A5007393450- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Social and Educational Sciences
- Ocean Acidification Effects and Responses
- Protist diversity and phylogeny
- Diatoms and Algae Research
- Polar Research and Ecology
- Rare-earth and actinide compounds
- Health, psychology, and well-being
- Peatlands and Wetlands Ecology
- Early Childhood Education and Development
- Hydrogen Storage and Materials
- Boron and Carbon Nanomaterials Research
- Marine Bivalve and Aquaculture Studies
- Vibrio bacteria research studies
- Cancer survivorship and care
- Marine and coastal plant biology
- Superconductivity in MgB2 and Alloys
- Phosphorus and nutrient management
- Hearing Impairment and Communication
- Light effects on plants
- Wireless Sensor Networks for Data Analysis
Swedish University of Agricultural Sciences
2021-2025
University of Gothenburg
2004-2024
Swedish Meteorological and Hydrological Institute
2019-2022
University of Georgia
2020-2022
Stockholm University
1998
Uppsala University
1997
Abstract Microbes of the surface ocean release, consume, and exchange labile metabolites at time scales minutes to days. The details this important step in global carbon cycle remain poorly resolved, largely due methodological challenges studying a diverse pool that are produced consumed nearly simultaneously. In perspective, new compilation published data builds on previous studies obtain an updated estimate fraction marine net primary production passes through dissolved organic (DOC) pool....
Abstract Blooms of dark pigmented microalgae accelerate glacier and ice sheet melting by reducing the surface albedo. However, role nutrient availability in regulating algal growth on remains poorly understood. Here, we investigate algae Greenland Ice Sheet, providing single-cell measurements carbon:nitrogen:phosphorus (C:N:P) ratios assimilation rates dissolved inorganic carbon (DIC), ammonium nitrate following amendments. The analyses reveal high C:N C:P atomic biomass as well...
We analysed N2 - and carbon (C) fixation in individual cells of Baltic Sea cyanobacteria by combining stable isotope incubations with secondary ion mass spectrometry (SIMS). Specific growth rates based on C-fixation were higher for Dolichospermum spp. than Aphanizomenon sp. Nodularia spumigena. The cyanobacterial biomass, however, was dominated sp., which contributed most to total -fixation surface waters the Northern Proper. Pseudanabaena colonial picocyanobacteria not detectable. N....
Almost every summer, dense blooms of filamentous cyanobacteria are formed in the Baltic Sea. These may cause problems for tourism and ecosystem services, where surface accumulations beach fouling commonly occurring. Future changes environmental drivers, including climate change other anthropogenic disturbances, further enhance these problems. By compiling monitoring data from countries adjacent to Sea, we present spatial temporal genus-specific distribution diazotrophic (Nostocales) during...
Abstract Growth of large phytoplankton is considered to be diffusion limited at low nutrient concentrations, yet their constraints and contributions carbon (C) nitrogen fluxes in field plankton communities are poorly quantified under this condition. Using secondary ion mass spectrometry (SIMS), we cell-specific assimilation rates C, nitrate, ammonium summer when dissolved inorganic concentrations temperate coastal regions. Chain-forming diatoms composed 6% total particulate organic carbon,...
Dense blooms of diazotrophic filamentous cyanobacteria are formed every summer in the Baltic Sea. We estimated their contribution to nitrogen fixation by combining two decades cyanobacterial biovolume monitoring data with recently measured genera-specific rates. In Bothnian Sea, rates were 80 kt N year-1, which has doubled during recent and now exceeds external loading from rivers atmospheric deposition 69 year-1. The Proper was 399 agrees well previous estimates using other approaches is...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 77:111-123 (2016) - DOI: https://doi.org/10.3354/ame01795 Inorganic phosphorus enrichments in Baltic Sea water have large effects on growth, carbon fixation, and N2 fixation by Nodularia spumigena Malin Olofsson1,*, Jenny Egardt2, Arvind Singh3, Helle Ploug1 1Department of Marine Sciences, University Gothenburg, Box 460,...
Abstract Biological nitrogen fixation is the conversion of dinitrogen (N 2 ) gas into bioavailable by microorganisms with consequences for primary production, ecosystem function, and global climate. Here we present a compiled dataset 4793 ‐fixation) rates measured in water column benthos inland coastal systems via acetylene reduction assay, 15 N labeling, or /Ar technique. While data are distributed across seven continents, most observations (88%) from northern hemisphere. labeling accounted...
Abstract Temperature and CO 2 levels are projected to increase in the future, with consequences for carbon nutrient cycling brackish environments, such as Baltic Sea. Moreover, filamentous cyanobacteria predicted be favored over other phytoplankton groups under these conditions. Under a 12-day outdoor experiment, we examined effect on natural spring bloom community of elevated temperature (from 1°C 4°C) p 390 970 μatm). No effects or were observed biovolumes, but significantly higher...
Helcom scenario modelling suggests that the Baltic Sea, one of largest brackish-water bodies in world, could expect increased precipitation (decreased salinity) and concentration atmospheric CO2 over next 100 years. These changes are expected to affect microplanktonic food web, thereby nutrient carbon cycling, a complex possibly synergistic manner. In Proper, extensive summer blooms dominated by filamentous cyanobacteria Aphanizomenon sp., Dolichospermum spp. toxic Nodularia spumigena...
Summary Almost a century ago Redfield discovered relatively constant ratio between carbon, nitrogen and phosphorus in particulate organic matter of dissolved nutrients seawater. Since then, the riverine export to ocean has increased 20 fold. High abundance resting stages sediment layers dated more than back indicate that common planktonic diatom Skeletonema marinoi endured this eutrophication. We germinated unique genotypes from originating isotope‐dated (15 80 years old) eutrophied fjord....
Abstract Organic carbon transfer between surface ocean photosynthetic and heterotrophic microbes is a central but poorly understood process in the global cycle. In model community which diatom extracellular release of organic molecules sustained growth co-cultured bacterium, we determined quantitative changes endometabolome bacterial uptake transcriptome over two diel cycles. Of nuclear magnetic resonance (NMR) peaks endometabolites, 38% had patterns with noon or mid-afternoon maxima;...
Phytoplankton-derived metabolites fuel a large fraction of heterotrophic bacterial production in the global ocean, yet methodological challenges have limited our understanding organic molecules transferred between these microbial groups. In an experimental bloom study consisting three marine bacteria growing together with diatom Thalassiosira pseudonana, we concurrently measured endometabolites (i.e., potential exometabolite supply) by nuclear magnetic resonance (NMR) spectroscopy and gene...
Abstract Dissolved primary production released into seawater by marine phytoplankton is a major source of carbon fueling heterotrophic bacterial in the ocean. The composition organic compounds healthy poorly known and difficult to assess with existing chemical methods. Here, expression transporter catabolic genes three model bacteria (Ruegeria pomeroyi DSS-3, Stenotrophomonas sp. SKA14, Polaribacter dokdonensis MED152) was used as biological sensor metabolites from picoeukaryote Micromonas...
The planktonic marine diatom Skeletonema marinoi forms resting stages, which can survive for decades buried in aphotic, anoxic sediments and resume growth when re‐exposed to light, oxygen, nutrients. mechanisms by they maintain cell viability during dormancy are poorly known. Here, we investigated cell‐specific nitrogen (N) carbon (C) assimilation survival rate stages of three S. strains. Resting were incubated with stable isotopes dissolved inorganic N ( DIN ), the form 15 N‐ammonium NH 4 +...
Abstract. Dense blooms of filamentous diazotrophic cyanobacteria are formed every summer in the Baltic Sea. These autotrophic organisms may bypass nitrogen limitation by performing fixation, which also governs surrounding increasing bioavailable nitrogen. The magnitude fixation is important to estimate from a management perspective since this might counteract eutrophication reduction measures. Here, life cycle model has been implemented for first time high-resolution 3D coupled physical and...
Dense blooms of filamentous cyanobacteria are recurrent phenomena in the Baltic Sea, with occasional negative effects on surrounding ecosystem, as well tourism, human health, aquaculture, and fisheries. Establishing a climate service is therefore suggested; including multi-method observations biomass, biodiversity, biogeography, correspondence to biotic abiotic factors. Three different approaches were compared for determination spatial temporal variability trends blooms; 1) microscopy-based...
Abstract Aquatic phytoplankton experience large fluctuations in environmental conditions during seasonal succession and across salinity gradients, but the impact of this variation on their diversity is poorly understood. We examined spatio-temporal nano- microphytoplankton (> 2 µm) community structure using almost two decades light-microscope based monitoring data. The dataset encompasses 19 stations that span a gradient from 2.8 to 35 along Swedish coastline. Spatially, both regional...
Climate change and coastal management directly affect the magnitude of nutrient loads functioning zones. In this novel approach, a coastal-zone-model was used to study future retention capacity nitrogen phosphorus changes in cyanobacterial blooms an archipelago eutrophied sea. By conducting projections under combined impact changing climate we demonstrate that i) filter efficiency increases compared present day regardless load projection, ii) cyanobacteria biomass increased 5-fold worst-case...
A new quaternary hydride, NaBaPdH3, has been synthesized. The novel structure type was refined, in the hexagonal space group P63/mmc, from single-crystal X-ray data complemented by neutron powder diffraction corresponding deuteride. unit cell dimensions at 150 K were determined to be a = 6.049(1) Å and c 6.061(3) Å. consists of trigonal planar PdH3 complex anions, with formally zerovalent palladium, framework sodium barium counterions. It is related CaCuP structure, P atom site Ba Na Cu Ca...
The interface between terrestrial ecosystems and inland waters is an important link in the global carbon cycle. However, extent to which allochthonous organic matter entering freshwater systems plays a major role microbial higher-trophic-level processes under debate. Human perturbations can alter fluxes of aquatic environments complex ways. biomass production microbes are traditionally thought be resource limited via stoichiometric constraints such as nutrient ratios or standing stock at...