Aloisie Poulíčková's research while affiliated with Palacký University Olomouc and other places
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Publications (166)
Poster made for ESEB 2022 Congress held in Prague. It is based on the article Kollár et al. (2022): On the relativity of species, or the probabilistic solution to the species problem. Mol. Eco. 31, 411-418 (DOI: 10.1111/mec.16218).
Drivers of the speciation in bacteria, including geographical isolation and horizontal gene transfer, are still poorly understood. Here, we characterized a new lineage within an anciently diverged thermophilic cyanobacteria. We sequenced the whole genome of a strain Thermostichus vulcanus isolated from the Rupite spring (Bulgaria), which is closely...
Cyanobacteria are crucial primary producers in soil and soil crusts. However, their biodiversity in these habitats remains poorly understood, especially in the tropical and polar regions. We employed whole genome sequencing, morphology, and ecology to describe a novel cyanobacterial genus Argonema isolated from Antarctica. Extreme environments are...
Despite the extensive diversity of bacteria and their importance to the fundamental functioning of terrestrial ecosystems, their distribution patterns are still not fully known. To fill the gap and further understand the biogeographic patterns in bacteria, we investigated the phylogeographic structure and the underlying drivers of diversification a...
For centuries, both scientists and philosophers have discussed the nature of species resulting in ca 35 species concepts proposed to date. However, in our opinion, none of them incorporated neither recent advances in evolutionary genomics nor dimensionality of species in befitting depth. Our attempt to do so resulted in following conclusions. Due t...
Cyanobacteria are photo-oxygenic prokaryotes present in nearly all ecosystems, where they are important in global oxygen, carbon, and nitrogen cycles. They are often recognized as the harbingers of eutrophication in freshwater systems and are increasingly being noted as nuisance species in marine ecosystems such as coral reefs. In recent years, cya...
Many diatom groups are known for widespread (pseudo)cryptic species diversity and Pinnularia gibba group is one of them. Recently, KOLLÁR et al. (2019) delimited species within the group by means of a polyphasic approach, providing an evidence for the existence of fifteen species. In order to further guide the systematic revision of the group, the...
Background and aims – The eutrophic Blackford Pond in Edinburgh has already provided the holotypes of six other Sellaphora species. A further undescribed species is present and requires description and characterization. Methods – Clones of the new species are characterized by light (LM) and scanning electron microscopy (SEM) and molecular phylogene...
This chapter contains sections titled:IntroductionCentric DiatomsPennate Diatom Life Cycles and ReproductionAuxospore Development and StructureInduction of Sexual ReproductionAcknowledgments
This chapter contains sections titled: Introduction Diatom Distribution Diatom Dispersal Ability Functional Classification in Diatom Ecology Spatial Ecology and Metacommunities Aquatic Ecosystems Biomonitoring Conclusions
Diatoms are one of the most abundant and arguably the most species‐rich group of protists. Diatom species delimitation has been often based exclusively on the recognition of morphological discontinuities without investigation of other lines of evidence. Even though DNA sequences and reproductive experiments have revealed several examples of (pseudo...
The Low Temperature Method (LTM) for sample stabilization in environmental scanning electron microscopy (ESEM) is a promising tool for observing diatom assemblages in vivo. Use of ESEM, in comparison to conventional scanning electron microscopy, enables fresh material to be studied without any chemical pretreatment or conductive coating. The newly...
Cyanobacteria are common members of epilithic communities, contributing fixed carbon and nitrogen, providing UV light shielding pigments, helping to retain water, and in general stabilizing particles. Conversely, biofouling by cyanobacteria is of great concern in the U.S. and abroad. The epilithic growth of cyanobacteria on cultural monuments has b...
We investigated type material of Ulva montana (Lightfoot 1777: 973) and compared it with the type material of Gloeocapsa magma Brébisson in Brébisson & Godey (1835: 40) and fresh material from nature. Our investigation indicates a separate evolutionary lineage of U. montana which possesses specific morphological features differing from the most clo...
Some traditional diatom species have long been considered ‘cosmopolitan’, i.e., they are ubiquitous in suitable habitats. However molecular methods have revealed that some of these diatoms are complexes consisting of a few or many species, whose identification by eye with LM is difficult or impossible. This is true of several groups within Pinnular...
Cyanobacteria are amongst the most abundant, ubiquitous, ecologically and evolutionarily significant microbes on Earth. Unique among the Bacteria in their capacity to be identified using morphology, understanding the evolutionary relationships and describing the diversity of this lineage is both important and challenging. The advent of modern seque...
Epiphytic diatoms perform a variety of ecological functions. Diatoms are important primary producers and sources of oxygen which can modify the chemistry of the surrounding aquatic environment. They may live attached to plant surfaces with the help of extracellular polymeric substances and compete with plants for resources (e.g., light, nutrients)....
Cyanolichens are an assemblage of fungi and cyanobacteria from diverse, cosmopolitan habitats. Typically composed of a single species of cyanobacterium, with or without another eukaryotic alga, here we present two novel cyanobionts isolated from an undescribed tripartite lichen. This endolithic lichen was isolated from a granite cemetery tombstone...
Molecular phylogenetic analyses place Ardissonea crystallina (C. Agardh) Grunow and all Toxariids among the bi-and multipolar centric diatoms, almost always recovered as a derived lineage sister to Lampriscus. In all centrics where sexual reproduction has been documented, oogamy, with larger immobile eggs and smaller flagellated sperm has been obse...
Cyanobacteria represent an ancient, monophyletic lineage of bacteria with the ability to undertake oxygenic photosynthesis. Although they possess a relatively high degree of morphological variability compared with other prokaryotes and there is a wealth of molecular data, there are still significant gaps in our knowledge of cyanobacterial diversity...
Leptolyngbya represents a group of common mat forming cyanobacteria with very simple trichome morphology and a polyphyletic evolutionary origin. In this paper, we used a polyphasic approach to describe a new genus morphologically similar to Leptolyngbya. Three strains of Leptolyngbyaceae cyanobacteria were isolated from submersed bark of tree branc...
Cyanobacteria are cosmopolitan group of phototrophic microbes with significant contributions to global primary production. However, their biodiversity, especially in tropical areas, is still largely unexplored. In this paper, we used a combination of molecular and morphological data to characterize a filamentous cyanobacterium isolated from a soil...
The popularity of aquatic bioassessments has increased in Europe and worldwide, with a considerable number of methods being based on benthic diatoms. Recent evidence from molecular data and mating experiments has shown that some traditional diatom morphospecies represent species complexes, containing several to many cryptic species. This case study...
: Two strains of an unusual, filamentous, Geitlerinema-like cyanobacterium inhabiting sandy sediments in Lake Oneida (Jacksonville, Florida) were isolated. These strains possessed a unique combination of specific morphological and molecular characters that enable the establishment of a new monospecific genus on the basis of the type species Jackson...
The cyanobacteria are an ancient lineage of photo-oxygenic bacteria.
Globally responsible for much of the primary productivity and nitrogen fixation,
they are also evolutionarily significant as the photosynthetic members of serial
endosymbiotic events leading to the establishment of chloroplasts. Traditionally
classified based on morphological char...
The response of two strains of Pseudendoclonium basilense Vischer and Stigeoclonium nanum (Dillwyn) Kutzing to ionizing radiation was studied under laboratory conditions. Both strains were isolated as epiphytic from stagnant water bodies under ambient levels of ionizing radiation and cultivated under laboratory conditions on a gradient of tritiated...
Recently published phylogenetic analyses of 52 strains of Navicula cryptocephala -like diatoms confirmed the existence of genetically distinct lineages within N . cryptocephala : clade I “RBG” and clade II “Lubnaig”. Using geometric morphometry, we compared strains of both clades with the lectotype and found that clade I represents N . cryptocephal...
Background and aims – The host-specificity of epiphytic diatom species has long been debated. Scuba divers sampled epiphytic diatoms in the shallow Alpine Lake Valagola (average depth c. 2 m) along seven transects (length: 30–144 m) in West-East direction. The bottom of the tarn was covered by macrophytes dominated by Chara aspera and Potamogeton g...
Small streams and shallow ponds represent sensitive ecosystems and attached diatoms can serve as integrative indicator with fast response to environmental changes. Development of methods for ecological monitoring throughout Europe and their calibration for particular ecoregions are not finished yet and databases need to be filled by data from under...
Benthic algae in small, shallow lakes often represent an important proportion of primary producers, and their competition for nutrients with phytoplankton can allow to maintain clear-water stages, even in the presence of moderate nutrient enrichment. Even in these small and apparently relatively-homogeneous environments, microalgal distribution is...
In a recent paper, Schopf et al. (1) analyzed 1.8-Ga-old fossil sulfur bacteria and found an intriguing morphological similarity between fossil and modern species. Moreover, the authors showed that the deep-water sulfur cycling environment, where these bacteria reside, has not significantly changed throughout time. Thus, the authors hypothesize tha...
Tropical cyanobacteria are an enigmatic group, often overlooked due to undersampling, yet expected to yield tremendous biodiversity. Many recent taxonomical studies have reported the existence of polyphyletic genera complexes in cyanobacteria (cryptogenera), where morphological coherent groups (often hardly distinguishable) have polyphyletic origin...
The cyanobacteria are the most important prokaryotic primary producers on Earth, inhabiting a great diversity of aquatic and terrestrial environments exposed to light. However, the evolutionary forces leading to their divergence and speciation remain largely enigmatic compared to macroorganisms due to their prokaryotic nature, including vast popula...
Diatoms possess a remarkable life cycle in which cell size decreases slowly during vegetative cell division and then increases rapidly via special expanding cells called ‘auxospores’, which are usually formed as a result of biparental sexual reproduction. However, auxospores are sometimes produced by single unpaired cells, i.e. uniparentally. We ex...
A new monospecific genus of an epipelic, filamentous oscillatorean Phormidium–like cyanobacterium is established. The genus was first discovered from a pond at Fiddlers Ridge Drive, Jacksonville, Florida, USA and subsequently isolated into uni–algal strains. During the process of cultivation, a combination of morphological, ultrastructural and mole...
Cyanobacteria are amongst the most important primary producers on the Earth. However, the evolutionary forces driving cyanobacterial species diversity remain largely enigmatic due to both their distinction from macroorganisms, and an undersampling of sequenced genomes. Thus, we present a new genome of a Synechococcus-like cyanobacterium from a nove...
A new genus of a filamentous oscillatorean cyanobacteria was recently named Johansenia, based on morphology, 16S rDNA gene sequence data and 16-23S ITS secondary folding patterns, which differentiated it from the genus Komvophoron (Hašler et al. 2014). The name Johansenia was not used prior to the first version of our manuscript, submitted on 24 Oc...
Epipelic microphototrophs perform a range of ecosystem functions including biostabilization of sediments, regulation of benthic-limnetic nutrient cycling, and primary production. This review summarizes the most recent research of lake/pond phototrophic epipelic taxa and highlights the importance of an approach to identifying these algae that combin...
The genus Synechococcus represents an enigmatic group of cyanobacteria with very simple unicellular morphology and
polyphyletic evolutionary origin. Here, we describe a new genus based on strain of Synechococcus-like cyanobacterium. The
strain was isolated from the peat bog Klin (Slovakia), where it occupies different niches such as hyaline cells o...
The monitoring of currently changing bogs has triggered a need to improve our understanding of correlations between different taxa. We analysed the cross-taxon congruence of six contrasting groups of organisms (vascular plants, bryophytes, fungi, diatoms, desmids and testate amoebae) in permanent plots located in differently polluted summit ombrotr...
The cyanobacterial genus Komvophoron frequently inhabits sediments in stagnant freshwater among which K. hindakii and K. constrictum dominate. However, morphological heterogeneity within populations of K constrictum necessitated a closer examination of this species' taxonomic position. Based on Szafer's (1910) concept, Oscillatoria constricta, late...
It is now clear that whole genome duplications have occurred in all eukaryotic evolutionary lineages, and that the vast majority of flowering plants have experienced polyploidisation in their evolutionary history. However, study of genome size variation in microalgae lags behind that of higher plants and seaweeds. In this study, we have addressed t...
Environmental change alters ecosystem processes, minding biogeochemical cycles. These changes are accompanied by shifts in species composition. We predicted that long‐term averages of environmental variables would explain more of the variability in species composition than short‐term assessments, but that this difference would be weaker for short‐l...
The past few decades have brought about a significant expansion in our understanding of the diatom life cycle, particularly its sexual part. Presented here is a set of proposals for the terminology of processes and structures associated with sexual reproduction and for the resting stages of diatoms, some of which have at times been confused with ea...
The present study focuses on comparison of recent diatom diversity within the unique Central European ombrotrophic wetlands in two regions with contrasting levels of past atmospheric depositions (Jizerské hory Mts. and Jeseníky Mts.). Further, two methods of mire diatom
sampling (squeezing and mineralization of the entire moss sample) are compared...
In contrast to higher plants, diversity and distribution of microalgae is not very well understood and floristic data is incomplete for many regions. This study focuses on filling this gap in case of desmids in the region, Moravia (Czech Republic). During the years 2008-2012, desmid flora of nine Moravian (Czech Republic) peat bogs and wetlands wer...
Filamentous epipelic cyanobacteria were isolated from ponds and lakes in the Czech Republic, Austria and Italy. Morphological and genetic variation of 20 isolated strains within the genera Geitlerinema, Microcoleus and Phormidium were studied. Partial sequences of the 16S rRNA gene were used for phylogenetic analyses, and secondary structure of the...
The baculiform, rod-like morphotypes belong to several phylogenetic lineages within Desmidiaceae (Zygnematophyceae, Viridiplantae). Some, for example the genus Pleurotaenium, form independent lineages, but reductive evolution of complicated desmid cells toward baculiform morphology also occurred in individual lineages, for example Micrasterias. In...
It has long been assumed that cyanobacteria have, as with other free-living microorganisms, a ubiquitous occurrence. Neither the geographical dispersal barriers nor allopatric speciation has been taken into account. We endeavoured to examine the spatial and temporal patterns of global distribution within populations of the cyanobacterium Microcoleu...
Diversity and ecology of desmids (Zygnematophyceae) were studied within eight peat bog sites in the Jeseníky Mts during the years 2006–2009. Altogether, 51 taxa were found in the course of our investigation. A detailed study of spatial distribution of desmids in relation to environmental characteristics was performed. The composition of desmid comm...
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.
Sequences were screened for chimeras by the submitter using Mallard 1.02.