A5046399317- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Aquatic Ecosystems and Biodiversity
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Isotope Analysis in Ecology
- Environmental Toxicology and Ecotoxicology
- Algal biology and biofuel production
- Aquatic Invertebrate Ecology and Behavior
- Marine Invertebrate Physiology and Ecology
- Marine Bivalve and Aquaculture Studies
- Soil and Water Nutrient Dynamics
- Marine Ecology and Invasive Species
- Marine and fisheries research
- Ecosystem dynamics and resilience
- Aquatic and Environmental Studies
- Environmental Chemistry and Analysis
- Analytical chemistry methods development
- Identification and Quantification in Food
- Marine and environmental studies
- Marine and coastal plant biology
- Hydrology and Watershed Management Studies
- Protist diversity and phylogeny
- Fish biology, ecology, and behavior
Ludwig-Maximilians-Universität München
2015-2024
Institut Universitaire Européen de la Mer
2009-2019
Laboratoire des Sciences de l'Environnement Marin
2011-2019
Urologische Klinik München
2012-2016
European Union Agency for Law Enforcement Cooperation
2009
Max Planck Society
1993-2006
Max Planck Institute for Evolutionary Biology
1992-2006
Institut für Mittelstandsforschung
2006
Kiel University
2004
LMU Klinikum
2000
Abstract A recent meta‐analysis indicates that trophic cascades (indirect effects of predators on plants via herbivores) are weak in marine plankton striking contrast to freshwater ( Shurin et al. 2002 , Ecol. Lett. 5, 785–791). Here we show a community consisting jellyfish, calanoid copepods and algae, jellyfish predation consistently reduced but produced two distinct, opposite responses algal biomass. Calanoid act as switch between alternative along food chains different length with...
1. The life-history patterns of the cladoceran Daphnia hyalina, widely distributed throughout northern temperate lakes, were observed to vary in presence different size-selective predators. 2. These changes apparently initiated by waterborne cues released 3. In a cue predators preferring large adult D. daphnids reproduced at smaller size and used higher percentage resources for reproduction than absence this cue. opposite was when exposed originating from predator small juvenile hyalina. 4....
Abstract In deep temperate lakes, the beginning of growing season is triggered by thermal stratification, which alleviates light limitation planktonic producers in surface layer and prevents heat loss to deeper strata. The sequence subsequent phenological events (phytoplankton spring bloom, grazer peak, clearwater phase) results part from coupled phytoplankton–grazer interactions. Disentangling separate, direct effects correlated climatic drivers (stratification‐dependent underwater climate...
Currently, very few studies address the relationship between diversity and biomass/lipid production in primary producer communities for biofuel production. Basic on growth of microalgal communities, however, provide evidence a positive biomass Recent have also shown that diversity-productivity relationships are related to an increase efficiency light use by diverse communities. Here, we hypothesize there is diversity, use, lipid phytoplankton Microalgae from all major freshwater algal groups...
Positive effects of biodiversity on ecosystem function are described from an increasing number systems, but the underlying mechanisms frequently remain elusive. A truly predictive understanding biodiversity–ecosystem relationships requires a priori identification traits conferring specific (and possibly complementary) functions to individual species. Although planktonic organisms responsible for approximately half world's primary production, few studies have reported relationship between...
There is widespread concern that loss of biodiversity can influence important ecosystem services. A positive relationship between diversity and productivity has been observed in investigations terrestrial aquatic plant communities. However, an increase primary production (carbon assimilation) does not necessarily result higher nutrient uptake by producers. a loose coupling carbon assimilation autotrophs, their biomass carbon‐to‐nutrient ratios (stoichiometry) are flexible. We performed...
Diversity–productivity relationships at the primary producer level have been extensively studied, especially for terrestrial systems. Here, we explore whether diversity of aquatic producers (phytoplankton) has effects on higher trophic levels (zooplankton). We investigated effect phytoplankton an artificial zooplankton community in a laboratory experiment where biomass and elemental composition (carbon‐to‐phosphorus ratio) were kept constant. Phytoplankton increased means both growth rate...
We conducted laboratory experiments with 85 assembled phytoplankton communities composed of species from four predefined functional groups (chlorophytes, diatoms, cyanobacteria, chrysophytes) to distinguish the relative importance diversity group on carbon uptake. separated observed effects uptake into those caused by particularly important traits (selection effect) and positive interactions among (e.g., complementary resource use or facilitation [complementarity effect]). Additionally, we...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 239:251-261 (2002) - doi:10.3354/meps239251 Grazing during early spring in Gulf of Aqaba and northern Red Sea Ulrich Sommer1,*, Ulrike G. Berninger1,2, Ruth Böttger-Schnack3, Astrid Cornils2, Wilhelm Hagen3, Thomas Hansen1, Tariq Al-Najjar4, Anton F. Post5, Sigrid B. Schnack-Schiel2, Herwig Stibor6, Dorothea...
Summary Climate change may impact most strongly on temperate lake plankton communities in spring, when light availability and water temperature rapidly due to thermal stratification. Effects of changing one food‐web component transfer other components, producing a complex interplay between physical drivers biotic feedbacks. Understanding this is important, because altered climate regimes could result phenological mismatch the phytoplankton spring bloom timing maximum food requirements...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 199:43-53 (2000) - doi:10.3354/meps199043 Grazing by mesozooplankton from Kiel Bight, Baltic Sea, on different sized algae and natural seston size fractions F. Sommer1,*, H. Stibor2, U. Sommer3, B. Velimirov1 1Institut für Medizinische Biologie, Universität Wien, Abteilung Allgemeine Mikrobiologie, Währinger...
We attempted to separate the additive variance of life‐history parameters (size at first reproduction (SFR), proportion total production allocated reproduction) Daphnia hyalina in a mesotrophic lake during different seasons into genetic components and phenotypic plasticity. Every month we randomly isolated juveniles 20 clones from measured their immediately after isolation, i.e., under influence all modifying factors lake. The measurements were repeated had been kept laboratory for least six...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 270:199-207 (2004) - doi:10.3354/meps270199 Moderate increase in biomass of omnivorous copepods may ease grazing control planktonic algae Olav Vadstein1,*, Herwig Stibor2, Bettina Lippert2, Kjetil Løseth3, Wendy Roederer2, Line Sundt-Hansen3, Yngvar Olsen3 1Department Biotechnology, and 3Department Biology,...