A5049021919- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Marine Toxins and Detection Methods
- Protist diversity and phylogeny
- Aquatic Ecosystems and Phytoplankton Dynamics
- Environmental DNA in Biodiversity Studies
- Microbial Natural Products and Biosynthesis
- Diatoms and Algae Research
- Physiological and biochemical adaptations
- Ocean Acidification Effects and Responses
- Genomics and Phylogenetic Studies
- Marine Biology and Ecology Research
- Polar Research and Ecology
- Bat Biology and Ecology Studies
- Hemoglobin structure and function
- Scientific Computing and Data Management
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Methane Hydrates and Related Phenomena
- Species Distribution and Climate Change
- Atmospheric and Environmental Gas Dynamics
- Toxic Organic Pollutants Impact
- Marine and fisheries research
- Food Industry and Aquatic Biology
- Plant Surface Properties and Treatments
Helmholtz Institute for Functional Marine Biodiversity
2018-2025
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2016-2025
Carl von Ossietzky Universität Oldenburg
2022-2025
University of Vienna
2022
Some cope better than others Increasingly, research is revealing how organisms may, or may not, adapt to a changing climate. Understanding the limitations placed by species's physiology can help determine whether it has an immediate potential deal with rapid change. Many studies have looked at physiological tolerance climate change in fishes, results indicating range of responses. Dahlke et al. conducted meta-analysis explore life stage influence ability tolerate temperature (see Perspective...
The parasitic marine dinoflagellate Amoebophrya is the first known eukaryote with aerobic mitochondria without a genome.
Abstract With each cell division, phytoplankton create new space for primary colonization by marine bacteria. Although this surface microenvironment is available to all planktonic bacterial colonizers, we show the assembly of consortia on a cosmopolitan diatom be highly specific and reproducible. While phytoplankton–bacteria interactions play fundamental roles in ecosystems, namely production carbon cycle, ecological paradigm behind epiphytic microbiome remains poorly understood. In...
Many dinoflagellate species are notorious for the toxins they produce and ecological human health consequences associated with harmful algal blooms (HABs). Dinoflagellates particularly refractory to genomic analysis due enormous genome size, lack of knowledge about their DNA composition structure, peculiarities gene regulation, such as spliced leader (SL) trans-splicing mRNA transposition mechanisms. Alexandrium ostenfeldii is known macrocyclic imine toxins, described spirolides. We...
Abstract Intraspecific trait diversity can promote the success of a species, as complementarity functional traits within populations may enhance its competitive and facilitates resilience to changing environmental conditions. Here, we experimentally determined variation relationships between in 15 strains toxic dinoflagellate Alexandrium ostenfeldii derived from two populations. Measured included growth rate, cell size, elemental composition, nitrogen uptake kinetics, toxin production...
Abstract Amphibians and fishes play a central role in shaping the structure function of freshwater environments. These organisms have limited capacity to disperse across different habitats thermal buffer offered by systems is small. Understanding determinants patterns their physiological sensitivity life history is, therefore, imperative predicting impacts climate change systems. Based on systematic literature review including 345 experiments with 998 estimates 96 amphibian (Anura/Caudata)...
Dinoflagellates are a major cause of harmful algal blooms (HABs), with consequences for coastal marine ecosystem functioning and services. Alexandrium fundyense (previously tamarense) is one the most abundant widespread toxigenic species in temperate Northern Southern Hemisphere produces paralytic shellfish poisoning toxins as well lytic allelochemical substances. These bioactive compounds may support success A. its ability to form blooms. Here we investigate impact grazing on monoclonal...
The vulnerability of fish embryos and larvae to environmental factors is often attributed a lack adult-like organ systems (gills) thus insufficient homeostatic capacity. However, experimental data supporting this hypothesis are scarce. Here, by using Atlantic cod (Gadus morhua) as model, the relationship between embryo (to projected ocean acidification warming) capacity was explored through parallel analyses stage-specific mortality in vitro activity expression major ion pumps (ATP-Synthase,...
Marine dinoflagellates of the genus Alexandrium are proximal source neurotoxins associated with Paralytic Shellfish Poisoning. The production these toxins, toxin biosynthesis and, thus, cellular toxicity can be influenced by abiotic and biotic factors. There is, however, a lack substantial evidence concerning toxins' ecological function such as grazing defense. Waterborne cues from copepods have been previously found to induce species-specific increase in content minutum. However, it remains...
We studied the effect of ocean acidification (OA) on a coastal North Sea plankton community in long-term mesocosm CO2-enrichment experiment (BIOACID II study). From March to July 2013, 10 mesocosms 19 m length with volume 47.5 55.9 m3 were deployed Gullmar Fjord, Sweden. CO2 concentrations enriched five reach average partial pressures (pCO2) 760 μatm. The remaining used as control at ambient pCO2 380 Our paper is part PLOS collection this experiment. Here, we here tested OA total primary...
Climate change-induced warming is expected to drive phytoplankton poleward as they track suitable thermal conditions. However, successful establishment in new environments requires adaptation multiple abiotic factors beyond temperature alone. As little known about how polar species differ key functional and genetic traits, simple predictions of movement rely on large assumptions performance other relevant dimensions than responses (e.g., light regime, nutrient uptake). To identify...
Abstract Anthropogenic pressures like ocean warming, acidification, rising N : P ratios, and marine heatwaves (MHWs) are affecting eukaryotic plankton diversity, though their combined impacts rarely studied. To address this, we conducted a mesocosm experiment on North Sea community, testing the influence of MHW under ambient future environmental conditions. Using 18S rRNA amplicon sequencing, found that global change generally reduced protist in particular phototrophic organisms. While...
A major cause of phytoplankton mortality is predation by zooplankton. Strategies to avoid grazers have probably played a role in the evolution and impacted bloom dynamics trophic energy transport. Certain species genus Pseudo-nitzschia produce neurotoxin, domoic acid (DA), as response presence copepod grazers, suggesting that DA defense compound. The biosynthesis comprises fusion two precursors, C10 isoprenoid geranyl pyrophosphate L-glutamate. Geranyl (GPP) may derive from mevalonate (MEV)...
We monitored the kinetics of grazer‐induced responses in marine dinoflagellate Alexandrium tamarense . Chemical cues from each three calanoid copepods ( Calanus sp., Centropages typicus, and Acartia tonsa ) induced increased toxicity suppressed chain formation A Both chemical morphological augmented over 3 d. Toxicity subsequently averaged 299% higher than controls, average biovolume 24% lower controls because suppression grazed treatments. Grazer‐induced returned to control levels after...
Prymnesium parvum is a bloom forming haptophyte that has been responsible for numerous fish kill events across the world. The toxicity of P. attributed to production large polyketide compounds, collectively called prymnesins, which based on their structure can be divided into A-, B- and C-type. chemical nature prymnesins indicates potential involvement synthases (PKSs) in biosynthesis. However, little known about presence PKSs as well molecular trade-offs toxin In current study, we generated...
Abstract Toxic microalgae have their own pathogens, and understanding the way in which these respond to antagonistic attacks may provide information about capacity persist during harmful algal bloom events. Here, we compared effects of physical presence parasite Amoebophrya sp. exposure waterborne cues from cultures infected with this parasite, on gene expression by toxic dinoflagellates, Alexandrium fundyense . Compared control samples, a total 14 882 genes were differentially expressed...
The effect of temperature on ectothermic organisms in the context climate change has long been considered isolation (i.e. as a single driver). This is challenged by observations demonstrating that temperature-dependent growth correlated to further factors. However, little known how chronobiological history an organism reflected its adaptation re-occurring cyclic patterns environment (e.g. annual range photoperiods habitat) and biotic interactions with microbiome, contribute shaping realized...
Phenotypic plasticity is commonplace and enables an organism to respond variations in the environment. Plastic responses often modify a suite of traits can be triggered by both abiotic biotic changes. Here we analysed plastic response towards grazer two genotypes marine dinoflagellate Alexandrium fundyense, evaluated similarity this discuss potential strain-specific trade-offs. We compared expression known inducible defensive paralytic shellfish toxin content, chain length. The effectiveness...
Dinoflagellates and diatoms are among the most prominent microeukaryotic plankton groups, they have evolved different functional traits reflecting their roles within ecosystems. However, links between metabolic processes environmental contexts warrant further study. The biodiversity of dinoflagellates was accessed with metatranscriptomics using Pfam protein domains as proxies for processes. Despite overall geographic similarity responses, abiotic (i.e., temperature salinity; ~800 domains)...