A5053394325- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Environmental DNA in Biodiversity Studies
- Fish Ecology and Management Studies
- Marine Biology and Ecology Research
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- Evolution and Genetic Dynamics
- Plant and animal studies
- Coastal wetland ecosystem dynamics
- Genomics and Phylogenetic Studies
- Evolutionary Game Theory and Cooperation
- Methane Hydrates and Related Phenomena
- Ecology and Vegetation Dynamics Studies
- Marine Bivalve and Aquaculture Studies
- Land Use and Ecosystem Services
- Geology and Paleoclimatology Research
- Wastewater Treatment and Nitrogen Removal
- Micro and Nano Robotics
- Marine Ecology and Invasive Species
- Marine and coastal plant biology
- Soil and Water Nutrient Dynamics
- Nonlinear Dynamics and Pattern Formation
University of Cologne
2016-2025
University of Cape Town
2013
Max Planck Society
1992-2010
Max Planck Institute for Evolutionary Biology
1992-2010
Zoological Institute
2005
Universität Greifswald
1996-2000
Austrian Academy of Sciences
1991-1998
Universität Innsbruck
1996
Monash University
1994
Parliament of Australia
1994
Abstract Land-use intensification is a major driver of biodiversity loss. However, understanding how different components land use drive loss requires the investigation multiple trophic levels across spatial scales. Using data from 150 agricultural grasslands in central Europe, we assess influence local- and landscape-level on more than 4,000 above- belowground taxa, spanning 20 groups. Plot-level land-use intensity strongly negatively associated with aboveground groups, but positively or...
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...
Species diversity promotes the delivery of multiple ecosystem functions (multifunctionality). However, relative functional importance rare and common species in driving biodiversity–multifunctionality relationship remains unknown. We studied between (according to their local abundances across nine different trophic groups), multifunctionality indices derived from 14 on 150 grasslands a land-use intensity (LUI) gradient. The above- below-ground had opposite effects, with above-ground being...
Abstract Biofilms, the complex communities of microbiota that live in association with aquatic interfaces, are considered to be hotspots microbial life many ecosystems. Although importance attached algae and bacteria is widely recognized, role highly abundant biofilm‐dwelling micrograzers (i.e., heterotrophic protists small metazoans) poorly understood. Studies often highlight resistance bacterial biofilms grazing within food web therefore argue have a modulating effects on biofilm...
Functional ecology is a subdiscipline that aims to enable mechanistic understanding of patterns and processes from the organismic ecosystem level. This paper addresses some main aspects process-oriented current knowledge on phagotrophic, i.e. heterotrophic mixotrophic, protists in aquatic food webs. not an exhaustive review; rather, we focus conceptual issues, particular numerical functional response these organisms. We discuss evolution concepts define parameters evaluate predator-prey...
Eukaryotic microbial life at abyssal depths remains “uncharted territory” in eukaryotic microbiology. No phylogenetic surveys have focused on the largest benthic environment this planet, plains. Moreover, knowledge of spatial patterns deep-sea community structure is scanty, and what little known originates primarily from morphology-based studies foraminiferans. Here we report great diversity communities all 3 plains southeastern Atlantic Ocean---the Angola, Cape, Guinea Abyssal Plains---from...
Abstract Rapid growth of the world's human population has increased pressure on landscapes to deliver high levels multiple ecosystem services, including food and fibre production, carbon storage, biodiversity conservation, recreation. However, we currently lack general principles describing how achieve this landscape multifunctionality. We combine theoretical simulations empirical data 14 services measured across 150 grasslands in three German regions. In doing so, investigate circumstances...
Abstract Heterotrophic protists (unicellular eukaryotes) form a major link from bacteria and algae to higher trophic levels in the sunlit ocean. Their role on deep seafloor, however, is only fragmentarily understood, despite their potential key function for global carbon cycling. Using approach of combined DNA metabarcoding cultivation-based surveys 11 deep-sea regions, we show that protist communities, mostly overlooked current foodweb models, are highly specific, locally diverse have...
1. Taxonomic composition and abundance of heterotrophic flagellates (HF) were studied in 55 lakes with different trophy northern Germany using a live‐counting technique. 2. Mean abundances biomasses HF ranged from 169 cells L −1 22 μg mesotrophic to 2439 mL –1 475 hypertrophic lakes, respectively. Highest values generally observed spring, but showed maximum early summer. 3. The taxonomic was not significantly influenced by lake season. major fraction consisted chrysomonads Protista incertae...
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...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 55:65-79 (2009) - DOI: https://doi.org/10.3354/ame01286 Effects of temperature increase on grazing planktonic bacteria by biofilm-dwelling consumers Marcel Kathol, Helge Norf, Hartmut Arndt, Markus Weitere* Department General and Limnology, Zoological Institute, University Cologne, 50931 Germany *Corresponding author....
The choanoflagellates (Choanoflagellatea) comprise a major group of nanoflagellates, which are ubiquitous in the aquatic environment. Recent molecular phylogenies have shown them to be sister Metazoa. However, phylogeny is still far from understood. We present here 29 taxon, multigene that robustly places root choanoflagellates. One original nonloricate families, Codonosigidae polyphyletic assemblage nested within Salpingoecidae. elaborate on revised taxonomy divides Choanoflagellatea into...