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On the morphology, ecology and distribution of Thalassiosira weissflogii (Bacillariophyta). - Genkal S.I. and Kulikovskiy M.S. - New material on Thalassiosira weissflogii is analyzed. It shows wider morphological variability of diagnostic features and allows the structure and location of some structural elements of the valve as well as some ecological peculiarities and distribution of the species to be defined more accurately.
Key words: phytoplankton, Bacillariophyta, Thalassiosira weissflogii, morphology, ecology, distribution.
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Small-town flora synanthropization (with Balashov town as an example). - Infantov A.A. and Zolotukhin A.I. - The synanthropic component of the Balashov town flora is analyzed. It contains 253 plant species. The data obtained were systemized by basic families, biological spectrum, ecological and coenotic spectra. An adventive component of the flora has been resolved and an economic estimation of the most dynamically propagating species is given. Adventive species with a high potential of introduction into various types of communities, in particular, Ambrosia trifida L., have been revealed. The synanthropic flora has a considerable quantity of ruderals and a raised quantity of weeds.
Key words: synanthropic flora, adventive species, Ambrosia trifida, Balashov.
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Status of Antennaria dioica (L.). Gaertn. cenopopulations in the Saratov region. - Kashin A.S., Zhulidova T.V., Parkhomenko V.M., Berezutski M.A., and Kirillova I.M. - The cenopopulations of Antennaria dioica (L.). Gaertn. in the Saratov region were surveyed. A sharp reduction of the habitat has been revealed: the species is preserved extremely sporadically only on placoric sites in the watershed part of the Volga Height in places poorly accessible for human economic activity, in old rarefied pine or mixed forests with a kept 'retinue' of their accompanying species. The productivity of the cenopopulations essentially varies in years. In the years adverse for the species the specificity of the biotope influences the productivity to a greater degree than in the favorable years. May climatic conditions (temperature and precipitation) are basic factors to limit the vital status of the plants. No apomixis is peculiar to the plants growing over the territory. They propagate amfimatically and/or vegetatively only. The actual seed productivity of plants in the cenopopulations is high enough (40.3 - 43.2%).
Key words: Antennaria dioica, distribution, cenopopulation, productivity, vitality.
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Helminthic communities in sand lizard (Lacerta agilis) from the Southern Middle-Volga region. - Kirillov A.A. - The helminthic communities of sand lizard from the Samara region were examined in 1996 - 2002. 10 parasite species in the reptiles were noted. Characteristics of the helminthic infracommunities and component communities of sand lizard are given. A comparative analysis of the helminthic communities of sand lizard from several districts of the territory under survey is made.
Key words: helminthic community, sand lizard, Samara region.
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Dynamics of the helminth community of bank vole (Clethrionomys glareolus) in subsequent years. - Kirillova N.Yu. - The structure of the helminth community of bank vole from Zhiguli State Nature Reserve in 2000 - 2003 is analyzed. The helminth community of the rodent totals 19 parasite species. Of them 10 ones have been observed during all the four survey years and form the core of the helminth community of the animal. Changes in the helminth community of bank vole concern rare and sole parasite species. Dominant and subdominant helminth species have been observed in the animal year after year as a result of realization of basic trophic contacts of the rodents.
Key words: helminth, community, bank vole, Zhiguli State Nature Reserve.
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Pine Marten Martes martes (Linnaeus, 1758) information field in the snow period in the steppe forests of Ukraine. - Mikheyev A.V. - The pine marten tracking activity in the steppe forests of the southeast Ukraine under snow cover conditions is characterized on the basis of materials of field surveys. The sign loading intensity of the information field (IF) of the species is 29.05+16.83 signs/route km on the average. The increase of the number of signs depends on the snow age almost linearly (Pearson's r = 0.87). The IF biogeocenotic core (79.05% of all the revealed signs) is made by the typical (for the area under survey) forest biogeocenoses such as hazel plantings, oakeries, mixed oak and pine forests, native pine forests. The marten tracking activity dynamics is determined by the physical characteristics of the snow cover and the ecological specificity of separate biotopes. The sign distribution of a separate animal in the conditions of snow cover is characterized as casual or, rather, aggregated to a various degree. With time a complex of interrelated signal IF elements is formed on the snow cover. The average distance between signs correlates with snow age to a high negative degree (r = -0.90).
Key words: pine marten, tracking activity, sign, forest biogeocenosis, behavioral ecology.
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On the spatial structure of mixed colonies initiated by gulls on water bodies of the Southern Transurals. - Chukhareva I.P. and Kharitonov S.P. - Surveys were conducted in the colonies of Black-headed and Yellow-legged Gulls on several water bodies of the Chelyabinsk region in 2004 - 2008. The nests of gulls and their satellite species were mapped by means of GPS and a tape-line. Data from 12 mixed colonies were obtained. Black-necked grebe is the main satellite species in the Black-headed gull colonies. One of such mixed colonies was located in such a habitat where the birds were relatively free in their nest site choice. Under these conditions the main colony-formation factor is the social relations between birds. As a result, segregation among gulls and grebes is observed: the center of the colony was occupied by stronger birds while the periphery was populated with weaker ones. In another mixed colony the breeding habitat allowed no free choice of nest sites. Therefore, the nest distribution was almost totally determined by the habitat structure at this place. Other satellite species usually built their nests closer to gull nests than to the nests of the same species. The inter-nest distance depends on the breeding habitat structure.
Key words: colony structure, multi-species colony, gull.
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Predictive mapping of forest ecosystems in geoecology. - Sharaya L.S. - Predictive maps of several features of forest ecosystems were calculated on the basis of statistically significant interrelationships between these features and abiotic factors. The latter ones serve as predictors for interpolation and extrapolation of the measured characteristics to the whole territory covered with forest. The functional parameters of ecosystems are compared for mixed forests and forest-steppe, their predictive map images are presented that contain the corresponding values at each grid point. Interrelationships in the spatial variability of forest ecosystems are discussed, and applicability criteria of this approach are considered.
Key words: predictive mapping, forest ecosystem, abiotic factors, phytocenosis, geomorphometry.
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Steppe vegetation characteristics of Bulbocodium versicolor (Ker-Gawl.) Spreng. inhabitation in the Voronezh region. - Agafonov V.A., Kuznetsov B.I., and Negrobov V.V. - Data on the floristic environment of populations of the rare early-spring species Bulbocodium versicolor (Ker-Gawl.) Spreng, protected on a federal level, are resulted. The places of mass growth of the species are situated on the steppe slopes of beams near Krasnoflotskoe village (Petropavlovsky district, the Voronezh region). In this territory more than 100 species of vascular plants from 21 families are registered, 3 species entering the Red book of the Russian Federation, 16 taxa require special measures of protection in the Voronezh region. The necessity to organize protection of this unique floristic complex in the territory is emphasized.
Key words: steppe flora, rare species, protection.
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Possibilities of applying variation parameters in reptile thermobiology studies. - Chetanov N.A., Litvinov N.A., and Bakiev A.G. - Possible application of the coefficient of variation in reptile thermobiology studies is considered. With data for 3 reptile species as an example, statistical comparisons of the mean-square deviation are carried out. Indices on the basis of variation parameters are offered.
Key words: reptile thermobiology, variation parameters.
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Data on the helminths of edible frog Rana esculenta Linnaeus, 1758 (Anura, Amphibia) in Middle-Volga region. - Chikhlaev I.V., Fayzulin A.I., and Zamaletdinov R.I. - Data on the helminths of edible frog (Rana esculenta Linnaeus, 1758) from the Middle-Volga region are resulted for the first time. These data were obtained during dissection of 15 specimens gathered in Tatarstan Republic and the Samara region in 2007 - 2008. The specific composition counts 11 species, namely: Trematoda - 10, Nematoda - 1. Among the helminths the adult trematoda forms transmitting with food (9 species) predominate, which is due to eating water invertebrates and young amphibians. The fraction of the larval forms of helminths (1) and geonematodes not circulating through trophic chains (1) is insignificant.
Key words: edible frog, Rana esculenta, helminth, trematoda, nematod.
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