A5047685723- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Protist diversity and phylogeny
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine Bivalve and Aquaculture Studies
- Marine Biology and Ecology Research
- Advanced Battery Technologies Research
- Genomics and Phylogenetic Studies
- Diatoms and Algae Research
- Methane Hydrates and Related Phenomena
- Ionic liquids properties and applications
- Identification and Quantification in Food
- Isotope Analysis in Ecology
- Marine and coastal plant biology
- Biocrusts and Microbial Ecology
- Algal biology and biofuel production
- Extraction and Separation Processes
- Microbial Fuel Cells and Bioremediation
- Geology and Paleoclimatology Research
- Mine drainage and remediation techniques
- Cultural Heritage Materials Analysis
- Alcoholism and Thiamine Deficiency
- Mercury impact and mitigation studies
University of Amsterdam
2011-2024
Institut de Ciències del Mar
2019-2023
University of California, Santa Cruz
2023
Institut Català de Ciències del Clima
2023
Monterey Bay Aquarium Research Institute
2013-2022
Netherlands Institute of Ecology
2009-2017
Lund University
2014-2017
Chalmers University of Technology
2011-2015
GEOMAR Helmholtz Centre for Ocean Research Kiel
2011
Royal Netherlands Academy of Arts and Sciences
2010
Abstract. The traditional view of the planktonic food web describes consumption inorganic nutrients by photoautotrophic phytoplankton, which in turn supports zooplankton and ultimately higher trophic levels. Pathways centred on bacteria provide mechanisms for nutrient recycling. This structure lies at foundation most models used to explore biogeochemical cycling, functioning biological pump, impact climate change these processes. We suggest an alternative new paradigm, sees bulk base this...
Arranging organisms into functional groups aids ecological research by grouping (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally have been split between photoautotrophic “phytoplankton” and phagotrophic “microzooplankton”. However, there is a growing recognition the importance mixotrophy euphotic aquatic systems, where many often combine modes nutrition. Such do not align traditional dichotomy phytoplankton...
Giant viruses are remarkable for their large genomes, often rivaling those of small bacteria, and having genes thought exclusive to cellular life. Most isolated date infect nonmarine protists, leaving strategies prevalence in marine environments largely unknown. Using eukaryotic single-cell metagenomics the Pacific, we discovered a Mimiviridae lineage giant viruses, which infects choanoflagellates, widespread protistan predators related metazoans. The ChoanoVirus genomes largest yet from...
Abstract The metabolic theory of ecology predicts that temperature affects heterotrophic processes more strongly than autotrophic processes. We hypothesized this differential response may shift mixotrophic organisms towards nutrition with rising temperature. hypothesis was tested in experiments the chrysophyte Ochromonas sp., grown under autotrophic, and conditions. Our results show (1) grazing rates on bacterial prey increased photosynthetic electron transport rates, (2) growth...
Independent of the specific electrode chemistry, state-of-the-art lithium ion battery electrolytes based on LiPF6 in organic solvents have a low thermal abuse tolerance and poor cycle life at elevated temperatures. We present here detailed investigation initial stages decomposition EC/DMC stored 85 °C using Raman NMR spectroscopy. During storage (up to 160 h), significant amounts CO2 are evolved, as detected spectra. Time-resolved 1H, 31P, 19F spectra show evolution POF3, POF(OH)2,...
Abstract The endosymbiotic origin of plastids from cyanobacteria gave eukaryotes photosynthetic capabilities and launched the diversification countless forms algae. These primary are found in members eukaryotic supergroup Archaeplastida. All known archaeplastids still retain some form plastids, which widely assumed to have a single origin. Here, we use single-cell genomics natural samples combined with phylogenomics infer evolutionary phylum Picozoa, globally distributed but seemingly rare...
Summary Mixotrophy is increasingly recognized as an important and widespread nutritional strategy in various taxonomic groups ranging from protists to higher plants. We hypothesize that the availability of alternative carbon energy sources during mixotrophy allows a switch photoheterotrophic growth, where photosynthetic apparatus mainly provides but not fixed carbon. Because such change function machinery probably reflected its composition, we compared Ochromonas danica autotrophic...
Abstract Eukaryotic phytoplankton form the basis of aquatic food webs and play a key role in global carbon cycle. Many these evolutionarily diverse microalgae are also capable feeding on other microbes, hence simultaneously act both as primary producers consumers. The net ecosystem impact such mixotrophs depends their nutritional strategy which is likely to alter with environmental change. temperate lakes currently warming at unprecedented rates increasing water color (browning) due...
Abstract Globally, freshwater ecosystems are warming at unprecedented rates and northern temperate lakes simultaneously experiencing increased runoff of humic substances (brownification), with little known consequences for future conservation biodiversity ecosystem functioning. We employed an outdoor mesocosm experiment during spring summer to investigate the combined effects gradually increasing brownification perturbations on phytoplankton community structure (biodiversity composition)...
Vitamin B1 (thiamine pyrophosphate, TPP) is essential to all life but scarce in ocean surface waters. In many bacteria and a few eukaryotic groups thiamine biosynthesis genes are controlled by metabolite-sensing mRNA-based gene regulators known as riboswitches. Using available genome sequences transcriptomes generated from ecologically important marine phytoplankton, we identified 31 new These were found alveolate, cryptophyte, haptophyte rhizarian phytoplankton well taxa two lineages...
Many marine microbial eukaryotes combine photosynthetic with phagotrophic nutrition, but incomplete understanding of such mixotrophic protists, their functional diversity, and underlying physiological mechanisms limits the assessment modeling roles in present future ocean ecosystems. We developed an experimental system to study responses protists availability living prey light, used it characterize contrasting strategies two stramenopiles genus Ochromonas. show that oceanic isolate CCMP1393...
Phaeocystis is a globally widespread marine phytoplankton genus, best known for its colony-forming species that can form large blooms and odorous foam during bloom decline. In the North Sea, globosa typically becomes abundant towards end of spring bloom, when nutrients are depleted share mixotrophic protists increases. Although mixotrophy across eukaryotic tree life also found amongst haptophytes, nutrition has not yet been demonstrated in Phaeocystis. Here, we sampled two consecutive...
Summary Photosynthetic picoeukaryotes contribute a significant fraction of primary production in the upper ocean. Micromonas pusilla is an ecologically relevant photosynthetic picoeukaryote, abundantly and widely distributed marine waters. Grazing by protists may control abundance such as M. , but diversity responsible grazers poorly understood. To identify consuming productive North Pacific Ocean region, we amended seawater with living 15 N, 13 C‐labelled cells 24‐h replicated bottle...
Much is known about how broad eukaryotic phytoplankton groups vary according to nutrient availability in marine ecosystems. However, genus- and species-level dynamics are generally unknown, although important given that adaptation acclimation processes differentiate at these levels. We examined communities across seasonal cycles the North Atlantic (BATS) under different trophic conditions eastern Pacific (ENP), using phylogenetic classification of plastid-encoded 16S rRNA amplicon sequence...
Prochlorococcus is a key member of open-ocean primary producer communities. Despite its importance, little known about the predators that consume this cyanobacterium and make biomass available to higher trophic levels. We identify potential along gradient wherein abundance increased from near detection limits (coastal California) >200,000 cells mL −1 (subtropical North Pacific Gyre). A replicated RNA-Stable Isotope Probing experiment involving in situ community, labeled as prey, revealed...
Recent studies show that both marine and limnic microalgal species often consist of several genetically distinct populations. This is also valid for the nuisance freshwater algae Gonyostomum semen, which originates from acidic, brown water swamp lakes, but can nowadays be found in clearer lakes with close to neutral pH. We hypothesized observed genetic differentiation among G. semen lake populations, reported earlier studies, connected adaptation local environmental conditions. In present...
Iron limitation often results in increased cellular silica contents of diatoms, suggesting that diatoms grow thicker and possibly mechanically stronger frustules when limited. We performed stability measurements for six diatom species grown under iron‐limitation iron‐sufficient conditions. Frustule strength all iron limitation, with this effect being statistically significant four them. Valve morphology content the pennate Fragilariopsis kerguelensis centric Coscinodiscus wailesii changed...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 59:207-216 (2010) - DOI: https://doi.org/10.3354/ame01395 Microcystins do not provide anti-herbivore defence against mixotrophic flagellates Susanne Wilken1,2,*, Suzanne Wiezer1, Jef Huisman2, Ellen Van Donk1,3 1Department of Ecology, Netherlands Institute Rijksstraatweg 6, 3631 AC Nieuwersluis, The 2Aquatic...