We studied how ecological factors affect species composition and structure of soil algal assemblages in different types of mountain tundra and sparse forests in the Northern Urals. Soil moisture, pH, nitrogen content and amount of solar radiation were determined using Ellenberg indicator values from phytoindicators. Species identification of soil algae was made using light microscopy following algal culture. We identified 74 algal species from five divisions. Most species were Cyanobacteria and Chlorophyta. For each habitat type we identified species with high frequency and fidelity. Algal species diversity was maximal in herbaceous plant communities, minimal in lichen communities, and showed a positive correlation with soil moisture and nitrogen content.

For many years Chrysastrella Chodat has been a cyst genus but recently it has been re-instated and re-defined. Currently, Chrysastrella contains Ochromonas-like flagellates including O. tuberculata Hibberd which was synonymized with the type species, Chrysastrella paradoxa Chodat. A mass development of stomatocysts, which we identified as Ch. paradoxa, was observed in a bog on the territory of “Yugyd va” National Park (the Subpolar Urals, Russia). The morphology of stomatocysts was studied by scanning electron microscopy and compared with previously described similar morphotypes. Stomatocysts #80 Hansen, #1 Wołowski & Płachno and #4 Bai & Chen seem to be identical to Chrysastrella paradoxa stomatocysts and we propose to reduce them to synonymy.

In this study, the cryptomonads of the northern territories of Russia were explored. Four strains were isolated from the different acidic habitats in the Middle Urals and the North of the European part of Russia. Cells of these strains are flattened in the dorsoventral plane, have an asymmetrical outline and are similar in size and shape to Cryptomonas erosa. Phylogenetic relationships inferred using maximum likelihood and Bayesian interference from datasets of nuclear-encoded SSU, LSU, ITS2 rDNA and psbA cpDNA show that the strains form one clade, which was divided into three subclades with high statistical support. One subclade was attributed to Cryptomonas erosa. Two other subclades represent species new to science. Comparison of ITS2 rRNA secondary structures with the compensatory base changes (CBC) approach confirmed the separation between C. erosa and the two new species, C. macilenta sp. nov. and C. parmana sp. nov. Comparison of nuclear V9 SSU and ITS1 rDNA sequences of two new species with metabarcoding data from 218 lakes in Europe showed that C. macilenta and C. parmana have not previously been recorded in Europe.

This study investigates the Mallomonas adamas species complex in a tropical region using electron microscopy and molecular phylogeny. Analysis of four algal cultures from Vietnam, supplemented by data from two cultures from Europe and one from Australia, all belonging to the M. adamas morphotype, revealed two distinct clades in phylogenetic trees based on SSU rDNA + rbcL cpDNA and ITS1–5.8S–ITS2 rDNA sequences. Based on these results, a new species, Mallomonas imperatoria sp. nov. , is described. Mallomonas imperatoria was found in 22 localities across nine provinces in Vietnam and is also known from Malaysia. This species generally prefers acidic water bodies, including those that are humic-stained, with low mineralization. Thus, findings of this taxon are not very frequent, but it cannot be classified as rare in the tropical region.

Сибирский федеральный университет (СФУ) входит в топ-15 вузов России. Ведущие научные школы Красноярска. Лучший в России кампус. Мировые индустриальные партнёры