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Age structure variability of Chelidonium majus L. (Papaveraceae) cenopopulations in the Saratov region. – Kashin A.S., Reshetova A.S., Zhulidova T.V. – A study was made on 23 cenopopulations of Chelidonium majus L. in 8 districts of the Saratov region in 2003 – 2006. The age spectra are shown to be most often normal full-membered. High polyvariance of the age structure of the cenopopulations has been revealed. A probable cause of this may be the survey area being located on the border of the species' habitat, which implies the extreme nature and instability of living conditions.
Key words: Chelidonium majus, age structure, cenopopulation, onthogenesis, age status, basic spectrum.
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Gallformers of the Lipara Meigen (Diptera: Chloropidae) genus on common reed (Phragmites australis), their inquilines and parasites on east of the East-European plain. – Narchuk E.P. – Data on gallformers of the Lipara Meigen genus, their grassfly inquilines (Diptera, Chloropidae) and parasites of gallformers living on common reed (Phragmites australis) on southeast of the European Russia are given. Some problems of gallforming, feeding of close species of gallformers and inquilines on Phragmites australis are discussed.
Key words: Diptera, Chloropidae, Phragmites australis, gallformation, inquiline.
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A probable role of Oenanthe isabellina and other birds in the plague enzootic mechanism. – Popov N.V, Sludsky A.A., Zavialov E.V, Udovikov A.I, Tabachishin V.G., Anikin V.V., Konnov N.P. – A possible role of birds (in particular, Oenanthe isabellina) in the plague enzootic mechanism is considered. The existence of an additional chain of plague agent transfer from the soil biocenosis to warm-blooded animals is substantiated. The role of flea parasites, primarily allantonematides, in the plague enzootic phenomenon is discussed. A new hypothesis of the mechanism of plague microbe circulation in its natural foci is presented.
Key words: Oenanthe isabellina, nematode, plague enzootic mechanism, plague microbe biofilm, flea parasite, soil biocenosis, climate factor.
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Species composition and distribution of heterotrophic flagellates in the Middle-Volga wetlands. – Tikhonenkov D.V., Mazei Yu.A. – The heterotrophic flagellate biodiversity and species distribution in boggy ecosystems of the Sura river basin were investigated. 63 species and forms have been identified. The species diversity of cercomonads, euglenids, choanoflagellates, and kinetoplastids is highest. Spumella sp., Paraphysomonas vestita, Bodo saltans, Spongomonas uvella, Bodo designis, Goniomonas truncata, and Heteromita minima are most common species. The heterotrophic flagellate communities were beta-dominant on all the studied scales. Differences in the species structure of heterotrophic flagellates communities, formed in boggy ecosystems of different types, are due to rare species. The species with a high occurrence are equally often observed in all the types of boggy ecosystems.
Key words: heterotrophic flagellate, wetland, Penza region.
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Population composition of Ixodes ticks (human disease vectors) as a marker of the environment status in polluted conditions. – Yushkova O.V., Dubinina H.V., Alekseyev A.N. – Multiyear data (1992 – 2006) to characterize the population composition of the taiga tick Ixodes persulcatus in the changing environmental conditions of the St. Petersburg City vicinity are analyzed. Regularities of the «tick – pathogen / pathogens» system functioning under increasing anthropogenic pressure were revealed by the use of statistical analysis. One of the main consequences of environmental pollution for tick populations is the appearance of some specimens tolerant to an enhanced cadmium content in their bodies. Dissemination of such specimens over time and space, peculiarities of their behavior, increasing in their vector capacity serve markers of environmental pollution and epidemiological territory dangerousness of the habitat of such ticks.
Key words: environment pollution, anthropogenic pressure, heavy metal ion, Ixodes, vector of disease.
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Supplement to the terrestrial mollusk (Gastropoda, Pulmonata) fauna of the Middle-Volga region (Penza region). – Bulavkina O.V., Stoyko T.G. – 38 species of ground shell mollusks from 18 families have been identified in the Penza region. These data update the known information on this group in the Middle-Volga region. 4 species are mentioned for the first time, namely, Acanthinula aculeata, Merdigera obscura, Cepaea vindobonensis, and Helix lucorum. The two last ones are invasive.
Key words: terrestrial mollusk, fauna, Middle-Volga region, Penza region.
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To our knowledge of arboreal oribatid mites of the Nizhniy Novgorod region. – Ermilov S.G., Chistyakov M.P. – Some features of the arboreal oribatid mite population in the Nizhniy Novgorod region are discussed. 74 species of 51 genera, 36 families and 22 superfamilies have been identified. The vertical distribution of oribatid mites on trees was studied. A classification of arboreal oribatid mite species is proposed.
Key words: arboreal oribatid mite, dominate, vertical distribution, seasonal dynamics, classification of oribatid mites.
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Quantity estimation of steppe marmot by the interval technique in Cis-Volga districts of the Saratov region. – Kondratenkov I.A., Oparin M.L., Oparina O.S. – Some techniques to account and calculate the abundance of Marmota bobak via interval estimation of the number of its families at certain sites of its habitat are described. They were applied for quantity estimation of the species in some Cis-Volga districts of the Saratov region in 2000. By our account data, the said territory (above 4 million ha) contained from 27 to 40 thousand individuals of M. bobak in 2000. The trend towards increasing the abundance of M. bobak noted in European and West-Asian steppes of the CIS countries in the last decades takes place in the Saratov region as well. The appearance of M. bobak in a few districts is most likely due to natural processes and reintroduction.
Key words: Marmota bobak, quantity estimation, family number account, average family size.
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Feeding habits of local populations of common spadefoot toad (Pelobates fuscus) in the Volga and Don basin. – Ruchin A.B., Chikhlyaev I.V., Lukiyanov S.V., Ryzhov M.K. – Our 2001 – 2006 surveys on nutrition analysis of the common spadefoot toad (the eastern form) are reported. Different groups of invertebrates prevailed in the diet of each population. The following animals prevailed in the usual alimentary coma: ants and beetles by taxonomic structure, cursorial, flying and creeping forms by mobility, herpetobious and phyllobious by habitation circle.
Key words: Pelobates fuscus, biotop, nutrition, invertebrates.
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On revision of the northern boundary of the Vipera renardi habitat in the Volga region. – Tabachishina I.E., Tabachishin V.G., Shlyakhtin G.V. – The results of our 1998 – 2006 field surveys, the geography of collections in several zoological museums, and the literature data were analyzed. The northern boundary of the Vipera renardi habitat in the Volga region should be run out from the western edge of the Volga Highland on the south of the Saratov Cis-Volga region – north to the Penza region boundary and then northeast through the southeast of the Penza region, south and east of the Ulianovsk region to 54°10' and 54°18' latitude North for the Cis- and Trans-Volga region, respectively. Further the boundary goes north to the Spassk archipelago islands (except the north of the Ulianovsk Cis-Volga region and the southwest of Republic Tatarstan). Then it falls south and embraces the extreme southeast of the Ulianovsk Trans-Volga region and turns southeast through the north of the Samara Trans-Volga region to the Orenburg region boundary. Long-term stabilization of V. renardi in the region is predicted.
Key words: Vipera renardi, biological distribution, spread, habitat boundary.
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Abundance dynamics features of petty vertebrates in the upland oakgrove of the Galichiya Gora reserve. – Ushakov M.V. – The results of our 11-year survey of the abundance dynamics of petty mammals and amphibians along a trap in the upland oakgrove of the Galichiya Gora reserve are presented. The following peculiarities of the abundance dynamics of petty vertebrates have been revealed: a synchronized rise in the abundance of insectivorous and some amphibians during the 1999 – 2001 period, a reduction of the abundance of most species during the whole survey period, a change in the character of the temporal process and the appearance of reconstruction of the seasonal dynamics structure (insectivorous and rodents). Possible causes are discussed.
Key words: insectivorous, rodents, amphibians, abundanceì, Lipetsk region.
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