Nataliya Rybalka

Nataliya Rybalka
Georg-August-Universität Göttingen | GAUG · Department of Experimental Phycology and Culture Collection of Algae

Dr. rer. nat.

About

36
Publications
12,315
Reads
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457
Citations
Citations since 2016
12 Research Items
378 Citations
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2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Education
September 2002 - June 2004
National Taras Shevchenko University of Kyiv
Field of study
  • MSc with honours in biology, botany (main subjects – phycology, mycology)
September 1998 - June 2002
National Taras Shevchenko University of Kyiv
Field of study
  • BSc with honours in biology

Publications

Publications (36)
Article
Significance Organisms adjust their lipid compositions to environmental conditions like temperature. Some adaptations involve changes in ratios between unique lipids, which can still be determined after millions of years. Analyzing such lipid ratios in ancient sediments can be used for climate reconstruction. One example is the Long chain Diol Inde...
Article
Vaucheria species have previously been restricted to upper shore habitats in the Wadden Sea (eastern North Sea, European Atlantic). In contrast to these previous observations, we have now found Vaucheria longicaulis and a distinct plastid lineage of V. velutina spreading along the lower shores, forming extensive turfs at and below low tide level un...
Article
Full-text available
In the wake of biological globalization, translocated species of high bio-engineering capacity increasingly change bottom topography of sedimentary coasts. A Vaucheriataxon (Xanthophyceae) of unknown origin is spreading at the transition between intertidal and subtidal zones, while resident Vaucheria-species are confined to the upper shore in the W...
Article
The species composition of algae from biological soil crusts (biocrusts) on the surface of sand dunes (Black Sea coast, Primorske, Izmail District, Odesa Region, Ukraine) was investigated. Samples were collected from three coastal localities: Katranivska Spit, Zhebryianska Bay and Zhebryianska Ridge. The latter two localities are in the territory o...
Article
Xanthophyceae (Stramenopiles) are common microalgae in soil habitats, but not commonly known from maritime sandy habitats. Here we studied the genetic diversity of nine new isolates of Xanthophyceae from coastal habitats using two chloroplast-encoded markers. The isolates exhibited only three morphotypes. The sequence comparisons uncovered a respec...
Article
Full-text available
Natural history collections are leading successful large-scale projects of specimen digitization (images, metadata, DNA barcodes), transforming taxonomy into a big data science. Yet, little effort has been directed towards safeguarding and subsequently mobilizing the considerable amount of original data generated during the process of naming 15-20,...
Conference Paper
Full-text available
The island of Schiermonnikoog harbors a number of freshwater and terrestrial Xanthophycean algae. During 3 field trips in 2018 and 2019 about 50 samples from fresh water, salt water affected, and soil habitats were collected for characterization of genetic diversity of Xanthophycean algae on the island. Xanthophycean algae are delicate organisms, w...
Article
Full-text available
The ability to rapidly generate and share molecular, visual, and acoustic data, and to compare them with existing information, and thereby to detect and name biological entities is fundamentally changing our understanding of evolutionary relationships among organisms and is also impacting taxonomy. Harnessing taxonomic data for rapid, automated spe...
Article
There is an increasing interest in the Eustigmatophyceae, a class of stramenopile microalgae, because they offer a variety of high-value health-beneficial compounds, e.g. polyunsaturated fatty acids (PUFAs), while concomitantly producing high biomass. Clarification of the taxonomy of these organisms at the species level is important in order to ach...
Article
Full-text available
Tocopherols (vitamin E) are only synthesized by photosynthetic organisms and have wide applications in cosmetics and as dietary supplements in human nutrition and aquaculture. Tocopherols from microalgae and cyanobacteria are rarely investigated, and little is known about their contents. Therefore, 130 strains of cultured microalgae and cyanobacter...
Chapter
Filamentous cyanobacteria are the key organisms in biological soil crust formation in all biomes of the world. However, especially in temperate, arctic, and high alpine regions, as well as in few dry Savannah ecosystems, filamentous green algae may act in a similar role. Here, we give an overview on the role, diversity, and biogeography of cyanobac...
Chapter
The Xanthophyceae, Eustigmatophyceae, and Raphidophyceae are three independent classes of stramenopile algae (Heterokontophyta or Ochrophyta); they are not closer related with each other. Most Xanthophytes are unicellular or colonial coccoid algae, others from multicellular filaments and or exhibit thalli composed of multinucleate siphons. The Eust...
Article
A prerequisite for the growth of microalgae on an industrial scale is the optimization of cultivation conditions and the reduction of production costs. The nutrient elements, heat and carbon dioxide provided by flue gas can be used to increase biomass production. The aim of this study was to investigate the effects of different CO2 concentrations o...
Conference Paper
Antarctic soils are ideal places to study particular features of soil microalgae and cyanobacteria left unexplored so far. These include inferring pioneer species at the colonization of young soils poor in nutrients and the development of soil microalgal communities almost without anthropogenic influence and that of vascular plant cover under harsh...
Article
Full-text available
Microalgae and cyanobacteria represent a valuable natural resource for the generation of a large variety of chemical substances that are of interest for medical research, can be used as additives in cosmetics and food production, or as an energy source in biogas plants. The variety of potential agents and the use of microalgae and cyanobacteria bio...
Article
Full-text available
Background Heterococcus is a microalgal genus of Xanthophyceae (Stramenopiles) that is common and widespread in soils, especially from cold regions. Species are characterized by extensively branched filaments produced when grown on agarized culture medium. Despite the large number of species described exclusively using light microscopic morphology,...
Data
DNA sequence differences among five authentic strains of Heterococcus group A. Distance matrices with number of sequence position differences from the rbcL gene, the psbA/rbcL spacer and ITS2 between the five authentic strains of Heterococcus group A (assigned to H. viridis , see text). In brackets, the total number of differences found with a cert...
Data
Maximum likelihood (ML) phylogeny of rbcL gene sequences for Heterococcusand other members of Xanthophyceae. The phylogeny was calculated with the programme GARLI v0.96 [25,26] based on a rbcL data set (1325 bp long, 517/418 variable/parsimony informative sites) consisting of 15 Heterococcus and 32 other Xanthophyceae sequences (corresponding to cl...
Data
Groups of Heterococcus strains with fully identical rbcL and/or psbA/rbcL spacer sequences. Strains marked in bold were used for the rbcL phylogeny (Figure 3, Additional file 1). Species assignment is according to the new species designation as in Figure 2 (see Discussion).
Data
ITS2 sequence and secondary structure phylogenetic analyses of three strains of Heterococcus group D (H. leptosiroides). (A) ProfDistS [27] sequence-structure NJ tree (unrooted) as derived from the multiple sequence-structure alignment of ITS2 helices I-IV recovered for strains of group D, H. leptosiroides. Bootstrap values based on 100 pseudo-repl...
Data
DNA sequences newly determined for 29 Heterococcus strains and their GenBank sequence accession numbers. For the psbA/rbcL spacer and full rbcL gene all determined sequences are listed, for ITS2 only those sequences that were different from each other. (p), only psbA/rbcL spacer and partial full rbcL gene could be determined; (a), already made avai...
Data
Full-text available
ITS2 sequence and secondary structure phylogenetic analyses of twelve strains of Heterococcus groups A-C (H. viridis, H. conicus, H. virginis). (A) ProfDistS [27] sequence-structure NJ tree (unrooted) as derived from the multiple sequence-structure alignment of ITS2 helices I-IV recovered for strains of the H. viridis clade, i.e. groups A-C, H. vir...
Data
Full-text available
ITS2 sequence and secondary structure phylogenetic analyses of Heterococcus fuornensis strain SAG 835–5. (A) ProfDistS [27] sequence-structure NJ tree (unrooted) of ITS2 variants recovered from strain H. fuornensis SAG 835–5 as derived from the multiple sequence-structure alignment of ITS2 helices I-IV. Bootstrap values based on 100 pseudo-replicat...
Chapter
Green algae are a monophyletic lineage of Archaeplastida, a supergroup of photosynthetic eukaryotes exclusively originated from primary endosymbiosis. The green algae are divided into two clades, the Chlorophyta and Streptophyta. The Chlorophyta comprises the vast majority of green algae, with three major lineages (Trebouxiophyceae, Ulvophyceae, an...
Article
A Nostoc-like cyanobacterium, strain SAG 2306, was isolated from a clay soil sample at Assiut region (Egypt). Morphology and analysis of 16S rDNA identified it as a member of the heterocyteous cyanobacteria (Nostocales). Unexpectedly, chlorophyll a and dry weight were higher in manganese deprived (Mn-) or in manganese double deprived (Mn--) than in...
Article
The genetic diversity of all available culture strains of the Tribonemataceae (Stramenopiles, Xanthophyceae) from Antarctica was assessed using the chloroplast-encoded psbA /rbcL spacer region sequences, a highly variable molecular marker, to test for endemism when compared with their closest temperate relatives. There was no species endemic for An...

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Projects

Projects (2)
Project
Diversity, distribution and ecology of green, xanthophycean and eustigmatophycean soil algae as well as their biotechnological applications.
Project
The project is divided into two tasks closely interlinked with each other, (1) a clarification of the taxonomy of the group with newly defined genera and species and (2) further investigation of habitat preferences, speciation processes as well as recovering and naming of new species and lineages of xanthophytes. A broad range of culture strains available from culture collections and own new isolates will be examined to build up a database of reference sequences. With a high-throughput meta-barcoding approach the diversity and distribution patterns across various habitats and geographical regions of Xanthophyceae will be studied on a broader scale.