A5030851038- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Protist diversity and phylogeny
- Water Quality Monitoring Technologies
- Marine and fisheries research
- Marine Toxins and Detection Methods
- Ecology and Vegetation Dynamics Studies
- Fish Ecology and Management Studies
- Underwater Vehicles and Communication Systems
- Plant and animal studies
- Marine Bivalve and Aquaculture Studies
- Isotope Analysis in Ecology
- Species Distribution and Climate Change
- Modular Robots and Swarm Intelligence
- Marine and coastal plant biology
- Environmental DNA in Biodiversity Studies
- Coastal wetland ecosystem dynamics
- Algal biology and biofuel production
- Agriculture Sustainability and Environmental Impact
- Evolution and Genetic Dynamics
- Water Quality Monitoring and Analysis
- Physiological and biochemical adaptations
- Oceanographic and Atmospheric Processes
Carl von Ossietzky Universität Oldenburg
2014-2024
University of Southern California
2006-2010
GEOMAR Helmholtz Centre for Ocean Research Kiel
2008
University of Cologne
2008
ABSTRACT DNA sequence information has increasingly been used in ecological research on microbial eukaryotes. Sequence-based approaches have included studies of the total diversity selected ecosystems, autecology ecologically relevant species, and identification enumeration species interest for human health. It is still uncommon, however, to delineate protistan based their genetic signatures. The reluctance assign species-level designations sequences part a consequence limited amount...
Climatic warming is a primary driver of change in ecosystems worldwide. Here, we synthesize responses species richness and evenness from 187 experimental studies quantitative meta‐analysis. We asked 1) whether effects on diversity were detectable consistent across terrestrial, freshwater marine ecosystems, 2) if correlated with intensity, duration, unit size temperature manipulations, 3) these interacted ecosystem types. Using multilevel mixed linear models model averaging, also tested the...
Abstract Body size is a decisive functional trait in many organisms, especially for phytoplankton, which span several orders of magnitude cell volume. Therefore, the analysis as driving species’ performance has received wide attention aquatic ecology, amended recent decades by studies documenting changes phytoplankton response to abiotic or biotic factors environment. We performed systematic literature review provide an overarching, partially quantitative synthesis driver and sentinel...
The structure and genetic diversity of marine protistan assemblages were investigated in the upper 500 m water column at a Pacific Ocean time‐series station off coast Southern California. Deoxyribonucleic acid sequence‐based microbial eukaryote was examined January, April, July, October 2001 four depths (5 m, chlorophyll maximum [CM], 150 m). A total 2956 partial 18S ribosomal ribonucleic gene sequences yielded representatives from most major eukaryotic lineages. Notable among taxonomic...
Abstract Mixotrophs combine photosynthesis with phagotrophy to cover their demands in energy and essential nutrients. This gives them a competitive advantage under oligotropihc conditions, where nutrients bacteria concentrations are low. As the for mixotroph depends on light, competition between mixo- heterotrophic bacterivores should be regulated by light. To test this hypothesis, we incubated natural plankton from ultra-oligotrophic Eastern Mediterranean set of mesocosms maintained at 4...
Two ecological frameworks have been used to explain multitrophic interactions, but rarely in combination: (i) stoichiometry (ES), explaining consumption rates response consumers' demand and prey's nutrient content; (ii) metabolic theory of ecology (MTE), proposing that temperature body mass affect rates, growth rates. Here we combined both, ES MTE investigate interactive effects phytoplankton prey stoichiometry, zooplankton consumer on grazing production a microcosm experiment. A simple...
The stimulation and dominance of potentially harmful phytoplankton taxa at a given locale time are determined by local environmental conditions as well transport to or from neighboring regions. present study investigated the occurrence common algal bloom (HAB) within Southern California Bight, using cross-correlation functions determine potential dependencies between HAB factors, links via hydrography currents. A simulation study, in which Lagrangian particles were released, was used assess...
Pronounced atmospheric and oceanic warming along the West Antarctic Peninsula (WAP) has resulted in abundance shifts populations of krill Salpa thompsoni determined by changes timing sea-ice advance, duration cover food availability. Krill salps represent most important macrozooplankton grazers at WAP, but differ profoundly their feeding biology, population dynamics stoichiometry excretion products with potential consequences for relative availability dissolved nitrogen phosphorus....
Metacommunity ecology currently lacks a consistent functional trait perspective across trophic levels. To foster new cross‐taxa experiments and field studies, we present hypotheses on how three dimensions change along gradients of density individuals, resource supply habitat isolation. The movement dimension refers to the ability move navigate in space, tolerance addresses tolerate prevailing environmental conditions interaction aggregates abilities acquire resources competition with other...
A wireless network of buoys, two autonomous robotic boats, and an tethered vertical profiling system were used to characterize phytoplankton dynamics spatiotemporal changes in chemical physical forcing factors a small montane lake (Lake Fulmor, Idyllwild, California). Three deployments each year conducted 2005 2006 examine seasonal the structure assemblage, as well fine‐scale temporal spatial variations. The buoys yielded patterns situ fluorescence temperature, while two‐dimensional,...
Ecosystem functioning is affected by horizontal (within trophic groups) and vertical (across levels) biodiversity. Theory predicts that the effects of biodiversity depend on consumer specialization. In a microcosm experiment, we investigated ciliate diversity specialization algal prey biovolume, evenness composition, biovolume production. The experimental data was complemented process‐based model further analyzing ecological mechanisms behind observed effects. Overall, increasing had no...
Abstract Ecology aims to comprehend species distribution and its interaction with environmental factors, from global local scales. While changes affect marine biodiversity, understanding the drivers at smaller scales remains crucial. Tidal flats can be found on most of world's coastlines are particularly vulnerable anthropogenic disturbances. They important transient ecosystems between terrestrial ecosystems, their biodiversity provides ecosystem services. Owing this unique,...
Abstract Trait variation among heterospecific and conspecific organisms may substantially affect community food web dynamics. While the relevance of competition feeding traits have been widely studied for different consumer species, studies on intraspecific differences are more scarce, partly owing to difficulties in distinguishing clones same species. Here, we investigate how trait affects between freshwater ciliates Euplotes octocarinatus Coleps hirtus a nitrogen‐limited chemostat system....
Abstract Harmful algal blooms (HABs) are globally increasing in number and spatial extent. However, their propagation dynamics along environmental gradients the associated interplay of abiotic factors biotic interactions still poorly understood. In this study, a nutrient gradient was established linear meta‐ecosystem setup five interconnected flasks containing an artificially assembled phytoplankton community. The harmful dinoflagellate Alexandrium catenella introduced into different...
Abstract Krill and salps play a pivotal role in marine food webs ocean biogeochemistry, yet little is known about their stoichiometry, which crucial for our understanding of the consequences key grazer population shifts ecosystem functioning. To assess differences stoichiometric requirements, we compared elemental composition carbon (C), nitrogen (N) phosphorus (P) body tissue gut content Euphausia superba Salpa thompsoni collected along Northern Antarctic Peninsula conducted systematic...