Centrohelid heliozoans of Ukraine with a description of a new genus and species (Haptista: Centroplasthelida)

Zagumyonnyi, Dmitry G.; Radaykina, Liudmila V.; Keeling, Patrick J.; Tikhonenkov, Denis V.

doi:10.1016/j.ejop.2022.125916

Cited by 7 publications

(2 citation statements)

References 59 publications

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“…However, during the summer, bacterivorous protists displayed greater taxonomic diversity, including "rare taxa" representing colpodellids, stramenopiles, heliozoans, and choanoflagellates. This discovery of rare taxa underscores their importance for the summer microbial community and strongly suggests their seasonality (Schiwitza et al, 2020;Zagumyonnyi et al, 2022). Nevertheless, further research is required to investigate their ecological roles in lakes.…”

Section: Less Abundant Taxa Have a Significant Impact On Seasonal Pro...mentioning

confidence: 85%

Seasonal dynamics and drivers of microbial communities in a temperate dimictic lake: insights from metabarcoding and machine learning

Michał,

Anna,

Paweł

et al. 2024

Preprint

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Microbial communities, consisting of prokaryotes and protists, play a central role in ecological processes in aquatic environments. To understand these communities, metabarcoding provides a powerful tool to assess their taxonomic composition and to track spatio-temporal dynamics in both marine and freshwater environments. While previous research has primarily focused on marine ecosystems, it is important to study microbial communities in freshwater environments, which are characterised by high diversity and susceptibility to rapid environmental change. In temperate lakes, despite extensive research on temporal changes in physico-chemical factors and microscopic studies of plankton, there is a notable research gap regarding their eukaryotic microbial communities. Our study fills this gap by investigating the diversity and seasonal changes of prokaryotic and eukaryotic communities in Lake Ros (Poland), a representative temperate lake characterised by two mixing episodes in spring and autumn and pronounced stratification in summer. Our metabarcoding analysis revealed that both the bacterial and protist communities exhibit distinct seasonal patterns that are not necessarily shaped by dominant taxa. To decipher the drivers of the seasonal communities, we used machine learning and statistical methods and identified crucial amplicon sequence variants (ASVs) specific to each season. In addition, we identified a distinct community in the anoxic hypolimnion. We have also shown that the key factors shaping the community composition in Lake Ros are temperature, oxygen and silicon concentration. Understanding these community structures and the underlying factors is crucial in the context of climate change, which might affect mixing patterns and lead to prolonged stratification. Given the pronounced seasonal shifts observed in these communities, we can anticipate that climate change will profoundly impact the functioning of temperate dimictic lakes.

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Section: Less Abundant Taxa Have a Significant Impact On Seasonal Pro...mentioning

confidence: 85%

Seasonal dynamics and drivers of microbial communities in a temperate dimictic lake: insights from metabarcoding and machine learning

Michał,

Anna,

Paweł

et al. 2024

Preprint

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“…They are absent only in naked Oxnerella (Cavalier-Smith & Chao, 2012;Dobell, 1917) and mucous-covered Chlamydaster (Dürrschmidt & Patterson, 1987a). The commonly believed assumption that there are species with only organic spicules as coverings (e.g., Heterophrys and Sphaerastrum) is now challenged by a discovery of scales/spicules alternation in many species (Zagumyonnyi et al, 2021(Zagumyonnyi et al, , 2022Zlatogursky, 2016;Zlatogursky et al, 2018). In light of these discoveries, it is possible that all the Heterophryslike organisms have cryptic scale-bearing stages.…”

Section: The Stalk Of Cernunnos Arctica -A Unique Novel Scale-based S...mentioning

confidence: 99%

Unexpected ubiquity of heart‐shaped scale morphotype in Centroplasthelida (Haptista): Ancestral trait or multiple acquisitions?

Gerasimova,

Mindolina,

Tikhonenkov

et al. 2023

J Eukaryotic Microbiology

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Centrohelids (Haptista: Centroplasthelida) are axopodial protists with a remarkable diversity of external siliceous scale morphologies. It is believed that the last common ancestor of centrohelids had a double layer of siliceous scales composed of plate scales closer to a cell surface and spine scales radiating outwards. The characteristic morphotype of spine scales with a heart‐shaped base was once believed to be a unique feature of the genus Choanocystis, as it was defined by Siemensma and Roijackers (1988). Further research revealed that this morphology is present in different and sometimes distantly related lineages: Ozanamiidae, Meringosphaeridae, and Marophryidae. Here, we report the fourth clade, Pterocystidae, which is also revealed to contain representatives having this phenotype. Cernunnos gen. nov. is erected here to place Cernunnos uralica sp. nov., Cernunnos arctica sp. nov., Cernunnos america sp. nov., and Cernunnos antarctica Tikhonenkov et Mylnikov, 2010, Gerasimova comb. nov. C. uralica was studied with scanning electron microscopy and SSU rDNA sequencing. Molecular phylogenetic analysis placed it into marine environmental clade P within Pterocystida. The ubiquity of spine scales with heart‐shaped bases could be an example of parallel evolution, but taking into account the considerable similarity it is likely an ancestral trait, acquired from the last common ancestor of centrohelids.

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Silica-scaled protists (Chrysophyceae, Centroplasthelida, Thaumatomonadida and Rotosphaerida) in waters bodies of Kotelny Island, Russian Arctic

et al. 2023

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Centrohelid heliozoans of Ukraine with a description of a new genus and species (Haptista: Centroplasthelida)

Cited by 7 publications

References 59 publications

Seasonal dynamics and drivers of microbial communities in a temperate dimictic lake: insights from metabarcoding and machine learning

Seasonal dynamics and drivers of microbial communities in a temperate dimictic lake: insights from metabarcoding and machine learning

Unexpected ubiquity of heart‐shaped scale morphotype in Centroplasthelida (Haptista): Ancestral trait or multiple acquisitions?

Silica-scaled protists (Chrysophyceae, Centroplasthelida, Thaumatomonadida and Rotosphaerida) in waters bodies of Kotelny Island, Russian Arctic

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