A. G. Rogozin

• PhD
• Head of Department at Russian Academy of Sciences

Information on the distribution of three genera of rotifers, Anuraeopsis, Brachionus, and Notholca of the family Brachionidae in the Ural region is summarized based on the author’s research and the analysis of published sources. Data on their localities, biology, and quantitative development in water bodies of the Ural region are presented.

Diatom assemblages from the top levels of botton sediments in Lake Bol’shoe Miassovo (Southern Urals) has been studied. On the basis of species composition and termoindication properties of algae a reconstruction of the thermal regime of the lake for the last 1000 years is made. It is established that its significant change was caused by rapid clim...

The article presents the first study of the long-term dynamics of ice phenomena in lakes of different landscape–climate zones in the Southern Urals. The overwhelming majority of lakes, whatever their typology and geographic occurrence, show a decrease in the duration of the period of ice phenomena at a longer open-water period because of the later...

Morphological decriptions and information on the biology and distribution are given for the first time for fauna of the Urals turbellarians from the Neorhabdocoela order of the Typhloplanidae family: Strongylostoma simplex Meixner 1915, Typhloplanella halleziana (Vejdovsky 1880), Phaenocora rufodorsata (Sekera 1904). The species Typhloplanella hall...

The species diversity of planktonic diatoms in thanatocenoses of bottom sediments in Lake Bol’shoe Miassovo (Southern Urals) has been studied and a reconstruction of the thermal regime of the lake for the last 1000 years is made. It is established that the restructuring of the diatom assemblage and decrease in species diversity in thanatocenoses ar...

New species of Turbellaria were found for the fauna of the Urals in lakes of the Southern Urals: Microstomum giganteum Hallez 1890 (Macrostomida, Microstomidae), Otomesostoma auditivum (Plessis 1874) (Proseriata, Otomesostomidae), and Prorhynchus stagnalis Schultze 1851 (Lecithoepitheliata, Prorhynchidae). The morphology of these species is describ...

Analyzed is the cycle of ice cover lifetime for a typical lake in the South Urals corresponding to the 11-year cycle of solar activity. It is revealed that the amplitude of oscillations of the ice cover lifetime gradually decreases as the contribution of the cyclic component lowers and the impact of the irregular component increases. The linear tre...

Thermoindicator properties of phytoplankton in waterbodies of the Southern Urals are determined, and a list of indicator species is compiled. The groups of stenothermal and eurythermal species, as well as those of cryobiontic, cryophilic, thermophilic, and thermobiontic organisms, have been distinguished. A comparison of the thermal indicators with...

Zelinka and Marvan system was used as a methodological basis for developing a method for measuring thermoindicator properties of zooplankton species, including the determination of thermal valence and indicator weight. A list of indicator species for thermal conditions in the water body was compiled, and the species, in accordance with the water te...

Nitrogen accumulation in tissues of submerged aquatic vegetation with respect to the gradient of biogenic impact is studied in the system of the Bol’shoi Kisegach-Malyi Terenkul’-Tabankul’ lakes (Southern Urals). Nitrogen accumulation depends on the competitive interaction of vegetation with phytoplankton; species specificity for nitrogen accumulat...

The new species of Turbellaria for the Urals fauna were found in lakes of the Southern Urals: Microstomum giganteum Hallez 1890 (Macrostomida, Microstomidae), Otomesostoma auditivum (Plessis 1874) (Proseriata, Otomesostomidae), Prorhynchus stagnalis Schultze 1851 (Lecithoepitheliata, Prorhynchidae). The morphology of these species is described and...

The Argazi reservoir on the Miass River, the oldest reservoir in the Southern Urals, has been investigated. In total 49 species and forms of zooplankton are identified, including new and rare species for the fauna of the Urals. Throughout the reservoir zooplankton has high species diversity and considerable biomass (up to 11 g/m3). Rotifers are the...

New for the Russian fauna species of Turbellaria, Macrostomum hofsteni Rogozin sp. n., M. stepposus Rogozin sp. n. M. karlingi Papi 1953, and Myostenostomum bulbocaudatum Luther 1960 were found in lakes of the Southern Ural. The morphology of these species is described and illustrated, the data on their biology and distribution are given.

One of the topical problems of systematics is the identification of morphological hiatus that allows to differentiate systems of features characterizing taxa at the superspecies level. This problem is often solved by intuitive distinguishing of 1-2 classifying characteristics without taking into account their "weight" and correlation with the other...

The Turbellaria and Dalyelliidae species (Gieysztoriaforeli (Hofsten 1911), G. infundibuliformis (Fuhrmann 1894), G. lugubris (Reisinger 1924), G. ornata (Hofsten 1907), Microdalyellia brevispina (Hofsten 1907), and Microdalyellia ohlsoni Luther 1955), new for the Russian and Ural fauna were found in lakes of the southern Urals and in environs of R...

Gieysztoria triquetra (Fuhrmann 1894) described earlier from central and southern Europe and eastern Asia as the subspecies G. t. orientalis (Nasonov 1929) was found in lakes of the southern Urals. The morphology of this species is described and illustrated, the data on its biology are given. The range of the species was found to be much wider and...

The concentration of Cu and Zn was studied in the surface water layer in seven lakes in the Southern Urals (the east-piedmont limnological region). The investigated lakes are located meridionally at different distances from the Karabash Copper Plant, polluting the atmosphere with toxic substances and turning the adjacent areas into the zone of envi...

Three species of the genus Castrada O. Schmidt 1861 (C. borealis Steinbock 1931, C. instructa Hofsten 1907, C. lanceola (Braun 1885) Luther 1904) and two species of the genus Dalyellia Gieysztor 1938 (D. penicilla (Braun 1885) and D. scoparia (Schmidt 1858)) were described in the Ural fauna for the first time. At the present time, the Urals is the...

Ordination methods were applied to the identification of structural units in the phytoplankton community. The groups of phytoplanktonic species identified by the time gradient and the method of cluster analysis of species lists were compared. The structural complexity of the phytoplankton community was evaluated using the index of cenotic significa...

In studies of zooplankton of oligotrophic Lake Turgoyak subjected to intensive anthropic load, it has been found that both oligotrophic and typical eutrophic features are characteristic of this water body. A similar statement is true of other hydrobiological parameters. From this follows the conclusion that a mosaic pattern of indicator values is r...

The first part of this study (Rogozin, 2000) considered the relationships between the trophic status of lakes and the zooplankton structure at the population level. It is obvious that the species populations of aquatic organisms form complexes characterized by a certain species composition, ecological similarity of constituent species, and spatial...

The index of cenotic significance and other indices calculated on its basis were used for revealing specific structural features of zooplanktonic communities in lakes differing in productivity. The results showed that new indices (complexity coefficient, index of cenotic significance of dominant species, and integrated cenotic significance of the z...

The structure of the cuticular apparatus of the male copulatory organs in turbellarians of the family Dalyelliidae (genera Dalyellia, Microdalyellia and Castrella) is examined with reference to common principles of system genesis. Morphological series were constructed that illustrate possible pathways of evolutionary transformations of the cuticula...

The turbellarian fauna of the Urals, Siberia, and the Far East includes a considerable number of poorly described or incorrectly identified species. Examination of the literature from a contemporary point of view makes it possible to provide a list of 66 species of rhabdocoel turbellarians for Eastern Russia.

Uses Cole's coefficient of interspecific association. An example is provided to illustrate the technique. Results suggest that the identified groups of associated species are sufficiently natural to be interpreted as synecological groups. -after Journal summary