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S. I. Genkal - One of the best experts on this subject based on the ideXlab platform.
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Findings of Diatom Algae in the Trunk and Buccal Cavity Content of a Mammoth from Sediments of the Late Pleistocene of Yakutia
Paleontological Journal, 2020Co-Authors: S. I. Genkal, V. A. Gabyshev, A. V. ProtopopovAbstract:The study of the contents of the trunk and buccal cavity of a the remains of mammoth calf ( Mammuthus primigenius ) from Yakutia using scanning electron microscopy has revealed 14 species and varieties of Bacillariophyta and three forms which have been identified only to genus. The obtained data on the diatom species composition expand knowledge of the Pleistocene flora of Bacillariophyta in the region. Ecological characteristics of the detected diatom species indicate that the location where the mammoth was found represented a stagnant or flowing oligotrophic freshwater body with neutral or slightly alkaline pH.
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Diatoms (Bacillariophyta, Fragilariophyceae, and Bacillariophyceae) of Lake Bolshoye Toko (South Yakutia)
Inland Water Biology, 2020Co-Authors: S. I. Genkal, V. A. GabyshevAbstract:A study of phytoplankton in Lake Bolshoe Toko (Yakutia) using scanning electron microscopy has made it possible to obtain the first data on the species composition of Bacillariophyta. A total of 162 species and varieties from 47 genera have been identified, including 96 taxa new for the Aldan River basin, 67 taxa new for Yakutia, and 6 taxa ( Сymbopleura cf. lura, Fragilaria perminuta , Gomphonema parallelistriatum , Pinnularia cf. neomaior var. inflate , Pinnularia cf. stidolphii , and Planothidium cf. distinctum ) new for the flora of Russia. The systematic position and authorship of 22 taxa from 5 genera of Bacillariophyta (Fragilariophyceae and Bacillariophyceae) from reservoirs and watercourses of the Aldan River basin is specified.
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Bacillariophyta in mountainous water bodies of the Barguzin Ridge
Inland Water Biology, 2013Co-Authors: S. I. Genkal, G. I. Popovskaya, E. Yu. Osipov, N. A. Onishchuk, E. V. LikhoshwayAbstract:The species composition of Bacillariophyta in mountain glacial lakes of the Barguzin Ridge (the Cis-Baikal Region) is studied for the first time. More than 200 taxa, including new ones for the flora of Russia (60), are found. The predominance of representatives of the class Pennatophyceae (92%) in the species composition is recorded. The problem of discovering Baikal endemics in high-mountain water bodies is considered.
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Morphology and taxonomy of Navicula cingens (Bacillariophyta)
Novosti sistematiki nizshikh rastenii, 2010Co-Authors: S. I. Genkal, W. G. KharitonovAbstract:When studying the materials from waterbodies in the basin of the ultraoligotrophic lake Elgygytgyn (Chukotka), the species Navicula cingens (Bacillariophyta) earlier known for the Baikal only, has been found. It is proposed to transfer the species into the genus Cavinula. The emended diagnosis of the species is presented.
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Materials on the flora of diatoms (Centrophyceae) from lakes of the Baikal Region and Transbaikalia
Inland Water Biology, 2008Co-Authors: G. I. Popovskaya, S. I. GenkalAbstract:The species composition of Centrophyceae (Bacillariophyta) in the phytoplankton of nine lakes in the Baikal Region and Transbaikalia was studied using electron microscopy (SEM) methods. Nineteen species and varieties of Centrophyceae were recorded; Aulacoseira distans var. septentrionalis and Cyclotella arctica were registered in this region for the first time. Aulacoseira baicalensis , Cyclotella minuta , and Stephanodiscus inconspicuus were also found in the studied lakes and attributed to being endemic to Lake Baikal.
V. A. Gabyshev - One of the best experts on this subject based on the ideXlab platform.
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Findings of Diatom Algae in the Trunk and Buccal Cavity Content of a Mammoth from Sediments of the Late Pleistocene of Yakutia
Paleontological Journal, 2020Co-Authors: S. I. Genkal, V. A. Gabyshev, A. V. ProtopopovAbstract:The study of the contents of the trunk and buccal cavity of a the remains of mammoth calf ( Mammuthus primigenius ) from Yakutia using scanning electron microscopy has revealed 14 species and varieties of Bacillariophyta and three forms which have been identified only to genus. The obtained data on the diatom species composition expand knowledge of the Pleistocene flora of Bacillariophyta in the region. Ecological characteristics of the detected diatom species indicate that the location where the mammoth was found represented a stagnant or flowing oligotrophic freshwater body with neutral or slightly alkaline pH.
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Diatoms (Bacillariophyta, Fragilariophyceae, and Bacillariophyceae) of Lake Bolshoye Toko (South Yakutia)
Inland Water Biology, 2020Co-Authors: S. I. Genkal, V. A. GabyshevAbstract:A study of phytoplankton in Lake Bolshoe Toko (Yakutia) using scanning electron microscopy has made it possible to obtain the first data on the species composition of Bacillariophyta. A total of 162 species and varieties from 47 genera have been identified, including 96 taxa new for the Aldan River basin, 67 taxa new for Yakutia, and 6 taxa ( Сymbopleura cf. lura, Fragilaria perminuta , Gomphonema parallelistriatum , Pinnularia cf. neomaior var. inflate , Pinnularia cf. stidolphii , and Planothidium cf. distinctum ) new for the flora of Russia. The systematic position and authorship of 22 taxa from 5 genera of Bacillariophyta (Fragilariophyceae and Bacillariophyceae) from reservoirs and watercourses of the Aldan River basin is specified.
John Onwuteaka - One of the best experts on this subject based on the ideXlab platform.
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SPATIAL DISTRIBUTION DYNAMICS OF PHYTOPLANKTON IN THE NON-TIDAL AND TIDAL ZONE OF WOJI CREEK IN NIGER DELTA, NIGERIA.
2014Co-Authors: John OnwuteakaAbstract:Biweekly phytoplankton collection of four months duration from six stations of Woji Creek and Bonny estuary in Rivers State Nigeria was used to study the occurrence pattern along a transition zone between estuarine and freshwater habitats. The presence-absence data showed a rich composition of 150 species of algae distributed in 5 classes of macroalgae namely the Bacillariophyta, Cyanophyta, Chlorophyta, Chrysophyta and the Euglenophyta and 54 genera. The contingency analysis in SAS JMP statistics was used to explore the presence-absence relationship between the tidal and non-tidal stations for each of the macro algae class identified in the dry and wet seasons. Among the five classes, the Bacillariophyta and the Chrysophyta had no significant independence (p 0.10) in occurrence. The results show evidence of a spatial distribution of the phytoplankton is that support an ecocline concept rather than an ecotone despite the differences in salinity between the tidal and non-tidal stations. The study provides a rapid assessment and screening tool of environmental change through a taxonomic diversity of the dominant Bacillariophyta and Cyanophyta and through the identification of the ubiquitous and the non-ubiquitous species from the Bacillariophyta, Cyanophyta, Chlorophyta, and the Euglenophyta.
Alfonso G. Banderas-tarabay - One of the best experts on this subject based on the ideXlab platform.
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Phycoflora of the tropical high-mountain lake El Sol, Central Mexico, and some biogeographical relationships
Hydrobiologia, 1997Co-Authors: Alfonso G. Banderas-tarabayAbstract:Algae collected from an oligotrophic crater lake were identified andcompared with similar regional information. A total of 50 genera and105 infrageneric taxa were identified, mostly Chlorophyta (66%),Cyanophyta (20%) and Bacillariophyta (7 genera: one central and sixpennates). Relatively few Chlorococcales were found in thisoligotrophic lake. The families most frequently found wereOedogoniaceae (18 species), Desmidiaceae (17), Zygnemataceae (13),Oscillatoriaceae (11), and Chaetophoraceae (9). Two genera ofCyanophyta, seven of Chlorophyta and 59 species are first records forMexico.
Jacob John - One of the best experts on this subject based on the ideXlab platform.
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Parlibellus panduriformis sp. nov. (Bacillariophyta) from Shark Bay, Western Australia
Phycologia, 1991Co-Authors: Jacob JohnAbstract:Abstract The valve structure and morphological variation of Parlibellus pandunformis sp. nov. (Bacillariophyta) from a hypersaline lagoon at Shark Bay of the Indian Ocean, west coast of Australia, are described. This diatom has been found living in algal mats associated with stromatolites and sublittoral sediments. The panduriform shape and the structure of the striae and interstriae separate this diatom from the other species of Parlibellus. The ecology of the species and its relationship with other members of this genus are discussed.
