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  • 1.
    Bouchet, Sylvain
    et al.
    Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Pau 64000, France.
    Soerensen, Anne L.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Björn, Erik
    Department of Chemistry, Umeå University, Umeå 90187, Sweden.
    Tessier, Emmanuel
    Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Pau 64000, France.
    Amouroux, David
    Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Pau 64000, France.
    Mercury Sources and Fate in a Large Brackish Ecosystem (the Baltic Sea) Depicted by Stable Isotopes2023In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851Article in journal (Refereed)
    Abstract [en]

    Identifying Hg sources to aquatic ecosystems and processes controlling the levels of monomethylmercury (MMHg) is critical for developing efficient policies of Hg emissions reduction. Here we measured Hg concentrations and stable isotopes in sediment, seston, and fishes from the various basins of the Baltic Sea, a large brackish ecosystem presenting extensive gradients in salinity, redox conditions, dissolved organic matter (DOM) composition, and biological activities. We found that Hg mass dependent fractionation (Hg-MDF) values in sediments mostly reflect a mixing between light terrestrial Hg and heavier industrial sources, whereas odd Hg isotope mass independent fractionation (odd Hg-MIF) reveals atmospheric inputs. Seston presents intermediate Hg-MDF and odd Hg-MIF values falling between sediments and fish, but in northern basins, high even Hg-MIF values suggest the preferential accumulation of wet-deposited Hg. Odd Hg-MIF values in fish indicate an overall low extent of MMHg photodegradation due to limited sunlight exposure and penetration but also reveal large spatial differences. The photodegradation extent is lowest in the central basin with recurrent algal blooms due to their shading effect and is highest in the northern, least saline basin with high concentrations of terrestrial DOM. As increased loads of terrestrial DOM are expected in many coastal areas due to global changes, its impact on MMHg photodegradation needs to be better understood and accounted for when predicting future MMHg concentrations in aquatic ecosystems.

  • 2.
    Capo, Eric
    et al.
    Umeå University.
    Caiyan, Feng
    Umeå University.
    Bravo, Andrea G.
    Institute of Marine Sciences, Spanish National Research Council (CSIC).
    Bertilsson, Stefan
    Swedish University of Agricultural Sciences,.
    Soerensen, Anne L.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Pinhassi, Jarone
    Linnaeus University.
    Buck, Moritz
    Swedish University of Agricultural Sciences,.
    Karlsson, Camilla
    Linnaeus University.
    Hawkes, Jeffrey
    Uppsala University.
    Björn, Erik
    Umeå University.
    Expression Levels of hgcAB Genes and Mercury Availability Jointly Explain Methylmercury Formation in Stratified Brackish Waters2022In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851Article in journal (Refereed)
    Abstract [en]

    Neurotoxic methylmercury (MeHg) is formed by microbial methylation of inorganic divalent Hg (HgII) and constitutes severe environmental and human health risks. The methylation is enabled by hgcA and hgcB genes, but it is not known if the associated molecular-level processes are rate-limiting or enable accurate prediction of MeHg formation in nature. In this study, we investigated the relationships between hgc genes and MeHg across redox-stratified water columns in the brackish Baltic Sea. We showed, for the first time, that hgc transcript abundance and the concentration of dissolved HgII-sulfide species were strong predictors of both the HgII methylation rate and MeHg concentration, implying their roles as principal joint drivers of MeHg formation in these systems. Additionally, we characterized the metabolic capacities of hgc+ microorganisms by reconstructing their genomes from metagenomes (i.e., hgc+ MAGs), which highlighted the versatility of putative HgII methylators in the water column of the Baltic Sea. In establishing relationships between hgc transcripts and the HgII methylation rate, we advance the fundamental understanding of mechanistic principles governing MeHg formation in nature and enable refined predictions of MeHg levels in coastal seas in response to the accelerating spread of oxygen-deficient zones.

  • 3.
    Faxneld, Suzanne
    et al.
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Berger, Urs
    Department of Environmental Science and Analytical Chemistry, Stockholm University, Department of Analytical Chemistry, Helmholtz Centre for Environmental Research.
    Helander, Björn
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Danielsson, Sara
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Miller, Aroha
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Nyberg, Elisabeth
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Persson, Jan-Olov
    Department of Mathematics, Stockholm University.
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Temporal trends and geographical differences of perfluoroalkyl acids in Baltic Sea herring and white-tailed sea eagle eggs in Sweden2016In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851Article in journal (Refereed)
  • 4. Gebbink, Wouter A
    et al.
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Berger, Urs
    Perfluoroalkyl Acids (PFAAs) and Selected Precursors in the Baltic Sea Environment: Do Precursors Play a Role in Food Web Accumulation of PFAAs?2016In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 50, no 12Article in journal (Refereed)
    Abstract [en]

    The present study examined the presence of perfluoroalkyl acids (PFAAs) and selected precursors in the Baltic Sea abiotic environment and guillemot food web, and investigated the relative importance of precursors in food web accumulation of PFAAs. Sediment, water, zooplankton, herring, sprat, and guillemot eggs were analyzed for perfluoroalkane sulfonic acids (PFSAs; C4,6,8,10) and perfluoroalkyl carboxylic acids (PFCAs; C6-15) along with six perfluoro-octane sulfonic acid (PFOS) precursors and 11 polyfluoroalkyl phosphoric acid diesters (diPAPs). FOSA, FOSAA and its methyl and ethyl derivatives (Me- and EtFOSAA), and 6:2/6:2 diPAP were detected in sediment and water. While FOSA and the three FOSAAs were detected in all biota, a total of nine diPAPs were only detected in zooplankton. Concentrations of PFOS precursors and diPAPs exceeded PFOS and PFCA concentrations, respectively, in zooplankton, but not in fish and guillemot eggs. Although PFOS precursors were present at all trophic levels, they appear to play a minor role in food web accumulation of PFOS based on PFOS precursor/PFOS ratios and PFOS and FOSA isomer patterns. The PFCA pattern in fish could not be explained by the intake pattern based on PFCAs and analyzed precursors, that is, diPAPs. Exposure to additional precursors might therefore be a dominant exposure pathway compared to direct PFCA exposure for fish.

  • 5. Meng, Xiang-Zhou
    et al.
    Venkatesan, Arjun K
    Ni, Yi-Lin
    Steele, Joshua C
    Wu, Ling-Ling
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Bergman, Åke
    Halden, Rolf U
    Organic Contaminants in Chinese Sewage Sludge: A Meta-Analysis of the Literature of the Past 30 Years.2016In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 50, no 11Article in journal (Refereed)
    Abstract [en]

    The production of sewage sludge is increasing in China but with unsafe disposal practices, causing potential risk to human health and the environment. Using literature from the past 30 years (N = 159), we conducted a meta-analysis of organic contaminants (OCs) in Chinese sludge. Most data were available from developed and populated regions, and no data were found for Tibet. Since 1987, 35 classes of chemicals consisting of 749 individual compounds and 1 mixture have been analyzed, in which antibiotics and polycyclic aromatic hydrocarbons (PAHs) were the most targeted analytes. For 13 classes of principal OCs (defined as chemicals detected in over five studies) in sludge, the median (expressed in nanograms per gram dry weight) was the highest for phthalate esters (27 900), followed by alkylphenol polyethoxylates (12 000), synthetic musks (5800), antibiotics (4240), PAHs (3490), ultraviolet stabilizers (670), bisphenol analogs (160), organochlorine pesticides (110), polybrominated diphenyl ethers (100), pharmaceuticals (84), hormones (69), perfluorinated compounds (21), and polychlorinated biphenyls (15). Concentrations of PAHs in sludges collected between 1998 and 2012 showed a decreasing trend. Study findings suggest the need for a Chinese national sewage sludge survey to identify and regulate toxic OCs, ideally employing both targeted as well as nontargeted screening approaches.

  • 6. Norrgran, Jessica
    et al.
    Jones, Bernt
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Athanassiadis, Ioannis
    Bergman, Åke
    Higher PBDE serum concentrations may be associated with feline hyperthyroidism in Swedish cats.2015In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 49, no 8Article in journal (Refereed)
    Abstract [en]

    Serum from 82 individual cats was analyzed for decabromobiphenyl (BB-209), polybrominated diphenyl ethers (PBDEs), hydroxylated PBDEs (OH-PBDEs), and 2,4,6-TBP in order to study differences in body burden between healthy and sick cats diagnosed with Feline Hyperthyroidism (FH). Within the study group, 60 of these cats had a euthyroid (n = 23) or hyperthyroid (n = 37) status, all of which were used in the comparison. This study shows that hyperthyroid compared to euthyroid cats have higher serum concentrations for some of the investigated PBDEs (BDE-99, BDE-153, and BDE-183) and CB-153 on a fat weight basis. Further, it is intriguing, and beyond explanation, why the flame retardant BB-209 (discontinued in 2000) is present in all of the cat serum samples in concentrations similar to BDE-209. Median BDE-47/-99 ratios are 0.47 and 0.32 for healthy and euthyroid cats, respectively, which differs significantly from Swedes, where the ratio is 3.5. Another important finding is the occurrence of very low levels or the absence of hydroxylated PBDE metabolites in the cats. In addition, the major OH-PBDE, 6-OH-BDE47, is likely of natural origin, probably ingested via cat food. The statistics indicate an association between elevated PBDE concentrations in the cats and FH.

  • 7. Pokharel, Rasesh
    et al.
    Gerrits, Ruben
    Schuessler, Jan
    Frings, Patrick J
    Swedish Museum of Natural History, Department of Geology.
    Sobotka, Roman
    Gorbushina, Anna
    von Blanckenburg, Friedhelm
    Magnesium Stable Isotope Fractionation on a Cellular Level Explored by Cyanobacteria and Black Fungi with Implications for Higher Plants2018In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 52, p. 12216-12224Article in journal (Refereed)
    Abstract [en]

    In a controlled growth experiment we found that the cyanobacterium Nostoc punctiforme has a bulk cell 26Mg/24Mg ratio (expressed as δ26Mg) that is −0.27‰ lower than the growth solution at a pH of ca. 5.9. This contrasts with a recently published δ26Mg value that was 0.65‰ higher than growth solution for the black fungus Knufia petricola at similar laboratory conditions, interpreted to reflect loss of 24Mg during cell growth. By a mass balance model constrained by δ26Mg in chlorophyll extract we inferred the δ26 Mg value of the main Mg compartments in a cyanobacteria cell: free cytosolic Mg (−2.64‰), chlorophyll (1.85‰), and the nonchlorophyll-bonded Mg compartments like ATP and ribosomes (−0.64‰). The lower δ26Mg found in Nostoc punctiformewould thus result from the absence of significant Mg efflux during cell growth in combination with either (a) discrimination against 26Mg during uptake by desolvation of Mg or transport across protein channels or (b) discrimination against 24Mg in the membrane transporter during efflux. The model predicts the preferential incorporation of 26Mg in cells and plant organs low in Mg and the absence of isotope fractionation in those high in Mg, corroborated by a compilation of Mg isotope ratios from fungi, bacteria, and higher plants.

  • 8.
    Roos, Anna
    et al.
    Swedish Museum of Natural History, Department of Environmental research and monitoring. Department of Environmental Toxicology, Uppsala Universitet.
    Berger, Urs
    Stockholms Universitet.
    Järnberg, Ulf
    Department of Applied Environmental Science (ITM), Stockholm University, SE-106 91 Stockholm, Sweden.
    van Dijk, Jiska
    Norwegian Institute for Nature Research (NINA), NO-7485 Trondheim, Norway.
    Bignert, Anders
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Increasing Concentrations of Perfluoroalkyl Acids in Scandinavian Otters (Lutra lutra) between 1972 and 2011: A New Threat to the Otter Population?2013In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 47, no 20, p. 11757-11756Article, book review (Refereed)
  • 9.
    Sun, Jiachen
    et al.
    Univ of Antwerp Belgium.
    Helander, Björn
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Eulars, Igor
    Aarhus University, Roskilde, Denmark.
    White-Tailed Eagle (Haliaeetus albicilla) Body Feathers DocumentSpatiotemporal Trends of Perfluoroalkyl Substances in the NorthernEnvironment2019In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 53, no 21, p. 12744-12753Article in journal (Refereed)
    Abstract [en]

    ABSTRACT:

    We reconstructed the first long-term (1968−2015) spatiotemporal trends of perfluoroalkyl substances (PFAS) using archived body feathers of white-tailed eagles (Haliaeetus albicilla) from the West Greenland (n = 31), Norwegian (n = 66), and Central Swedish Baltic coasts (n = 50). We observed significant temporal trends of perfluorooctane sulfonamide (FOSA), perfluorooctane sulfonate (PFOS), and perfluoroalkyl carboxylates (ΣPFCAs) in all three subpopulations. Concentrations of FOSA and PFOS had started decreasing significantly since the mid-1990s to 2000 inthe Greenland and Norwegian subpopulations, consistent with the 3M phase-out, though in sharp contrast to overall increasing trends observed in the Swedish subpopulation. Moreover, ΣPFCA concentrations significantly increased in all three subpopulations throughout the study periods. These temporal trends suggest on going input of PFOS in the Baltic and of ΣPFCAs in all three regions. Considerable spatial variation in PFAS concentrations and profiles was observed: PFOS concentrations were significantly higher in Sweden, whereas FOSA and ΣPFCA concentrations were similar among the subpopulations. PFOS dominated the PFAS profiles in the Swedish and Norwegian subpopulations, in contrast to thedomination of FOSA and ΣPFCAs in the Greenland one. Our spatiotemporal observations underline the usefulness of archived bird of prey feathers in monitoring spatiotemporal PFAS trends and urge for continued monitoring efforts in each of the studied subpopulations.

  • 10.
    Sun, Jiachen
    et al.
    School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, CN-510632 Guangzhou, Guangdong, China.
    Shaw, Susan
    Shaw Institute, Blue Hill Research Center, Blue Hill ME-04614, Maine, United States.
    Berger, Michelle
    Shaw Institute, Blue Hill Research Center, Blue Hill ME-04614, Maine, United States.
    Halaska, Barbie
    The Marine Mammal Center, Sausalito CA-94965, California, United States.
    Roos, Anna
    Swedish Museum of Natural History, Department of Environmental research and monitoring. Department of Contaminant Research and Monitoring, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden.
    Bäcklin, Britt-Marie
    Swedish Museum of Natural History, Department of Environmental research and monitoring. Department of Contaminant Research and Monitoring, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden.
    Zheng, Xiaoshi
    School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, CN-510632 Guangzhou, Guangdong, China.
    Liu, Kunyan
    School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, CN-510632 Guangzhou, Guangdong, China.
    Wang, Yan
    Research Center of Harmful Algae and Marine Biology, Jinan University, CN-510632 Guangzhou, Guangdong, China.
    Chen, Da
    School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, CN-510632 Guangzhou, Guangdong, China.
    Spatiotemporal Trends of Legacy and Alternative Flame Retardants in Harbor Seals from the Coasts of California, the Gulf of Maine, and Sweden2022In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 56, no 9, p. 5714-5723Article in journal (Refereed)
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  • 11.
    Winnberg, Ulrika
    et al.
    Stockholms universitet.
    Rydén, Andreas
    Stockholms universitet.
    Löfstrand, Karin
    Stockholms universitet.
    Asplund, Lillemor
    Stockholms universitet.
    Bignert, Anders
    Swedish Museum of Natural History, Department of.
    Marsh, Göran
    Stockholms universitet.
    Novel Octabrominated Phenolic Diphenyl Ether Identified in Blue Mussels from the Swedish West Coast2014In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 48, p. 3319-3326Article in journal (Refereed)
  • 12.
    Yuan, Bo
    et al.
    Stockholms universitet.
    Vorkamp, Katrin
    Århus universitet.
    Roos, Anna
    Swedish Museum of Natural History, Department of Environmental research and monitoring. phD, Curator.
    Faxneld, Suzanne
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Sonne, Christian
    Århus universitet.
    Garbus, Svend Erik
    Århus universitet.
    Lind, Ylva
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Eulaers, Igor
    Århus universitet.
    Hellström, Peter
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Dietz, Rune
    Århus universitet.
    Persson, Sara
    Swedish Museum of Natural History, Department of Environmental research and monitoring.
    Bossi, Rossana
    Århus universitet.
    de Wit, Cynthia
    Stockholms universitet.
    Accumulation of short-, medium-, and long-chain chlorinated paraffins in marine and terrestrial animals from Scandinavia2019In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 53, p. 3526-3537Article in journal (Refereed)
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