature reserve belong to the Eastern-European vole (Microtus rossiaemeridionalis).

ECOLOGICAL-PHYTOCENOTIC ASSESSMENT OF THE POPULATION STATUS OF THE RARE SPECIES DICTAMNUS GYMNOSTYLIS STEV. (RUTACEAE, MAGNOLIOPSIDA) IN THE SOUTHERN URALS

Authors: Abramova L. M., Mustafina A. N.

The results of our ecological-phytocenotic assessment of the natural coenopopulations of the rare (in Bashkortostan Republic) species Dictamnus gymnostylis Steven are given. In the Southern Urals, the species is on the northeastern border of its habitat. The ontogenetic, demographic and vitality structures of 20 coenopopulations were studied, the existence optima were found. The majority of the surveyed coenopopulations of D. gymnostylis have densities within 1 - 10 ind./sq.m and an incomplete ontogenetic spectrum, the basic ontogenetic spectrum being centered.

DYNAMICS OF THE ABUNDANCE AND DEMOGRAPHIC STRUCTURE OF POPULATIONS OF THE SMALL WOOD MOUSE (APODEMUS URALENSIS PALLAS, 1811) (RODENTIA, MURIDAE) AT URBANIZED SITES OF THE SOUTHERN TAIGA SUBZONE

Authors: Chernousova N. F.

The dynamics of abundance and demographic structure of the small wood mouse (Apodemus uralensis Pallas, 1811) at urbanized areas of a pine forest located within the urban limits and exposed to anthropogenic impact of various degree and character was under study during 9 years. No clear relation between the abundance dynamics and the sex ratio dynamics (age ignored) in the populations of A.

DYNAMICS OF THE ABUNDANCE AND COMMUNITY STRUCTURE OF SMALL MAMMALS IN THE SARATOV TRANS-VOLGA REGION

Authors: Tsvetkova A. A., Oparin M. L.

The population of small mammals in different areas of the Saratov Trans-Volga region features long-term and constantly increasing numbers of Sylvaemus uralensis, and its wide distribution in a variety of habitats. The maximum density of S. uralensis is 72.0 ind. per 100 trap-days and the fraction in catches is 73.0%. A tendency is observed to an increasing numbers of Microtus arvalis.

RESTORATION OF A BLACK-HEADED GULL (LARUS RIDIBUNDUS) (CHARADRIIFORMES, AVES) COLONY: THE ROLE OF RELEASERS IN THE FORMATION OF A NEW BIRD COLONY

Authors: Kharitonov S. P., Krasilnikov Y. I., Zvonov B. M., Zolotarev S. S.

Our study was conducted on the Kiyovo Lake situated within the limits of the town Lobnya (Moscow region). Formerly, the lake had held a large colony of the Black-headed Gull. Since 1996, these gulls ceased to breed at this lake. During 2009 - 2015, we managed to restore the colony by the usage of artificial measures.

INFLUENCE OF THE AGROCHEMICAL TREATMENT OF OIL-CONTAMINATED SOIL ON THE ABUNDANCE DYNAMICS OF MESOPHILIC AND PSYCHROPHILIC MICROORGANISMS

Authors: Trusey I. V., Gurevich Y. L., Ladygina V. P.

The influence of a polymeric structure-formation agent, chalk and microorganisms on the numbers of mesophilic and psychrophilic microorganisms in oil-contaminated soil was estimated. A carbamide-formaldehyde structure-formation agent had the most positive effect on microbial growth. Introducing hydrocarbon-degrading bacteria and chalk influenced to a lesser degree.

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