A5002400330- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Marine and coastal plant biology
- Paleontology and Stratigraphy of Fossils
- Diatoms and Algae Research
- Microplastics and Plastic Pollution
- Aquatic Ecosystems and Phytoplankton Dynamics
- Ocean Acidification Effects and Responses
- Environmental DNA in Biodiversity Studies
- Marine Biology and Environmental Chemistry
- Marine Toxins and Detection Methods
- Spaceflight effects on biology
- Algal biology and biofuel production
- Marine Bivalve and Aquaculture Studies
- Geology and Paleoclimatology Research
- Integrated Water Resources Management
- Genomics and Phylogenetic Studies
- Aquaculture Nutrition and Growth
- Environmental Science and Water Management
- Effects and risks of endocrine disrupting chemicals
- Methane Hydrates and Related Phenomena
- Pharmaceutical and Antibiotic Environmental Impacts
- Geochemistry and Elemental Analysis
Norwegian Institute for Water Research
2023-2025
University of Oslo
2018-2025
Uppsala University
2014-2023
University of Zagreb
2011-2015
Abstract Haptophyta encompasses more than 300 species of mostly marine pico‐ and nanoplanktonic flagellates. Our aims were to investigate the Oslofjorden haptophyte diversity vertical distribution by metabarcoding, improve approach study community composition, richness proportional abundance comparing two rRNA markers scanning electron microscopy ( SEM ). Samples collected in August 2013 at Outer Oslofjorden, Norway. Total RNA / cDNA was amplified haptophyte‐specific primers targeting V4...
Abstract Global warming is rapidly altering physicochemical attributes of Arctic waters. These changes are predicted to alter microbial networks, potentially perturbing wider community functions including parasite infections and saprotrophic recycling biogeochemical compounds. Specifically, the interaction between autotrophic phytoplankton heterotrophic fungi e.g. chytrids (fungi with swimming tails) requires further analysis. Here, we investigate diversity distribution patterns in relation...
Plastic particles can impact the environmental fate and bioavailability of essential inorganic micronutrients non-essential (toxic) metals. The sorption metals to plastic has been demonstrated be facilitated by ageing, a phenomenon encompassing an array physical, chemical, biological processes. This study deploys factorial experiment untangle role different ageing processes in determining Plastics made three polymer types were aged both through abiotic (ultraviolet irradiation, UV) biotic...
Abstract Algal-based wastewater remediation systems (phycoremediation) include phycosphere bacterial communities that influence algal growth, pollutant remediation, and downstream applications of biomass as fertilizers or bio-stimulants. This study investigated the community dynamics in a novel phycoremediation system using co-culture green algae Stigeoclonium sp. Oedogonium vaucheri . Bacterial abundance was estimated flow cytometry (FCM), while composition assessed through 16S rRNA gene...
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. Rising ocean temperatures will likely increase stratification of the water column and reduce nutrient input into photic zone. This likelihood limitation in marine microalgae, leading to changes abundance composition phytoplankton communities, which turn affect global biogeochemical cycles. Calcifying algae, such as coccolithophores, influence carbon cycle by fixing CO2 particulate organic through photosynthesis (POC production) inorganic calcification (PIC production). As produces...
During the June 2010 survey of phytoplankton and physicochemical parameters in Krka River estuary (eastern Adriatic Sea), a cryptophyte bloom was observed. High abundance cryptophytes (maximum 7.9×106 cells l–1) high concentrations class-specific biomarker pigment alloxanthine 2312 ng were detected surface layer at halocline lower reach estuary. Taxonomical analysis revealed that blooming species Plagioselmis cf. prolonga. Analysis environmental suggested supported by slower river flow as...
Coccolithophores (calcifying haptophyte algae) commonly exhibit a heteromorphic life cycle, alternating between morphologically distinct heterococcolith (diploid) and holococcolith (haploid) phases. The prevalence of each phase in coccolithophore community defines its overall ecological biogeochemical performance due to differences physiology, biomass calcification. main drivers life-cycle dynamics preferences the two life-phases are still unclear field data high taxonomic resolution needed....
Haptophytes are photosynthetic protists found in both freshwater and marine environments with an origin possibly dating back to the Neoproterozoic era. The most recent molecular phylogeny reveals several haptophyte “mystery clades” that await morphological verification, but it is otherwise highly consistent morphology-based phylogenies, including of coccolithophores (calcifying haptophytes). fossil coccolith record offers unique insights into extinct lineages, adaptive radiations produced...
Abstract The steady increase in global ocean temperature will most likely lead to nutrient limitation the photic zone. This impact physiology of marine algae, including globally important calcifying coccolithophores. Understanding their adaptive patterns is essential for modelling carbon production a low-nutrient ocean. We investigated Helicosphaera carteri , representative abundant but under-investigated flagellated functional group Two strains isolated from contrasting regimes (South...
Understanding the processes that shape community structure of Arctic phytoplankton is crucial for predicting responses ecosystems to ongoing ocean warming. In particular, little known about importance dispersal by North Atlantic Current and prevalence maintenance endemism. We investigated diversity biogeography diatoms from five Svalbard fjords Hausgarten observatory (Fram Strait) combining diatom cultivation 18S rRNA gene metabarcoding. total, 50 strains were isolated area during HE492...
The haptophyte Chrysochromulina leadbeateri formed the most devastating fish-killing algal bloom ever recorded in Norway, May and June 2019. resulted death of 14,500 tons farmed salmon Nordland Troms Counties large economic losses to aquaculture industry region. Fish mortalities due blooms this species have occurred before region 1991. Environmental conditions promoting formation growth C. are, however, still poorly understood. Here we investigated as a function temperature, salinity...
Abstract. Calcifying haptophytes (coccolithophores) sequester carbon in the form of organic and inorganic cellular components (coccoliths). We examined effect phosphorus (P) limitation heat stress on particulate (calcite) production coccolithophore Emiliania huxleyi. Both environmental stressors are related to rising CO2 levels affect marine microalgae, which turn impacts biogeochemical cycling. Using semi-continuous cultures, we show that P decrease calcification rate E. However, using...
:Four colonial species of the multipolar centric diatom genus Bacteriastrum – B. furcatum, hyalinum, jadranum and mediterraneum were investigated using field samples from Adriatic Sea cultured strains obtained these samples. Morphology frustule ultrastructure examined light electron microscopy, nuclear-encoded large-subunit (LSU) rDNA sequences strains. The description has been emended based on a novel mechanism colony formation in which cells are joined through an organic cell jacket holds...
Observations on the life cycle and ecology of Acanthoica quattrospina Lohmann from a Mediterranean estuary
Abstract. The biogeochemical impact of coccolithophores is defined not only by their overall abundance in the oceans but also wide ranges physiological traits such as cell size, degree calcification and carbon production rates between different species. Species' sensitivity to environmental forcing has been suggested relate cellular PIC : POC (particulate inorganic particulate organic carbon) ratio other constraints. Understanding both short-term longer-term adaptive strategies...
Scale-bearing siliceous nannoplankton are occasionally encountered in surface seawater samples, but rarely identified or illustrated. In this study, the morphological diversity of haptophyte Hyalolithus neolepis and enigmatic Petasaria heterolepis investigated scanning transmission electron microscopes using materials from around world. Results show that H. scales exhibit variation width marginal hyaline area, intermediate specimens make separation two morphologies difficult. also...
Background Phytoplankton is the base of majority ocean ecosystems. It responsible for half global primary production, and different phytoplankton taxa have a unique role in biogeochemical cycles. In addition, abundance diversity are highly susceptible to climate induced changes, hence monitoring its important necessary. Methods Water samples photosynthetic pigment analyses were collected boreal winter 2017, along transect North Pacific Subtropical Gyre (NPSG) California Current System (CCS)....