Rare Species of Centric Diatom Algae (Bacillariophyta, Centrophyceae) from Ukraine

2019 ◽  
Vol 21 (1) ◽  
pp. 67-74
Author(s):  
O. P. Bilous ◽  
S. I. Genkal ◽  
R. Jahn ◽  
J. Zimmermann
Keyword(s):  
Rare Species ◽  
Centric Diatom ◽  
Diatom Algae

scholarly journals Rare species of centric diatom algae (Bacillariophyta, Centrophyceae) from Ukraine

Algologia ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 77-87
Author(s):  
O.P. Belous ◽  
◽  
S.I. Genkal ◽  
R. Jahn ◽  
J. Zimmermann ◽  
...  
Keyword(s):  
Rare Species ◽  
Centric Diatom ◽  
Diatom Algae

Centric diatom algae (Centrophyceae) in waterbodies and water courses of the middle Irtysh basin

2012 ◽  
Vol 5 (1) ◽  
pp. 1-10 ◽  
Author(s):  
S. I. Genkal ◽  
O. P. Bazhenova ◽  
E. Yu. Mitrofanova
Keyword(s):  
Centric Diatom ◽  
Diatom Algae ◽  
Irtysh Basin ◽  
Water Courses

Centric diatom algae of the Selenga River and its delta branches

2008 ◽  
Vol 1 (2) ◽  
pp. 120-128 ◽  
Author(s):  
S. I. Genkal ◽  
G. I. Popovskaya
Keyword(s):  
Centric Diatom ◽  
Diatom Algae ◽  
Selenga River ◽  
Delta Branches

scholarly journals Centric diatom algae of Lake Imandra (Kola Peninsula, Russia)

Algologia ◽  
2018 ◽  
Vol 28 (1) ◽  
pp. 57-67
Author(s):  
D.B. Denisov ◽  
◽  
S.I. Genkal ◽  
Keyword(s):  
Kola Peninsula ◽  
Centric Diatom ◽  
Diatom Algae ◽  
Lake Imandra

New data to morphology, ecology and distribution of rare species Chamaepinnularia circumborealis and Neidiopsis wulffii (Bacillariophyta)

2016 ◽  
Vol 50 ◽  
pp. 34-42 ◽  
Author(s):  
S. I. Genkal ◽  
M. I. Yarushina
Keyword(s):  
Rare Species ◽  
Western Siberia ◽  
Central Area ◽  
Yamal Peninsula ◽  
Published Data ◽  
Similar Species ◽  
Diatom Algae ◽  
Sem Study ◽  
Water Courses ◽  
The Yamal Peninsula

Two rare species of diatom algae, Chamaepinnularia circumborealis and Neidiopsis wulffii, are recorded in water courses and waterbodies in the Yamal Peninsula (Western Siberia, 69°16′2.8″–70°33′53.6″ N, 68°04′10.3″–68°9′57.46″ E). New data on their ecology and distribution are provided. A SEM study of these species has shown their broader variability in diagnostic characters (valve length and width, number of striae in 10 μm, shape of valve, raphe and central area, structure of striae) in comparison with published data. Descriptions of Chamaepinnularia circumborealis and Neidiopsis wulffii are refined. Their differentiation from morphologically similar species is discussed.

scholarly journals Morphology, taxonomy and distribution of the rare species Aulacoseira cataractarum (Hustedt) Simonsen (Bacillariophyta) in Russia

Algologia ◽  
2021 ◽  
Vol 31 (1) ◽  
pp. 3-8
Author(s):  
S.I. Genkal ◽  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Published Data ◽  
Centric Diatom ◽  
Diatom Algae ◽  
Microscope Images ◽  
Volcanic Caldera ◽  
Scanning Electron

This scanning electron microscopy study was undertaken to reanalyze frustule samples of the centric diatom algae Aulacoseira cataractarum, collected earlier from a swamp in the Uzon volcanic caldera (Kamchatka). This species, under the name of Melosira cataractarum, was reported before from a number of waterbodies in Russia. Later it was transferred to the genus Aulacoseira Thwaites – A. cataractarum (Hustedt) Simonsen (Simonsen, 1979), and then – to the genus Pseudostaurosira (A.Grunow) D.M.Williams & F.E.Round, under the name of P. seudostaurosira cataractarum (Hustedt) Wetzel, Morales et Ector. In this study we specify perforation of intercalary bands, the shape of the valves and spines as well as the number of valve face and mantle areolae per stria and their shape. Based on the original and published data an extended diagnosis of P. cataractarum is presented. Scanning electron microscope images of frustules of the centric diatom algae.

scholarly journals About a new representative of the genus Aulacoseira Thw. (Bacillariophyta) for the flora of Ukraine

Algologia ◽  
2021 ◽  
Vol 31 (2) ◽  
pp. 163-169
Author(s):  
S.I. Genkal ◽  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Morphological Characteristics ◽  
Diameter Ratio ◽  
Published Data ◽  
Centric Diatom ◽  
Diatom Algae ◽  
A New Species ◽  
Microscopy Images ◽  
Scanning Electron

In this study, scanning electron microscopy images of valves of the centric diatom algae Aulacoseira subborealis (Nygaard) Denys, Muylaert et Krammer from from the Kaniv Reservoir and the Desna River are analyzed. The quantitative (colony size, valve diameter and mantle height, the ratio of mantle height to valve diameter, number of areola rows and areolae in 10 µm on the mantle, ring-shaped diaphragm size) and qualitative (short pointed spines, areolae arrangement on the valve face and the mantle) morphological characteristics correspond to the diagnosis of A. pusilla (F.Meister) A.Tuji & A.Houki, a new species for the flora of Ukraine. In the analyzed material, minimum values of the mantle height and the height/diameter ratio are lower than in the published data.

On morphological variability of some widespread and rare species of the genus Navicula (Bacillariophyta)

2014 ◽  
Vol 48 ◽  
pp. 38-49 ◽  
Author(s):  
S. I. Genkal
Keyword(s):  
Rare Species ◽  
Morphological Variability ◽  
Natural Populations ◽  
Diatom Algae ◽  
Significant Variability

It is shown that natural populations of diatom algae of the genus Navicula (N. cryptocephala, N. exilis, N. hanseatica, N. margalithii, N. menisculus, N. meniscus, N. radiosa, N. reinhardtii, N. rhynchocephala) manifest significant variability of the main morphological quantitative features: length and width of the valve, number of the striae and lineols in 10 μm, that should be considered during systematic, taxonomic, floristic, and hydrobiological studies.

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