Статьи

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

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.

ENVIRONMENTAL ORGANIZATION OF THE SPATIAL-TYPOLOGICAL DIVERSITY OF COMMUNITIES OF AMPHIBIANS, REPTILES AND SMALL MAMMALS IN THE WEST SIBERIAN PLAIN

The differences in estimates of the relation of the population diversity of amphibians, reptiles and small mammals with environmental factors were analyzed by the species’ abundance and contributions to the Shannon index on the basis of their energy indices, as well as the difference in general representations of the spatial-typological variability of the communities of these animal groups with the West Siberian Plain as an example.

ON INCREASING THE ACCURACY OF HUNTING ANIMAL ACCOUNTING IN SMALL AREAS

The possibility of increasing the accuracy of hunting animal accounting by replacing the average values of various accounting parameters obtained for small areas by the average values of the same parameters obtained for larger areas is considered with the results of our winter route account of the moose Alces alces Linnaeus, 1758, held in the Saratov region as an example.

VITALITY DYNAMICS OF TULIPA GESNERIANA L. (LILIACEAE, LILIOPSIDA) POPULATIONS IN THE LOWER VOLGA REGION AND ADJACENT TERRITORIES

The vitality of 38 Tulipa gesneriana populations in the Lower Volga region and adjacent territories was monitored during four agricultural seasons (2013 - 2016). A significant variability of this parameter, correlated with certain geographical trends, is shown within the territory surveyed. Two population clusters were revealed, differing by oppositely directed responses to external factors. A similar variability character was also obtained from ordination of the studied cenopopulations using the average values of morphological traits by means of the principal component analysis.

ON THE DISTRIBUTION OF CAULINIA MINOR (ALL.) COSS. ET GERM. (HYDROCARITACEAE, LILIOPSIDA) ON THE TERRITORY OF THE NIZHNY NOVGOROD REGION

The results of our analysis of the Caulinia minor distribution in the Nizhny Novgorod region on the basis of published sources, herbaria samples and the authors’ original data are presented. The species preferring water bodies with well-warmed shoals and high mineralization levels was revealed. The species entering the Red Data Book is justified due to its location on the border of the habitat. It is proposed to promote the rarity status of the species in the region; recommendations on its conservation are given.

SALINITY INFLUENCE ON CHIRONOMID LARVAE (DIPTERA, CHIRONOMIDAE) IN THE CRIMEAN HYPERSALINE LAKES

The paper summarizes the results of our long-term research (2007 - 2015) of chironomids in 38 saline and hypersaline lakes in the Crimea. Chironomid larvae were found at salinities up to 340 g/l, and their occurrence frequency decreased as salinity rose above 30 - 50 g/l. Four species, namely, Baeotendipes noctivagus, Cricotopus gr. cylindraceus, Tanytarsus gr. Mendax, and Paratanytarsus gr. quantuplex were identified.

HISTORY OF BIRD STUDIES IN THE VOLGOGRAD REGION

On the territory of the contemporary Volgograd region, bird studies began in the second half of the 18th century. First ones were conducted by the heads of large academic expeditions, namely: S. G. Gmelin (1771, 1777), I. I. Lepekhin (1771, 1795), and P. S. Pallas (1788). Therefore, this period of ornithological research can be called the “academic period”.

CHEMICAL SIGNALS OF CONSPECIFICS AND THEIR ROLE IN THE SEASONAL RELATIONSHIPS IN THE MONGOLIAN HAMSTER (ALLOCRICETULUS CURTATUS) (CRICETINAE, RODENTIA)

The hormonal response of males of the Allocricetulus curtatus hamster to the natural excreta (urine and midventral gland secretion [MVGS]) of conspecific females during several seasons of the year was studied when the animals were kept in the conditions of natural light and temperature. In the autumn, no significant changes in the testosterone level in the blood of males for any of the signals presented were observed. In the winter and summer, there was a trend of increasing this indicator in response to the smells of urine and MVGS of females in their diestrus state.

PERCULARITIES OF HYDROCARBON DEGRADATION BY BACTERIA ISOLATED FROM DRILL SLUDGE

Some microorganisms isolated from drill sludge (Bacillus circulans NSh, B. firmus OBR 1.1, B. firmus OBR 3.1, Solibacillus silvestris OBR 3.2, B. circulans OBR 3.3, Halomonas sp. OBR 1, and Erwinia rhapontici OBR 4.1) have been shown to be capable of degrading crude oil, mineral oil, and diesel fuel. It has been established that the B. circulans NSh and B. firmus OBR 1.1 bacteria degrade 62 and 32% of crude oil, respectively, in an alkaline medium (pH 9) for 14 days and degrade 42 and 22%, respectively, in a saline medium (10% NaCl).

ABUNDANCE OF TETRAX TETRAX L. 1758 (OTIDIDAE, AVES) IN THE SARATOV REGION

Based on the count data obtained by various methods and their statistical processing, the abundance of the autumn population of Tetrax tetrax in the Saratov Trans-Volga region was estimated from the late 1990s till now. From 2012 to 2016 it averaged about 30,000 individuals, and in the Right Volga Bank region it was one or two orders lower, the species’ distribution there was sporadic. When studying the T. tetrax abundance dynamics, an increase in its population on the studied territory in the first half of the 2000s was established.

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