Published in Biology Bulletin
AbstractIn a model experiment, an attempt was made to falsify (refute) a deduction from the mathematical justification of winter route counting (WRC) of game animals, which is the mathematical expectation of the proportionality coefficient of this count being equal to π/2. A simulation was carried out using the MapInfo software. The essence of our ...
Published in Biology Bulletin
AbstractDuring our field research in March–May of 2017–2020 in the valley of the Latryk River (Saratov region), it was found that the phenological norm of the beginning of the nesting period of Acanthis cannabina should be dated as the last decade of April. However, under conditions of the local climate transformation, its stability is lost and the...
Published in Biology Bulletin
AbstractComplex song has been described in several songbird species, but few studies have dealt with intra-individual variability in song bout organization. In this study, we compared the song bouts of 19 Radde’s warbler males recorded either on three (11 males) or two (eight males) different days with a lag of 1–17 days between the successive reco...
Published in Biology Bulletin
AbstractAn attempt has been made to assess the status and trends of ecosystems of different types of reservoirs in Europe and Asia (the Saratov and Volgograd reservoirs, closing the Volga cascade, and the Iriklinskii Reservoir, which is the largest on the Ural River) on the basis of the relationship among basic hydrochemical parameters. The ecologi...
Published in Biology Bulletin
AbstractThe variability of the body shape of minnows in populations from different-size watercourses of the Sylva River basin (Middle Urals) is studied by geometric morphometrics. Twenty-six homologous landmarks were used to describe the body shape variability of the fish. Four geographically adjacent minnow populations isolated by artificial and n...
Published in Biology Bulletin
AbstractBy the beginning of the 1970s, only two large regions with natural vegetation, namely the Volga–Akhtuba floodplain and the Volga delta, had remained in the Volga River valley. The largest part of the remaining valley had been converted into a cascade of reservoirs. The conservation of meadow, marsh, and forest plant communities in the lower...
Published in Biology Bulletin
AbstractA brief review of the recent state of research on the dynamics of sea-bottom communities is given together with a revision of the basic concepts and models. It precedes a special issue of the Journal devoted to the results of particular studies on benthic communities on different spatial and temporal scales.
Published in Biology Bulletin
AbstractA new species of dendrochirotid holothurian, Cucumaria fedotovi sp. nov. (Holothuroidea, Dendrochirotida, Cucumariidae), has been described in the Karaginskii Gulf, Bering Sea, Russia, from the depths of 31–34 m. The new species differs from the other species of the genus Cucumaria by the shape of ossicles of the body skin and by tube feets...
Published in Biology Bulletin
AbstractThis paper presents a preliminary analysis of the morphological, physiological, and biochemical parameters of somatic growth in the Black Sea scallop, Flexopecten glaberponticus Bucguoy, Dautzenberg et Dollfus 1889, from a coastal site near Sevastopol, Crimea. The species is one of the few marine Black Sea mollusks listed in the Red Book of...
Published in Biology Bulletin
AbstractThis paper presents data on the effect of gall mites on the state of the photosynthetic apparatus of the leaves of woody plants. The material was collected from the territory of the Dendropark of Foresters of Kirov oblast, located within the city of Kirov (a subzone of the southern taiga). To estimate the degree of plant damage by gall mite...
