A5075985975- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Genomics and Phylogenetic Studies
- Marine and coastal ecosystems
- Environmental DNA in Biodiversity Studies
- Coastal wetland ecosystem dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Environmental Science and Technology
- Gut microbiota and health
- Ecology, Conservation, and Geographical Studies
- Cell Image Analysis Techniques
- Diatoms and Algae Research
- Algal biology and biofuel production
- Wastewater Treatment and Nitrogen Removal
- Ecology and Vegetation Dynamics Studies
- Methane Hydrates and Related Phenomena
- Photosynthetic Processes and Mechanisms
- Parasitic Infections and Diagnostics
- Evolution and Genetic Dynamics
- Biocrusts and Microbial Ecology
- Freshwater macroinvertebrate diversity and ecology
- Polar Research and Ecology
- Mercury impact and mitigation studies
- Regional Economic and Spatial Analysis
- Mycorrhizal Fungi and Plant Interactions
University of Duisburg-Essen
2016-2025
Austrian Academy of Sciences
2001-2011
University of Cologne
2000-2004
Zoological Institute
2004
With the delivery of millions sequence reads in a single experiment, next-generation sequencing (NGS) is currently revolutionizing surveys microorganism diversity. In particular, when applied to Eukaryotes, we are still lacking rigorous comparison morphological and NGS-based diversity estimates. this report, studied seasonal community turnover alveolates (Ciliophora Dinophyceae) an oligotrophic freshwater lake by SSU amplicon with NGS as well classical analysis. We complemented analysis...
ABSTRACT We describe the first freshwater members of class Actinobacteria that have been isolated. Nine ultramicro-size (<0.1 μm 3 ) strains were isolated from five habitats in Europe and Asia. These represent a broad spectrum ecosystems, ranging deep oligotrophic lakes to shallow hypertrophic lakes. Even when grown very rich media, cell size was <0.1 indistinguishable sizes bacteria belonging smaller classes natural lake bacterioplankton. Hybridization isolates with oligonucleotide...
ABSTRACT We studied the role of bacterial secondary metabolites in context grazing protection against protozoans. A model system was used to examine impact violacein-producing bacteria on feeding rates, growth, and survival three common bacterivorous nanoflagellates. Freshwater isolates Janthinobacterium lividum Chromobacterium violaceum produced purple pigment violacein exhibited acute toxicity nanoflagellates tested. High-resolution video microscopy revealed that these were ingested by...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 53:83-98 (2008) - DOI: https://doi.org/10.3354/ame01229 Special: 'Progress and Perspectives in Ecology: Highlights of SAME 10, Faro, Portugal, September 2007' Selective feeding behaviour key free-living protists: avenues for continued study David J. S. Montagnes1,*, Ana B. Barbosa2, Jens Boenigk3, Keith Davidson4, Klaus...
With the advent of molecular methods, it became clear that microbial biodiversity had been vastly underestimated. Since then, species abundance patterns were determined for several environments, but temporal changes in composition not studied to same level resolution. Using massively parallel sequencing on 454 GS FLX platform we identified a highly dynamic turnover seasonal protists Austrian lake Fuschlsee. We show closely match their biogeographic distribution. The stable predominance few...
Protists are perhaps the most lineage-rich of microbial lifeforms, but remain largely unknown. High-throughput sequencing technologies provide opportunities to screen whole habitats in depth and enable detailed comparisons different measure, compare map protistan diversity. Such often limited by low sample numbers within single studies a lack standardisation between studies. Here, we analysed 232 samples from 10 sampling campaigns using standardised PCR protocol bioinformatics pipeline. We...
Summary We isolated 28 strains of ‘ Spumella ‐like’ flagellates from different freshwater and soil habitats in Austria, People's Republic China, Nepal, New Zealand, Uganda, Kenya, Tanzania Hawaii by use a modified filtration–acclimatization method. were found all the samples often among dominant bacterivorous respective environments. The small subunit ribosomal RNA (SSU rRNA) gene sequence isolates was determined aligned with previously published sequences members belonging to Chrysophyceae...
Here we introduce a method for quantitative analysis of planktonic protists and microalgae from preserved field samples combining morphological small-subunit (SSU) rRNA gene sequence analysis. We linked microscopic screening with PCR single cells using Lugol's iodine solution. Cells possessing rigid cell wall were incubated Viscozyme subsequently proteinase K disruption; this was unnecessary fragile cells. The addition sodium thiosulfate to the tube considerably decreased inhibiting effect...
Protists influence ecosystems by modulating microbial population size, diversity, metabolic outputs and gene flow. In this study we used eukaryotic ribosomal amplicon diversity from 218 European freshwater lakes sampled in August 2012 to assess the effect of mountain ranges as biogeographic barriers on spatial patterns community structure freshwaters. The communities reflected clusters suggested that inventory was well-sampled at local scale. Our pan-European analysis indicated biodiversity...
Abstract Small bacterivorous eukaryotes play a cardinal role in aquatic food webs and their taxonomic classification is currently hot topic microbial ecology. Despite increasing interest diversity, core questions regarding predator–prey specificity remain largely unanswered, e.g., which heterotrophic nanoflagellates (HNFs) are the main bacterivores freshwaters prokaryotes support growth of small HNFs. To answer these questions, we fed natural communities HNFs from Římov reservoir (Czech...
Among metal pollutants silver ions are one of the most toxic forms, and have thus been assigned to highest toxicity class. Its a wide range microorganisms combined with its low humans lead development wealth silver-based products in many bactericidal applications accounting more than 1000 nano-technology-based consumer products. Accordingly, is widely distributed environment originating from different forms application as metal, salt nanoparticle. A realistic assessment nanoparticle natural...
Abstract Colourless, nonscaled chrysophytes comprise morphologically similar or even indistinguishable flagellates which are important bacterivors in water and soil crucial for ecosystem functioning. However, phylogenetic analyses indicate a multiple origin of such colourless, flagellate lineages. These often referred to as “ Spumella ‐like flagellates” ecological biogeographic studies. Although this denomination reflects an assumed polyphyly, it obscures the taxonomic diversity group and,...
Summary Factors shaping community patterns of microorganisms are controversially discussed. Physical and chemical factors certainly limit the survival individual taxa maintenance diversity. In recent years, a contribution geographic distance dispersal barriers to distribution protists bacteria has been demonstrated. Organismic interactions such as competition, predation mutualism further modify structure distinct taxa. Here, we address relative importance these different in bacterial...
ABSTRACT. High resolution video‐microscopy was used to observe grazing patterns of the heterotrophic nanoflagellates Cafeteria roenbergensis, Bodo sultans, Spumella sp., and Ochromonas sp. enclose food particles with pseudopodia while engulf by invagination cell surface. The following parameters feeding process were quantified: frequency flagellar beating, speed in different positions current, size selection, rate, time budget for handling particles. mean times differed between 94 s 4...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 27:137-148 (2002) - doi:10.3354/ame027137 Role of bacterial phenotypic traits in selective feeding heterotrophic nanoflagellate Spumella sp. Carsten Matz1,*, Jens Boenigk2,**, Hartmut Arndt2, Klaus Jürgens1 1Department Physiological Ecology, Max Planck Institute for Limnology, PO Box 165, 24302 Plön, Germany 2Department...
ABSTRACT Ultramicrobacteria (cell volume < 0.1 μm 3 ) are the numerically dominant organisms in plankton of marine and freshwater habitats. Flagellates other protists assumed to be most important predators these ultramicrobacteria as well larger planktonic bacteria. However, due controversial observations conducted previously, it is not clear whether fractions resistant flagellate predation. Furthermore, known if closely related bacteria vary significantly their sensitivity We...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 71:179-191 (2013) - DOI: https://doi.org/10.3354/ame01662 Influence of nutrients and light on autotrophic, mixotrophic heterotrophic freshwater chrysophytes Julia Rottberger1,*, Ansgar Gruber1, Jens Boenigk2, Peter G. Kroth1 1Plant Ecophysiology, Department Biology, Universität Konstanz, 78457 Germany 2Department Botany,...
Abstract Chrysophyceae are a diverse group of planktonic protists widely distributed in freshwater. They encompass variety orders, whereby heterotrophy has evolved independently several phylogenetic lineages. Therefore, closely related taxa that developed different feeding strategies (photo-, mixo-, heterotrophy). In high-throughput sequencing studies, the were usually addressed as rather than split individual orders. Also because close relationship distinct nutritional strategies, no...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 22:243-249 (2000) - doi:10.3354/ame022243 Comparative studies on feeding behavior of two heterotrophic nanoflagellates: filter-feeding choanoflagellate Monosiga ovata and raptorial-feeding kinetoplastid Rhynchomonas nasuta Jens Boenigk*, Hartmut Arndt Department General Limnology, Zoological Institute, University...