Краткие сообщения

PECULIARITIES OF FEEDING AND DAILY ACTIVITY OF ANTS OF GENUS FORMICA (INSECTA, HYMENOPTERA) IN FOREST-STEPPE BIOTOPES OF SARATOV REGION

The paper presents the results of our research on the foraging activity of ants in forest-steppe biotopes of the Saratov region. The food spectrum of ants was found to include small invertebrates (mainly insects), plant seeds and aphid honeydew. Ants are able to switch to the most massive type of food. F. pratensis behaves as a species with a daytime or morning-evening activity type, depending on the weather conditions. F. rufa is a species with a daily activity type.

BROWN BEAR (URSUS ARCTOS) (CARNIVORA, MAMMALIA) DENS OF THE KRONOTSKY NATURE RESERVE

Seventeen brown bear dens were studied in the Kronotsky Nature Reserve (Russian Far East). The majority of dens were excavated in the ground. The dens were located mainly in the upper part of slopes with southwest aspects in birch forests, dwarf Siberian pine and alder patches. The structure of the dens was typical for brown bear ground dens. There are places in the basin of Shumnaya River in Kamchatka where brown bears prefer to set up their dens.

POLLUTION ASSESSMENT OF THE AQUATIC ENVIRONMENT WITH THE USE OF DIALYSIS CYANOBACTERIA CULTURES

An approach to allow monitoring contamination of watercourses by registering changes in the space-time parameters of cells and their external structures by ATR-IR spectroscopy with the use of dialysis cultures of Synechococсus sp. PCC 6301 is offered.

EFFECT OF A LOW-INTENSITY 30 MHz ELECTROMAGNETIC FIELD ON DAPHNIA MAGNA STRAUS (DAPHNIIDAE, CRUSTACEA) CRUSTACEANS OF VARIOUS AGES

The results of action of a low-intensity 30 MHz electromagnetic field (EMF) in continuous mode and when amplitude modulation with a 1000 s exposure on Daphnia magna Straus, 1820 crustaceans from a laboratory culture (newborn, 5 - 7 and 7 - 9 day aged) are presented. Observations were carried out of the irradiated parent generation and three subsequent ones (F1 - F3) with no exposure.

MORPHO-ANATOMICAL SEED ADAPTATION OF SOME SPECIES FROM THE IRIS L. (IRIDACEAE, ASPARAGALES) GENUS OF THE SARATOV REGIONAL FLORA TO ENVIRONMENTAL CONDITIONS

Morpho-anatomical features of the seeds of seven species from the Iris genus of the Saratov regional flora, which are important in plant adaptation to environmental habitat conditions, are presented. The seeds of two species, namely: I. halophila Pall. and Iris pseudacorus L. seem the most revealing from this viewpoint. The strategy of I.

REGULARITIES OF THE RATIO OF THE SHELL LENGTH TO THE INDIVIDUAL WEIGHT OF MOLLUSKS FROM THE DREISSENA GENUS (DREISSENIDAE, BIVALVIA) IN THE VOLGOGRAD RESERVOIR

A regression analysis of the size and weight structure of the dreissenidae (D. bugensis and D. polymorpha) from the Volgograd reservoir was carried out. The power-dependence parameters in the resulting equation are different for the two mollusk species studied (W = 0.036L3.33 for D. bugensis and W = 0.064L3.32 for D. polymorpha). The established regression relationship between the individual body weight (W) and the mollusk’s shell length (L) has a high correlation degree: R2 = 0.96 for p = 0.01.

Ecological peculiarities of the nesting and reproduction of Haematopus ostralegus longipes Buturlin, 1910 (Haematopodidae, Charadriiformes) in the course of the Medveditsa river (Saratov region)

The Haematopus ostralegus longipes population numbers in the conditions of the middle reaches of the Medveditsa river in the nesting period of 1996 – 2008 was stable, namely, 3 pairs, of which two, rarely three ones, nested annually. The egg laying size was 2–3 eggs. In the course of our many-year survey, a tendency has been established to significant reducing the reproduction success level against the background of transformations of the nesting and feeding stations, which is determined by the long-term tendency to reducing the water content in the river.