Publications by authors named "Mateusz Rybak"

5 Publications

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Marine and brackish D.G.Mann (Bacillariophyta) species from the Java Sea and South China Sea coasts with the description of three new species.

PhytoKeys 2021 22;183:115-142. Epub 2021 Oct 22.

Université de Nantes, EA 2160 Mer - Molécules - Santé 2, Rue de la Houssinière, 44322 Nantes, France.

In this study, samples were collected from the Java Sea coasts, from the South China Sea in Hainan Island coasts and Quảng Yên region and Rú Chá mangrove near Hue in Central Vietnam. In studied samples a total of eight species have been observed. Three of the taxa studied are described herein as species new to science - , and Under light microscopy (LM) and are similar with rhombic-lanceolate to rhombic/ elliptic-lanceolate to elliptic valve shapes and narrowly rounded apices. Both species can be easily distinguished by stria density (higher density in ). Under SEM is characterized by cribrate areola occlusions, a character thus far observed only in three established species. The remaining species of the whole genus known thus far are characterized by hymenate areola. Similar morphology species have been observed from tropical mangrove forests from Madagascar but they all can be easily distinguished based on the lack of grooves in the central area. The third species - has rhombic-elliptic to rhombic-lanceolate valves with broadly rounded to slightly protracted apices in larger specimens. This species has a relatively broad central area. Also unique among brackish-water is the small, rounded stigma positioned almost midway between the valve center and valve margin. In the habitats from which the new species are described we also identified five established taxa including, , , , and . For those species we provide detailed SEM characteristics of valve ultrastructure, as well as the range of environmental conditions and geographic distribution within the study area.
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http://dx.doi.org/10.3897/phytokeys.183.71049DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8556211PMC
October 2021

sp. nov., a cryptic diatom species from the highly alkaline Van Lake (Turkey).

PeerJ 2021 22;9:e12220. Epub 2021 Oct 22.

Institute of Marine and Environmental Sciences, University of Szczecin, Szczecin, Poland.

In this article we describe sp. nov., an example of a diatom species inhabiting extreme habitats. The new species has been isolated and successfully grown from the highly alkaline Van Lake in East Turkey. The description is based on morphology (light and scanning electron microscopy), the sequencing of its organellar genomes and several molecular phylogenies. This species could easily be overlooked because of its extreme similarity to but molecular phylogenies indicate that they are only distantly related. Furthermore, molecular data suggest that may occur in several alkaline lakes of Asia Minor and Siberia, but was previously misidentified as . It also revealed the very close genetic proximity between and the endosymbiont of the dinotom , providing additional clues on what might have been the original species of diatoms to enter symbiosis.
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http://dx.doi.org/10.7717/peerj.12220DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8544256PMC
October 2021

Description of four new terrestrial diatom species from and genera from South Africa.

PhytoKeys 2021 14;182:1-26. Epub 2021 Sep 14.

University of Rzeszów, Department of Agroecology and Forest Utilization, Ćwiklińskiej 1a, 35-601, Rzeszów, Poland University of Rzeszów Rzeszów Poland.

The knowledge about terrestrial diatom assemblages in southern Africa is rather limited, despite a long history of diatom research in this area. Terrestrial habitats are places of characteristic diatom floras, dominated by species resistant to desiccation which are able to thrive in conditions of limited water availability. The presented work expands the knowledge about these unique habitats. During the study on terrestrial moss-inhabiting diatoms from Western Cape Province (South Africa), four taxa with a unique set of valve features have been found and described herein as new species, based on light and scanning electron microscopy. These new species are: M. Rybak, Peszek & Kochman-Kędziora, , M. Rybak, Kochman-Kędziora & Peszek, , Kochman-Kędziora, M. Rybak & Peszek, and Peszek, M. Rybak & Kochman-Kędziora, Algal community composition had low species richness (9-15 taxa per sample) and samples were dominated by: , and Eunotiaaff.pseudominor. The three new species formed numerous populations, exceeding 10% of the share, whereas reached 5.4%. Basic morphological data of associated diatom flora together with detailed micrographs are also provided.
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http://dx.doi.org/10.3897/phytokeys.181.65326DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8455506PMC
September 2021

Three new D.G.Mann (Bacillariophyta) species from Rapa Nui (Easter Island) found in terrestrial diatom assemblages dominated by widely distributed taxa.

PeerJ 2021 5;9:e11142. Epub 2021 Apr 5.

Institute of Marine and Environmental Sciences, University of Szczecin, Szczecin, Poland.

Background: Rapa Nui (Easter Island = Isla de Pasqua) is of volcanic origin, best known for about 900 man-made stone statues known as . It is one of the most isolated inhabited islands on Earth and studies on the diatoms of Rapa Nui are very few.

Methods: Light (LM) and electron microscopic (SEM) observations of a single sample collected from Rapa Nui are presented. The samples (mix of soil and organic detritus) were collected from ground of cave entrance.

Results: The samples were characterized by low diatom diversity and strongly dominated by terrestrial (soil) forms. Among the taxa present in the material studied were cosmopolitan forms of the genera , , , , and . Whereas most of taxa of the enumerated genera were identifiable, only one among four species distinguished in the samples studied was identified. This taxon was . , a cosmopolitan species known previously from South America (Brazil) and Asia (China). The three remaining species could not be assigned to any established species. Therefore, based on external and internal morphological features from light and scanning electron microscopic analysis, we describe here three species new to science, including: . , . and . All three taxa new to science are compared to established species and their significance for the global distribution of the genus is discussed.
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http://dx.doi.org/10.7717/peerj.11142DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8029705PMC
April 2021

A new site for Van de Vijver & Levkov (Bacillariophyta) - the second record from Europe.

Biologia (Bratisl) 2019 13;74(2):149-152. Epub 2018 Dec 13.

2Department of Agroecology, Faculty of Biology and Agriculture, University of Rzeszów, 35-601 Rzeszów, Poland.

This paper presents the first record of Van de Vijver & Levkov, outside of the type locality (second record in the Europe). Authors present habitat characteristic of the species, with LM and SEM micrographs. was found in a small outflow of water from storm sewers in Stalowa Wola (SE Poland). occurred only rarely (0-5 valves per slide), in a small, shallow puddle which was supplied by the water from the outflow. This species was recorded in sediments and on plants submerged in water with a wide range of conductivity (347-22,100 μS cm), chloride content (64.56-6195.0 mg l) and sodium ions (43.04-3789.1 mg l). The cells observed in the examined material were slightly longer and wider than those from type locality.
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http://dx.doi.org/10.2478/s11756-018-0161-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6341038PMC
December 2018
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