2010 №1, №2, №3, №4

№1 (2010)

N.V. Mironova

FORMATION OF THE MORPHOLOGICAL STRUCTURE OF GRACILARIA THALLI AT LOW TEMPERATURES

The dynamics of specific rates of increase of Gracilaria verrucosa (Huds.) Papenf. f. procerrima (Esp.) Ag. were studied in terms of morphometric parameters (diameter, length, and number of branches of all orders) of the thalli. The thalli of Gracilaria were exposed to long-term cultivation in the winter-spring period under flow conditions with scaled-up water temperatures from 6 to 17 °С and light intensity 90 and 160 mЕ•м^-2•с^-1. It was revealed that water temperature is the main factor affecting growth and formation of the thallus. At water temperature changes from 6 to 17 °С and light intensity 90 mЕ•м^-2•с^-1 the specific rate of increase of the thalli is 0.001-0.021 day^-1. Under such conditions, branches of the 1-2 orders became thicker by 1.5 times; their number increased by two and seven times, accordingly. Branches of the third order demonstrate the most intensive increase of their number: 45 times. At higher levels of illumination the diameter of the stem increased more than twice, the diameter of the branches of the third order – by two-to-four times. Number of branches of the first order did not change; branches of the second and third orders increased in number by three and six times, accordingly. Under such a regime, the cultivating plants become strongly covered by epiphytes, resulting in a decrease with increases in specific rates from 0.007 to 0.002•day^-1.

E.B. Onoiko

CHLOROPHYLL D  IS  THE  MAJOR  PHOTOSYNTHETIC  PIGMENT  OF ACARYOCHLORIS MARINA MIYASHITA  ET  CHIHARA (CYANOPHYTA)

Data on the unique prokaryotic organism Acaryochloris marina, which synthesizes chlorophyll d as a primary (above 95% of total chlorophyll) photosynthetic pigment supporting oxygenic photosynthesis, were reviewed. Due to its spectral properties, A. marina efficiently uses near infrared light for photosynthesis. Information on photosynthetic apparatus characteristics, structure and organization of photosystems, and the light-harvesting complex of A. marina, its distribution in the nature, and lifestyles in vivo were reported.

L.V. Ladigina

CAROTENOID COMPOSITION IN MICROALGAE FOR LARVAE OF BIVALVE MOLLUSKS

Quantitative composition of microalgae carotenoids, which are used as feed for larvae of the bivalve mollusks, has been investigated. It was stated that carotenoids of the microalgae Isochrysis galbana Parke, Dunaliella viridis Teod., Tetraselmis suecica (Kylin) Butch., and Phaeodactylum tricornutum Bohl. are represented by six fractions: b-carotene, luthein, fucoxantine, diadinoxantin, and xantophylles of the violoxantine row (neoxantine and violoxantine). Total content of carotenoids in the microalgae depends on the phase of the culture growth. The maximal content of all carotenoid fractions was determined in the stationary fractions.  Total content of carotenoids in the microalgae depends on the phase of the culture growth.

V.P. Komaristaya, S.P. Antonenko, A.N. Rudas

CULTIVATION OF DUNALIELLA SALINA TEOD. AT SUBOPTIMAL CONCENTRATIONS AND EXCLUSION OF NITROGEN AND PHOSPHORUS FROM THE MEDIUM
The effect of suboptimal concentration and the exclusion of nitrogen and phosphorus from the medium on b-carotene accumulation by Dunaliella salina Teod. cells, culture growth dynamics, and the uptake of these nutrients under favorable conditions for cell division values of salinity, illumination, and temperature were investigated. Phosphorus exclusion (KH₂PO₄ concentration less than 0.2 mg/L) at suboptimal nitrogen concentrations insertion favored twice more b-carotene accumulation and culture growth than both nutrients’ exclusion or nitrogen exclusion (KNO₃ concentration less than 0.1 mg/L) at suboptimal concentrations of phosphorus. Keeping suboptimal concentrations of both nutrients in the medium (from 20 mg/L KNO₃ and 4 mg/L KH₂PO₄) significantly stimulated culture growth but suppressed carotenogenesis. Keeping constant concentrations of phosphorus in the medium at a level of 45 mg/L of KH₂PO₄ at suboptimal nitrogen concentrations or its exclusion inhibited both culture growth and carotenogenesis. Nitrogen and phosphorus uptake by D. salina cells was maximal at the beginning of growth and proportional to the concentrations of these nutrients in the medium. Mutual dependence of nitrogen and phosphorus uptake of their concentrations was absent. The data obtained may support the specificity of nitrogen and phosphorus depletion effects on the metabolism of D. salinacells. The possible reasons of incompatibility of different investigators data on carotenogenesis induction in D. salina are discussed.

G.V. Pomazkina, O.I. Belykh, V.M. Domysheva, M.V. Sakirko& R.Yu. Gnatovsky

STRUCTURE AND DYNAMICS OF PHYTOPLANKTON OF SOUTHERN BAIKAL (RUSSIA)

Species composition, qualitative indices, and seasonal and inter-annual dynamics of phytoplankton were investigated in the pelagic part of Lake Baikal at the middle cross-section of Listvianka-Tankhoy as well as in the littoral near the settlement Bolshie Koty, Southern Baikal in 2005-2007. The floristic composition of algae of both studied sites is similar, while the variety of species of the littoral was higher, especially in summer. Phytoplankton productivity in the coastal zone was low in 2005; in 2006 it was higher than that in the pelagic zone and in 2007 productive values of both sites were similar.

L.M. Terenko

SEASONAL DYNAMICS OF PHYTOPLANKTON IN THE COASTAL WATERS OF ODESSA BAY IN THE BLACK SEA (UKRAINE)

From 2001 to 2008 seasonal changes were investigated in the coastal phytoplankton of the Odessa Bay in the area of the Odessa University biostation («Biostantsia» – monitoring site). The species composition, quantitative characteristics and distribution of phytoplankton at three stations in this area having different hydrodynamics are given. A total of 236 species and infraspecific taxa of microalgae have been revealed. Maximal densities of phytoplankton were registered in May 2008. The small-sized diatom algae Thalassiosira pseudonana Hasle et Heimdal (32%) and blue-green Merismopedia punctata Meyen (45%) dominated. These are the first results received on studies of the impact of hydrotechnical constructions in the Odessa Bay coastal zone on phytoplankton development.

P.M. Tsarenko

RECOMMENDATION ON STANDARТIZATION OF CYTATION OF THE NAMES OF
AUTORS OF ALGAL TAXA

International materials on quoting of citation of the names of authors of algal taxa taking into account their used variants and modifications are compatible. The used variants of writing of the names of authors of algal taxa and their recommended reductions are marked.

№2 (2010)

V.A. Silkin, I.K. Evstigneeva, V.Y Rygalov

THE DYNAMICS OF GROWTH AND MORPHOFUNCTIONAL PARAMETERS OF THALLUS IN THE CULTURE OF LAURENCIA PAPILLOSA (FORSK.) GREV.

The regularity of formation of morphological structure of Laurencia papillosa (Forsk.) Grev. (Rhodophyta) thallus in bath culture for different temperature (15 and 20 °С) and light intensity (31 and 40 W/m² PАR) were studied. Under transfer of Laurencia from the natural environment into culture the morphological organization follows extensive strategy (increase of the biomass through increasing the diameter and length of axis of thallus) that is most usual in the natural environment. Then the strategy changes for intensive through formation of new growth zones in secondary to quaternary branches but never in primary branches. Increase of the secondary branches for 30 day cultivation was about 180 and increase of the tertiary branches was more 100. As the result, the specific surface increases. In altering one strategy for the other temperature plays an important role and the intensity of light is the essential factor.

A.I. Bozhkov, А.V. Goltvyanskij, Sh. Rostama

CELL AGGREGATES FORMING IN DUNALIELLA VIRIDIS TEOD. CULTURE: A PRIMARY REACTION TO STRESS INDUCED BY HIGH COPPER ION CONCENTRATION

The dynamics of cell aggregates forming in Dunaliella viridis Teod. were studied. Two cultures of D. viridis, sensitive to CuSO₄ (CuS) and resistant to CuSO₄ (CuR), were studied. Almost immediately after the addition of CuSO4 to the culture medium the cells became immobile and formed cell aggregates. The manifestation of these changes depends on the cell culture functional state. Cell recovery after CuSo₄ treatment was investigated. In CuR-culture cell aggregates become separated and cell mobility and cell membrane integrity recovered relatively early. It is demonstrated that cell aggregation is a primary reaction of cells to high concentration of copper ions in the cell culture medium.

N.I. Kirpenko, A.V. Kureischevich

PROTEIN CONTENT IN THE BIOMASS OF UNIALGAL AND MIXED CULTURES OF ALGAE

The protein content in the biomass of unialgal and mixed cultures of some green and blue-green algae was investigated. It was revealed that in mixed cultures the content of proteins sufficiently differed from the expected indices. Depending on peculiarities of the growth, the quantity of endogenous proteins in mixed cultures may be increased (more than 50%) or decreased (40-240%) compared to average indices of protein content in monocultures.

I.K. Evstigneeva, I.N. Tankovskaya

MACROPHYTOBENTHOS AND MACROPHYTOPERIPHYTHON OF RESERVE «SWAN ISLANDS» (BLACK SEA, UKRAINE)

The results of a two-year study on summer vegetation in the «Swan Islands» Reserve are presented. In the littoral area of the Karkinit Bay and in two of its estuaries, 47 species of macrophytes belonging to three divisions of algae and to Magnoliophytawere revealed. Peculiarities of taxonomic and ecological structure of benthic algocenosіs inhabiting firm substrates are analyzed according to the type of water body and year of observation.

O.S. Samylina, L.M. Gerasimenko & N.V. Shadrin

COMPARATIVE CHARACTERISTIC OF THE PHOTOTROPH COMMUNITIES FROM THE MINERAL LAKES OF CRIMEA (UKRAINE) AND ALTAI REGION (RUSSIA)

Phototroph communities were studied in Crimean highly mineralized sulphate-chloride lakes of marine and continental origin, and athalassic carbonate lakes of Altai Region. The diversity of communities providing primary production in mineral water bodies include: cyanobacterial biofilms and mats, algobacterial communities, plant-bacterial mats, cyanobacteria vegetating under mineral deposits, and planktonic communities. Morphology of the first three types is universal; it is similar to phototroph communities of other mineral lakes. Deviations from such structure may be caused both by physical and chemical parameters of environment, and the organism-ediphicator. In Crimean lakes all types of communities mentioned above were recorded, while in the Tantar system of reservoirs – only biofilms and one-year old mats. Biomass of the communities measured by chlorophyll а content, varied from 10 mg chl./m² up to 600 mg chl./m² depending on organisms-ediphicators. Species composition of dominating cyanobacteria in studied lakes depends on the level of mineralization of lake and presence of invertebrates with pasture type of feeding.

L.N. Voloshko, A.V. Pinevich, J. Kopecky, N.N. Titova, P. Hrouzek & P. Zelik

WATER BLOOMS AND TOXINS PRODUCED BY CYANOBACTERIA IN THE LOWER SUZDALSKOE LAKE (SAINT-PETERSBURG, RUSSIA)

The analysis of freeze-dried phytoplankton biomass extracts collected during the water bloom in the Lower Suzdalskoe Lake (St. Petersburg) was performed using a high efficiency liquid chromatography method. The analysis revealed the presence of hepatotoxic microcystin LA and LF in the biomass, as well as other biologically active compounds – protease inhibitors microcin SF608 and anabenopeptids A and F. Dangerous phytotoxins were not found in the biomass extract of the plankton dominant Planktothrix agardhii (Gom.) Anagn. et Kom. CALU1306. The presence of microcystins in the biomass is apparently due to the populations of other cyanobacteria (Microcystis (Kutz.) Elenk., Anabaena Bory, etc.). It has been concluded that the water bloom conditions require the effective control of environmental factors that cause eutrophication using chromatographic techniques, immunosorbent assays, and protein phosphatase tests.

E.К. Zolotareva, E.I. Shnyukova, V.V. Podorvanov

MICROALGAE AS HYDROGEN PRODUCERS

The current state of research on photosynthetic hydrogen production by microalgae to create alternative bioenergetics is reviewed. Data on the mechanisms of hydrogen evolution by blue-green and unicellular green microalgae and the enzymes catalyzing these processes are given. The ability to produce hydrogen in different amounts is developed in the process of adaptation of microalgal cultures to stress conditions. Factors stimulating the yield of hydrogen, in particular, the influence of modes of illumination, addition of respiratory substrates, reducing agents, inhibitors of electron transport, as well as the results of molecular H₂ photoproduction by strains from Culture Сollection of algae of the Kholodny Institute of Botany NASU are analyzed. Prospects for the use of microalgae as transformers of solar energy in molecular hydrogen are considered.

№3 (2010)

G.M. Palamar-Mordvintseva, P.M. Tsarenko

BIOGEOGRAPHY OF ALGAE OF UKRAINE, ITS FEATURES, PROBLEMS AND PROSPECTS

The article provides a brief overview of the state of the biogeography of algae of Ukraine. The features of the biogeography of marine and freshwater algae in the region, noted the difficulties of this phycologycal trends in Ukraine, and identified its problems and prospects.

A. Abbas, M. Shameel

ANATOMICAL STUDIES ON A NEW BROWN ALGA, NIZAMUDDINIA ZANARDINII (SCHIFF.) P. SILVA

A newly established fucalean alga, Nizamuddinia zanardinii (Schiff.) P. Silva (= Sargassopsis zanardinii (Schiff.) Nizamuddin et al.) was collected from the coast of Ormara, Balochistan (Pakistan), and investigated in detail for its morphology, anatomy, and reproduction. This is the first study of its internal structure.

А.А. Voytsekhovich, G.P. Kashevarov

PIGMENTS CONTENT OF PHOTOSYNTHETIC APPARATUS OF GREEN ALGAE PHOTOBIONTS OF LICHENS

The analysis of chlorophylls (а and b), b-carotene and xanthophylls content in Asterochloris, Myrmecia, Trebouxia and Trentepohlia genera of green algae photobionts showed heterogeneity of pigments content both on generic and specific level. Pigments content for Trebouxia and Myrmecia is indicated for the first time. Species pigments amount and ratio of Trebouxia genus depended on their belonging to one or another morpho-genetical group. The groups with low («corticola», «gigantea» and «impressa») and high («arboricola» and «simplex» carotenoids content were distinguished, which is probably connected with ecological-physiological characteristics of these representatives, especially with how much they are obligate or facultative as photobionts, with their geographical distribution, etc. The data on pigments content of Asterochloris, Myrmecia and Trentepohlia confirm the same tendency to amount and ratio change of different pigment groups depending on their life strategy, ecology and geographical distribution.

D.A. Nesterova

DORMANT STAGES OF PLANKTNIC ALGAE IN BOTTOM SEDIMENTS OF ODESSA PORT (BLACK SEA, UKRAINE)

The species diversity and spatial distribution of spores, cysts and vegetative cells of planktonic algae grown from bottom sediments of Odessa port have been studied. From five phyla of Bacillariophyta (32), Dinophyta (11), Chlorophyta (10), Cyanophyta (6), and Chrysophyta (4) 63 algal species have been discovered. The most frequent species include the diatom Skeletonema costatum, Nitzschia closterium, Cerataulina pelagica. All algal species grown from sediments were encountered in phytoplankton of the Odessa port except for the diatom Detonula confervaceae and green Dicellula planctonica. Abudant growth of planktonic algae was observed in bottom sediments collected at small depths which decreased with increasing depths. The number of germinated cells were directly related to the intensity of phytoplankton development.

G.M. Zenova, E.O. Omarova, A.I. Kurapova, V.K. Orleanskiy & N.V. Shadrin

THE MODEL ASSOCIATIONS OF CYANOPROKARYOTA AND ACTINOMYCETE

In experimental associations of Cyanoprokaryota and Actinomycetes isolatedfrom natural algal-bacterial mats of hypersaline lakes of Crimea the specific interactions of Oscillatoria terebriformis(Ag.) Elenk. (Cyanoprokaryota)and Streptomyces odorifer (Rullman 1895) Waksman 1953 were revealed. They included: positive tropism of streptomyces hyphae to O. terebriformis; stimulation of photosynthetical activity of O. terebriformis in association with streptomyces comparing to monoculture; changing of antimicrobial properties of association in comparison with monocultures of Streptomyces and Oscillatoria. Functional role of actinomycetes in natural algal-bacterial mats is discussed.

T.A. Chekryzheva, S.F. Komulainen

ALGAL FLORA OF LAKES AND RIVERS IN REPUBLIC OF KARELIA (RUSSIA)

Characteristic features of the taxonomic and eco-geographic structure of phytoplankton and periphyton – most important components of aquatic ecosystems of different types in Karelia, were described relying on the results of long-term research. Most common species and indicator-species that can be used in assessing the levels of mineralization, acidification, organic pollution and eutrophication were identified.

T.V. Nikulina

BIODIVERSITY OF ALGAE OF HOT SPRINGS FROM KURIL ISLANDS (RUSSIA)

The paper presents the results of study of algal biodiversity of hot springs from islands Kunashir, shiashkotan and yankicha (kuril islands, russia). Algal flora includes 163 species (180 subspecific taxa) from 4 divisions: Cyanoprokaryota, Euglenophyta, Bacillariophyta and Chlorophyta.

M. Kulikovskiy, H. Lange-Bertalot, D. Metzeltin

SPECIFIC RANK FOR SEVERAL INFRASPECIFIC TAXA IN THE GENUS PINNULARIA EHRENB.

A new specific status for some taxa belonging to Pinnularia Ehrenb. is proposed, due to taxonomic inconsistencies concerning their current infraspecific rank. The morphological differences from their nominate varieties appear too conspicuous for assuming conspecifity.

K.M. Sytnik

BIOTIC DIVERSITY: INVESTIGATION, CONSERVATION AND ENRICHMENT

The meaning and content of the term "the biotic diversity" that means variability of living organisms are described in the article. The pattern of structural-functional connections between the basic levels of the living nature organization taken from the monograph by M.A. Golubets. The biodiversity of Ukraine is characterized, the role and significance of the Ukraine Red Book is critically estimated. The author scrupulously describes paradigm, object, subject and research methods of new biological science – biodiversitology. A proper attention is devoted to study threats of impoverishment and extinction of separate structures in the biodiversity, actions of protection of rare, relic, valuable for medicine, industry and science, species and landscapes which are generally recognized and conserved because of their historical and cultural value. The author examines tasks of Ukrainian botanists, mycobiologists, zoologists, hydrobiologists in light of International year of biodiversity, proclaimed by United Nations in 2009.

№4 (2010)

N.A. Davidovich, O.I. Davidovich

SEXUAL REPRODUCTION AND MATING SYSTEM OF THE TABULARIA TABULATA (C. AGARDH) SNOEIJS (BACILLARIOPHYTA)
Sexual reproduction and mating system of the diatom Tabularia tabulata were studied in clonal cultures. Cis-type anisogamous sexual reproduction was revealed. Mating system involves homo- and heterothallic modes of reproduction; and both male and female clones are capable to reproduce homothallically. The combination of homo- and heterothallic modes of reproduction gives certain evolutionary advantage; on the one hand, providing homozygous lines, and on the other hand, increasing genetic diversity. Study of sex inheritance in the first generation progeny revealed the nature of sex determination in T. tabulata. Male sex is heterogametic resulting from the presence of two alternative genetic factors, conditionally M and F, while female is homogametic and determined by combination of FF sexual factors.

Zh.V. Markina, N.A. Aizdaicher

DESALINATION INFLUENCE ON THE GROWTH AND CERTAIN BIOCHEMICAL CHARACTERISTICS OF THE CHAETOCEROS SOCIALIS F. RADIANS (F. SCHUTT) PROSCHK.-LAVR. (BACILLARIOPHYTA)

Desalination influence on diatom alga Chaetoceros socialis f. radians (Bacillariophyta) growth, chlorophyll a, carotenoid and DNA contents were studied. It was shown, that the alga was very sensitive and had low adaptation ability to desalination. We consider, that Ch. socialis f. radians haven’t osmoregulation mechanisms.

A.I. Bozhkov, N.G. Menzyanova, K.V. Sedova & A.V. Goltvyanskiy

EFFECT OF HIGH TEMPERATURE ON SENSITIVITY AND RESISTANCE TO THE COPPER IONS  OF  DUNALIELLA VIRIDIS TEOD. (CHLOROPHYTA) CELLS

The protein synthesis activity and protein content, the content of the different types of nucleic acids and lipids in cells of microalgae Dunaliella viridis Teod., copper-sensitive culture (CuS-culture) and copper resistant culture (CuR-culture), were researched. It was found, that formation of cell resistance to high copper concentration was accompanied by the formation different from the control culture epigenotype, which was characterized by: a) decreasing total RNA and ribosomal RNA content; b) decreasing protein synthesis activity and protein content; c) decreasing protein 70 kDa fraction and increasing protein 35 kDa fraction; d) increasing lipid content in cytosol (3-10 times for different lipid fraction). It is shown that cells of CuR-culture D. viridis have increased resistance to short-term effects of high temperature (45°С for 1.5-2.0 min) compared with the of CuS-culture. Increased thermoresistance CuR-cultures of D. viridis correlated not only with decreasing content of ribosomes and protein, but with a high content of copper ions in cells.

I.R. Levenets, V.I. Fadeev

MACROALGAE OF FOULING AND EPIZOON IN SHALLOW WATERS OF SOUTHERN PRIMORYE (SEA OF JAPAN, RUSSIA)

As a result of long-term researches (from 1979 up to 2007) on the seashore near southern Primorye (Sea of Japan) the composition and ecological peculiarities of fouling and epizoon floras have been studied. There were 145 macroalgal species (73 – red algae, 36 – brown and 36 – green), of which nine species were new for benthic flora of study area, occurred in the fouling and on the valves of Japanese scallop. The percentage of algal megataxa among studied floras considerably differed from the typical benthic floras. Brown and green algae are predominant in fouling flora's composition on the constructions non-having direct contact with a bottom. The predominance of the red algae is a characteristic feature of floras having direct contact with a bottom – that of epizoon and piers fouling. The considerable differences of studied floras on thallus forms' proportions deal with hydrodynamic peculiarities of biotopes.

A.A. Begun, L.I. Ryabushko, A.Yu. Zvyagintsev

BACILLARIOPHYTA OF THE PERIPHYTON OF EXPERIMENTAL PLATES OF THE GOLD HORN BAY OF THE SEA OF JAPAN (RUSSIA) IN THE CONDITIONS OF THE ANTHROPOGENIC CONTAMINATION

The composition of species, quantity, biomass, indexes of the Shannon (Н), Pielou (е), coefficient of Chekanovsky-Sorensen (KS) of diatom communities in peryphyton of experimental plates in extremely-eutrophic Gold Horn Bay and in temperately Rynda Bay are studied in a summer-autumn 2000. Ninety-four taxa of diatoms were found with predominance of Bacillariophyceae (60.6%). In Gold Horn 45 taxa were revialed, Rynda Bay – 60; 26 taxa are common for both bays. Eight taxa of diatoms: Amphora caroliniana Giffen, Ardissonea crystallina (C. Agardh) Grunow, Falcula media var. subsalina Proschk.-Lavr., Neosynedra provincialis (Grunow) Williams et Round, Gyrosigma tenuissimum (W. Sm.) Griff. et Henfr., Nitzschia hybrida f. hyaline Proschk.-Lavr., Synedra toxoneides (?strup) Hust. and Pleurosigma clevei Grunow. are reported for Russian waters of the Sea of Japan for the first time. Species-indicators of organic contamination of waters were discovered: Gold Horn Bay prevailed a- and b-mesosaprobionts, Rynda Bay – b-mesosaprobionts. Quantity and biomass of diatoms of Gold Horn Bay in 1,5 times is higher due to planktonic species settling on substrate, as compared to a substrate of Rynda Bay, were benthic and bentho-planktonic diatoms prevailed.

N.I. Karayeva, L.N. Bukhtiyarova

AN ADDITION TO THE BACILLARIOPHYTA FLORA OF THE CASPIAN SEA. I.

Some new and rare for the Caspian Sea taxa of Bacillariophyta are investigated, among them the representatives of the genera Amicula (Witkowski) Witkowski, Astartiella (Hustedt) Witkowski et al. Nomenclature references, illustrations, morphological description, data on distribution in the Caspian Sea and general distribution are provided for each taxon.

B. Zarei-Darki

CYANOPROKARYOTA FROM DIFFERENT WATER BODIES OF IRAN

Materials for the present article are based on investigations carried out during 2000-2009 from 125 water bodies in Iran; 182 species (198 infraspecific taxa) of blue-green algae were revealed. The species richness and taxonomic structure of blue-green algae, which has been found in differentbiotopes, were unequal. One hundred and nineteen species (119) (126 infr. taxa) of phytoplankton, 178 species (194 infr. taxa.) of phytobenthos, and 20 species (21 infr. taxa) of periphyton were recorded.

M.S. Kulikovskiy, S.I. Genkal, T.M. Mikheeva

NEW DATA  FOR  THE  BACILLARIOPHYTAFLORA  OF  BELARUS. 1. FAMILY  NAVICULACEAE KUTZ.

In the phytoplankton of the Svisloch River (Belarus Republic) 113 diatom taxa of species and infraspecific rank new for this river have been revealed. Among them 63 taxa are first cited for Belarus flora. Genera Nupela Vyverman et Compere et Prestauroneis Bruder et Medlin were not recorded in Belarus before. In the paper 7 new taxonomical combinations are suggested. All revealed taxa are known to prefer mesotrophic and eutrophic alkaline water bodies.

E.N. Demchenko

NEW SPECIES OF GENUS THORACOMONAS KORSCHIKOV (PHACOTACEAE, CHLOROPHYTA) FROM TEMPORARY WATER BODY OF KIEV (UKRAINE)

Latin diagnosis, description, drawings and micrographs of new for science species from genus Thorakomonas Korschikov – Th. cruciformis Demchenko sp. nov. which was found from several ephemeral water bodies on the territory of the sity Kiev are presented. The variability of morphological characters of new species and difference it from known species of this genus and related genera as well as significance of some characters in ranges of genera Thoracomonas, Pteromonas Seligo, Dysmorphococcus Takeda are discussed. Several nomenclatural combinations relating to transference of Pteromonas robusta Korschikov and Dysmorphococcus feldmanii (Bourr.) H. Ettl to the genus Thorakomonas as Th. robusta (Korschikov) Demchenko comb. nov. and Th. feldmanii Bourr. are proposed.