Bánk Beszteri

Bánk Beszteri
University of Duisburg-Essen | uni-due · Phycology

PhD

About

187
Publications
25,657
Reads
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4,875
Citations
Introduction
Additional affiliations
July 2010 - March 2019
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Position
  • Senior Researcher
Description
  • Head of Hustedt Diatom Study Centre
May 2009 - June 2010
Oregon State University
Position
  • PostDoc Position
January 2006 - April 2009
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
Position
  • PostDoc Position
Description
  • Bioinformatics

Publications

Publications (187)
Article
Full-text available
Zinc is an essential trace metal for oceanic primary producers with the highest concentrations in polar oceans. However, its role in the biological functioning and adaptive evolution of polar phytoplankton remains enigmatic. Here, we have applied a combination of evolutionary genomics, quantitative proteomics, co-expression analyses and cellular ph...
Article
Full-text available
Viruses are highly diverse biological entities shaping many ecosystems across Earth. However, understanding the infection of individual microbial cells and the related biochemical changes remains limited.
Preprint
Raman microspectroscopy has been thoroughly used to assess growth dynamics and heterogeneity of prokaryotic cells. Yet, little is known about how the chemistry of individual cells changes during infection with lytic viruses, resulting in so-called virocells. Here, we investigate biochemical changes of bacterial and archaeal cells of three different...
Article
Full-text available
Eukaryotic phytoplankton are responsible for at least 20% of annual global carbon fixation. Their diversity and activity are shaped by interactions with prokaryotes as part of complex microbiomes. Although differences in their local species diversity have been estimated, we still have a limited understanding of environmental conditions responsible...
Book
This volume includes papers covering a broad range of topics in diatom and chrysophyte research - including historical analyses of taxa names and name changes - through descriptions of novel taxa; observations of fine details of valve and cell morphology and ultrastructure, in many cases in an ecological and/or biostratigraphic context; to atte...
Poster
Full-text available
In a response to changes in the environment, species can adapt to the conditions by changing their phenotype, physiology and/or behaviour. This can also be expected in diatoms, particularly in planktonic species, because of their short generation times and high sensitivity to environmental changes. Sediments from ancient lakes dating back several m...
Article
Full-text available
The marine waters around the South Shetland Islands are paramount in the primary production of this Antarctic ecosystem. With the increasing effects of climate change and the annual retreat of the ice shelf, the importance of macroalgae and their diatom epiphytes in primary production also increases. The relationships and interactions between these...
Article
Full-text available
The Southern Ocean is one of the most productive ecosystems in the world. It is an area heavily dependent on marine primary production and serving as a feeding ground for numerous seabirds and marine mammals. Therefore, the phytoplankton composition and presence of toxic species are of crucial importance. Fifteen monoclonal strains of Pseudo-nitzsc...
Article
It has been shown that size of planktonic diatoms responds to changes in water chemistry, but little is known about the influence of different types of environmental factors upon benthic diatom size variation. Here we ask whether water chemistry or hydromorphological influences show a stronger effect on benthic diatom morphometry. 10,624 diatom val...
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,...
Article
Der Klimawandel mit Temperaturerhöhung und Ozeanversauerung wird dramatische Auswirkungen auf das planktische Leben im Südpolarmeer haben. Unsere Studien zeigen, dass das Plankton im Südozean bereits im Wandel ist. Während heutzutage größere Diatomeen (Kieselalgen) die wichtigsten Primärproduzenten im Südpolarmeer sind, könnte es in Zukunft zu eine...
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
Full-text available
Some aspects of the life cycle of the Southern Ocean diatom Fragilariopsis kerguelensis have been investigated previously, but many of its details have not been surveyed in nature. We investigated material from a two-year sediment trap time series by high-throughput imaging and image analysis, looking for morphometric signals of life cycle stages....
Article
Full-text available
Fragilariopsiskerguelensis (O’ Meara) Hust. is a ubiquitous diatom of the Southern Ocean. Its thick frustules are the numerically dominant component of the siliceous sediment layer covering large parts of the seafloor beneath. Morphometric variability of frustules of this diatom has been of interest for paleoenvironmental reconstructions. Recently,...
Data
Figure S3. Relationship between valve width and apical length shows a much clearer separation than aspect ratio, and substantially less dependence on apical length.
Data
Table S2. Valve width ranges of the three species when considering (a) only specimens identified in full agreement (unequivocal); (b) specimens identified as belonging to the species considered by the majority of participants (majority); and (c) by any single participant (single vote).
Data
Figure S1. Validation of striae density measurement by SHERPA (on the x‐axis) versus measured manually (on the y‐axis). Black line: y=x. Red line: least squares regression line.
Data
Figure S2. Dependence of identification agreement on apical valve length. The gray line represents the percentage of specimens within a 10 μm broad apical length range which received at least 90% identical taxonomic labels; the black dotted line depicts the absolute number of these cases within the 10 μm size window. The solid black line depicts th...
Data
Figure S4. Eccentricity of the broadest valve position along the apical axis hardly depends on apical length, and is slightly higher (away from 0.5 on the y‐axis) in Fragilariopsis ritscheri than in the other two species.
Data
Table S1. Apical valve length ranges of the three species when considering (a) only specimens identified in full agreement (unequivocal); (b) specimens identified as belonging to the species considered by the majority of participants (majority); and (c) by any single participant (single vote).
Data
Table S3. Striae density ranges of the three species when considering (a) only specimens identified in full agreement (unequivocal); (b) specimens identified as belonging to the species considered by the majority of participants giving an identification for that specimen (majority); and (c) by any single participant (single vote).
Article
Full-text available
Fragilariopsis kerguelensis is one of the most abundant diatoms in the sediments of the Southern Ocean. Its morphometric features have been proposed as proxies, based on links with, for example, iron availability, sea surface temperature and glacial/interglacial conditions. We investigated morphometric changes in F. kerguelensis valves in a well-st...
Article
Full-text available
Semi‐automated methods for microscopic image acquisition, image analysis and taxonomic identification have repeatedly received attention in diatom analysis. Less well studied is the question whether and how such methods might prove useful for clarifying the delimitation of species that are difficult to separate for human taxonomists. To try to answ...
Article
Full-text available
The recently established diatom genus Shionodiscus is characterized as possessing a labiate process on the valve face and strutted processes with long internal and reduced, or no, external extensions. Many Thalassiosira species with these features were transferred to this new genus, as well as some with short internal, strutted process extensions....
Article
Full-text available
Light microscopy analysis of diatom frustules is widely used in basic and applied research, notably taxonomy, morphometrics, water quality monitoring and paleo-environmental studies. Although there is a need for automation in these applications, various developments in image processing and analysis methodology supporting these tasks have not become...
Data
This folder contains analysis data from the study published as Article (Manuscript ID TEJP-2014-0106): TITLE: RNA and DNA based assessment of sea ice protist biodiversity of the central Arctic Ocean. AUTHORS: Anique Stecher, Stefan Neuhaus, Benjamin Lange, Stephan Frickenhaus, Bánk Beszteri, Peter Kroth and Klaus Valentin JOURNAL: The European Jour...
Technical Report
Full-text available
(English abstract below) Kurzfassung Optische Technologien und Verfahren sind sowohl in der limnischen als auch marinen Forschung Deutschlands über alle Bereiche und Skalen etabliert und entwickeln sich rasant weiter. Die Arbeitsgruppe „Aquatische Optische Technologien“ (AOT) will Forschern und Anwendern eine Plattform bieten, die Wissenstransfer...
Article
Full-text available
Sea ice is a large and diverse ecosystem contributing significantly to primary production in ice-covered regions. In the Arctic Ocean, sea ice consists of mixed multi-year ice (MYI), often several metres thick, and thinner first-year ice (FYI). Current global warming is most severe in Arctic regions; as a consequence, summer sea ice cover is decrea...
Article
Full-text available
Ice-binding proteins (IBPs) have been isolated from various sea-ice organisms. Their characterisation points to a crucial role in protecting the organisms in sub-zero environments. However, their in situ abundance and diversity in natural sea-ice microbial communities is largely unknown. In this study, we analysed the expression and phylogenetic di...
Article
Vanhoeffenus antarcticus was described by Heinrich Heiden from a net sample taken from 385 m depth by the Gauss expedition (First German Antarctic Expedition) while frozen in pack ice near the Antarctic continent in the austral summer of 1902–3. Valves of this peculiar diatom have only ever been observed in preparations from this locality and only...
Article
Full-text available
A small diatom with a peculiar shape is often identified as Navicula schmassmannii in samples collected from alpine lakes and the Arctic region. Due to its characteristic outline, it is relatively well-identifiable, but scanning electron microscope (SEM) confirmation is essential for proving species identity. This species likely has a palaeoecologi...
Article
Full-text available
Optische Technologien und Verfahren sind sowohl in der limnischen als auch marinen Forschung Deutschlands über alle Bereiche und Skalen etabliert und entwickeln sich rasant weiter. Die Arbeitsgruppe „Aquatische Optische Technologien“ (AOT) will Forschern und Anwendern eine Plattform bieten, die Wissenstransfer fördert, der nationalen Entwicklergeme...
Article
Full-text available
Fragilariopsis kerguelensis, a dominant diatom species throughout the Antarctic Circumpolar Current, is coined to be one of the main drivers of the biological silicate pump. Here, we study the distribution of this important species and expected consequences of climate change upon it, using correlative species distribution modeling and publicly avai...
Article
Full-text available
Background Light microscopic analysis of diatom frustules is widely used both in basic and applied research, notably taxonomy, morphometrics, water quality monitoring and paleo-environmental studies. In these applications, usually large numbers of frustules need to be identified and/or measured. Although there is a need for automation in these appl...
Article
Full-text available
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, and ecology; this Community Page describes a resource of 700 transcriptomes from marine microbial eukaryotes to help understand their role in the world's oceans.
Data
Background: Light microscopic analysis of diatom frustules is widely used both in basic and applied research, notably taxonomy, morphometrics, water quality monitoring and paleo-environmental studies. In these applications, usually large numbers of frustules need to be identified and / or measured. Although there is a need for automation in these a...
Data
Fragilariopsis kerguelensis, a dominant diatom species throughout the Antarctic Circumpolar Current, is coined to be one of the main drivers of the biological silicate pump. Here, we study the distribution of this important species and expected consequences of climate change upon it, using correlative species distribution modeling and publicly avai...
Article
Full-text available
Advances in next-generation sequencing technologies are providing longer nucleotide sequence reads that contain more information about phylogenetic relationships. We sought to use this information to understand the evolution and ecology of bacterioplankton at our long-term study site in the Western Sargasso Sea. A bioinformatics pipeline called Phy...
Article
Full-text available
Marine dinoflagellates (alveolata) are microalgae of which some cause harmful algal blooms and produce a broad variety of most likely polyketide synthesis derived phycotoxins. Recently, novel polyketide synthesase (PKS) transcripts have been described from the Florida red tide dinoflagellate Karenia brevis (gymnodiniales) which are evolutionarily r...
Data
Presence of KS proteins in A. ostenfeldii and Heterocapsa triquetra. Western blot analysis of protein extracts from A. ostenfeldii AOSH 2 and Heterocapsa triquetra SCCAP strain K-0481 using a polyclonal rabbit anti- K. brevis KS antibody. Note that the size of the labelled polypeptide is consistent with the molecular weight predicted based on the t...
Data
Extended phylogenetic tree of Type I and Type II KS domains from prokaryotic and eukaryotic PKS and FAS. Sixty-eight taxa representing Type I and Type II KS domains were retrieved from NCBI genbank, John et al., 2008 and Lopèz-Legentil et al., 2010 and analyzed by a maximum likelihood approach. Multiple amino acid alignment was performed with the M...
Data
Multiple alignment of Type I and Type II KS domains from prokaryotic and eukaryotic PKS and FAS. Fifty-nine taxa representing Type I and Type II KS domains were in silico translated and aligned using the MUSCLE algoritm included into MEGA 5.0. If no GenBank accession numbers provided information can be get from *John U, Beszteri B, Derelle E, Van d...
Data
Primer collection used to obtain the 5 full length KS transcripts. Method abbreviations: S –Sanger Sequencing; 5′RACE-Rapid amplification of 5′ cDNA ends; 3′RACE-Rapid amplification of 3′ cDNA ends. (DOCX)
Chapter
Brown algae are important organisms both because of their key ecological roles in coastal ecosystems and because of the remarkable biological features that they have acquired during their unusual evolutionary history. The recent sequencing of the complete genome of the filamentous brown alga Ectocarpus has provided unprecedented access to the molec...
Chapter
Full-text available
Brown algae are important organisms both because of their key ecological roles in coastal ecosystems and because of the remarkable biological features that they have acquired during their unusual evolutionary history. The recent sequencing of the complete genome of the filamentous brown alga Ectocarpus has provided unprecedented access to the molec...
Article
Brown algae are important organisms both because of their key ecological roles in coastal ecosystems and because of the remarkable biological features that they have acquired during their unusual evolutionary history. The recent sequencing of the complete genome of the filamentous brown alga Ectocarpus has provided unprecedented access to the molec...
Article
There have been few studies of the bacterial community within the bottom boundary layer (BBL)-the turbulent region of the water column above the benthos-in shallow seas. Typically, the BBL has large amounts of particulate organic matter suspended by turbulence, and it is often the first region of the water column to become hypoxic when oxygen decli...
Data
Scanning electron micrographs of thalassiosiroid diatoms in the type material (Additional file 4) of Cyclotella nana (= Thalassiosira pseudonana): Stephanodiscus hantzschii Grunow (A, B), Stephanodiscus minutulus (Kützing) Cleve & Möller (C, D), Discostella pseudostelligera (Hustedt) Houk & Klee (E-H), Cyclotella striata (Kützing) Grunow in Cleve &...
Data
Scanning electron micrographs showing exterior (A, B) and interior (C, D) views of Thalassiosira pseudonana (marine strain NEPC709) from Alverson et al. [25]. Scale bar = 2 μM.
Data
Full-text available
Strict consensus of eight most parsimonious trees from a phylogenetic analysis of 32 morphological characters for select Thalassiosirales.
Data
Full-text available
The nomenclatural history of Thalassiosira pseudonana.
Data
Full-text available
The identity of Thalassiosira pseudonana.
Data
Full-text available
Hustedt's observations on the type locality of Cyclotella nana (= T. pseudonana).
Data
Full-text available
Pairwise differences among Thalassiosira pseudonana culture strains at four loci.
Article
Full-text available
Publication of the first diatom genome, that of Thalassiosira pseudonana, established it as a model species for experimental and genomic studies of diatoms. Virtually every ensuing study has treated T. pseudonana as a marine diatom, with genomic and experimental data valued for their insights into the ecology and evolution of diatoms in the world's...
Article
Full-text available
Brown algae (Phaeophyceae) are complex photosynthetic organisms with a very different evolutionary history to green plants, to which they are only distantly related. These seaweeds are the dominant species in rocky coastal ecosystems and they exhibit many interesting adaptations to these, often harsh, environments. Brown algae are also one of only...
Article
In gene-centric comparative metagenomics, differences in observed relative gene abundances among samples are often assumed to reflect the biological importance of individual genes in different habitats. Statistical tests and data mining for genes that represent habitat-specific adaptations are frequently based on this measure. We demonstrate that t...
Article
Multiple clonal isolates from a geographic population of Alexandrium tamarense (M. Lebour) Balech from the North Sea exhibited high genotypic and phenotypic variation. Genetic heterogeneity was such that no clonal lineage was repeatedly sampled according to genotypic markers specified by amplified fragment length polymorphism (AFLP) and microsatell...
Article
Full-text available
Diatoms and other chromalveolates are among the dominant phytoplankters in the world's oceans. Endosymbiosis was essential to the success of chromalveolates, and it appears that the ancestral plastid in this group had a red algal origin via an ancient secondary endosymbiosis. However, recent analyses have turned up a handful of nuclear genes in chr...
Article
Genotypic or phenotypic markers for characterization of natural populations of marine microalgae have typically addressed questions regarding differentiation among populations, usually with reference to a single or few clonal isolates. Based upon a large number of contemporaneous isolates from the same geographical population of the toxigenic speci...