A5015604930- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic Ecosystems and Biodiversity
- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Evolution and Genetic Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Genetic diversity and population structure
- Marine and coastal ecosystems
- Environmental Toxicology and Ecotoxicology
- Microbial Community Ecology and Physiology
- Parasite Biology and Host Interactions
- Environmental DNA in Biodiversity Studies
- Ecology and Vegetation Dynamics Studies
- Species Distribution and Climate Change
- Vibrio bacteria research studies
- Marine Biology and Ecology Research
- Mathematical and Theoretical Epidemiology and Ecology Models
- Water Quality and Pollution Assessment
- Myxozoan Parasites in Aquatic Species
- Plant and animal studies
- Gut microbiota and health
- Marine Bivalve and Aquaculture Studies
- Evolutionary Game Theory and Cooperation
- Isotope Analysis in Ecology
- Biocrusts and Microbial Ecology
Swiss Federal Institute of Aquatic Science and Technology
2016-2025
ETH Zurich
2013-2023
Institute for Biomedical Engineering
2023
City University of New York
2019
Southern California University for Professional Studies
2019
University of Southern California
2019
Université de Montréal
2019
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2019
University of Victoria
2019
Nigerian Institute for Oceanography and Marine Research
2019
Forecasts of ecological dynamics in changing environments are increasingly important, and available for a plethora variables, such as species abundance distribution, community structure ecosystem processes. There is, however, general absence knowledge about how far into the future, or other dimensions (space, temperature, phylogenetic distance), useful forecasts can be made, features systems relate to these distances. The forecast horizon is dimensional distance which made. Five case studies...
We studied the way 12 traits responded to fish kairomones in a set of 16 Daphnia magna clones derived from four different habitats—two where daphnids co‐occur with and two without fish. These differed widely their response predator kairomones, none showing significant all for at least one trait. Most showed traits, no evidence an association between traits. Clones habitats were slightly more responsive presence than fishless locations. conclude that most show induced predators (fish) but...
The overenrichment (eutrophication) of aquatic ecosystems with nutrients leading to algal blooms and anoxic conditions has been a persistent widespread environmental problem. Although there are many studies on the ecological impact elevated phosphorus (P) levels (e.g., decrease in biodiversity water quality), little is known about evolutionary consequences for animal species. We reconstructed genetic architecture Daphnia species complex 2 European lakes using diapausing eggs that were...
We reconstructed cyanobacterial community structure and phylogeny using DNA that was isolated from layers of stratified sediments spanning 200 years lake history in the perialpine lakes Greifensee Lake Zurich (Switzerland). Community analysis based on amplification sequencing a 400-nucleotide (nt)-long 16S rRNA fragment specific to Cyanobacteria revealed operational taxonomic units (OTUs) capturing whole phylum, including representatives newly characterized clade termed Melainabacteria,...
The effects of fish kairomones, crowding chemicals, and day length on the life–history traits a set 16 Daphnia magna clones, derived from four populations that differ in fish‐predation pressure, were studied. Significant among‐population differences observed, being concordance with hypothesis local adaptation. genetic not mediated through change response to but an overall smaller body size, eggs, higher number eggs clones habitats which are present. Using model, we show observed changes...
Estimating scales of dispersal for benthic macroinvertebrates using neutral genetic markers requires consideration genetic, demographic, and historical influences on population structure. We used allozyme electrophoresis to investigate the structure 3 species alpine stream insects among major drainages Swiss Alps (Rhine, Inn, Ticino rivers), streams within each drainage, single streams. Within we examined reaches that were fragmented by lakes or resevoirs unfragmented reaches. Rhithrogena...
The Red Queen coevolutionary hypothesis predicts that parasites drive oscillations in host genotype frequencies due to frequency-dependent selection where common hosts are at disadvantage. However, examples of this phenomenon natural populations scarce. To examine if the theory operates wild, we studied genetic structure crustacean waterflea (Daphnia), relation their infection levels, for which collected multiple samples from a variety lakes. most clone given population was often...
The phylum Cyanobacteria comprises a non-photosynthetic lineage. diversity and distribution of cyanobacteria (NCY) across aquatic environments are currently unknown, including their ecology. Here, we report about composition phylogenetic two clades NCY in ten lakes the European peri-Alpine region, over past ∼100 years. Using 16S rDNA sequences obtained from dated sediment cores, found almost equal proportion taxa assigned to Melainabacteria deepest-branching group Sericytochromatia...
Life history variation and genotype composition were studied in two species of the Daphnia longispina group: relatively large D. galeata (1.4 mm) smaller cucullata (0.9 mm). Several multi—locus genotypes these compared with their interspecific hybrid, X galeata. Both hybrid co—occur shallow eutrophic Tjeukemeer. For successive years, laboratory life table experiments conducted at three temperatures (12.5°, 17.5°, 22.5°C) food levels (carbon concentrations 0.62 1.64 mg/mL) to study mechanisms...
The genetic structure of cyclic parthenogenetic zooplankton populations is strongly determined by the consequences combining sexual and asexual reproduction in same life cycle. Since pioneering population studies on freshwater 1970's, a distinction has been made between permanent intermittent populations. However, results many do not fit expectations this dichotomous model, for example when large lake are considered. In paper, we present unifying framework understanding populations, focusing...
Parasite driven time-lagged negative frequency-dependent selection of hosts has been studied in natural populations by following changes host genotype frequencies over time. However, such dynamics have not considered at higher taxonomic levels, for example, between parental species and their hybrids. In a field study on Daphnia hybrid system, we observed that one taxon first was relatively under-infected, but became over-infected after strong increase frequency. This finding is consistent...
The competitive ability of hybrids, compared with their parental taxa, can cover a wide fitness range from poor to superior. For example communities the Daphnia galeata – hyalina cucullata species complex often show hybrid dominance. We tested whether taxa composition 43 European lakes inhabited by this be explained habitat characteristics (e.g. size descriptors, trophy level) or geography. found that D. occurs more frequently south Alps, whereas and are in north. Lakes dominance had higher...
The dreissenids, quagga mussel Dreissena bugensis and zebra D. polymorpha, are invasive freshwater mussels in Europe North America.These species strongly impact aquatic ecosystems, such as the food web through their high abundance filtration rate.They spread quickly within between waterbodies, have ability to colonize various substrates depths.The invaded established Swiss lakes 1960s, whereas was not detected until 2014.We collected all available data from cantonal well local authorities...
Abstract We present 32 polymorphic microsatellite markers for species of the European Daphnia longispina group: D. galeata , hyalina rosea cucullata and curvirostris . Microsatellite were either isolated from genomic libraries or optimized based on previously published sequence information sister taxa. Cross‐species tests revealed that all but one are applicable to more than species, which allows intra‐ interspecific genetic studies on, i.e. population structure, hybridization events introgression.
Sexual reproduction in Daphnia results the production of diapausing eggs, which are enclosed a structure called ephippium. Ephippia, accumulated by sedimentation, can be preserved for decades and offer opportunity microevolutionary studies as well study former pelagic populations. In Swiss subalpine lake (Greifensee), we studied genetic galeata × hyalina hybrid species complex. We examined sexual females, males, ephippia production. Eggs from were hatched, genotypes taxa composition all...
A toxicokinetic model for Daphnia magna, which simulates the internal concentration of insecticide diazinon, its detoxification product 2-isopropyl-6-methyl-4-pyrimidinol, and active metabolite diazoxon, is presented. During in vivo exposure to diazinon with without inhibition cytochrome P450 by piperonyl butoxide, parent compound as well metabolites were quantified high-performance liquid chromatography–tandem mass spectrometry (LC-MS/MS) extracts D. magna. Rate constants all relevant steps...