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  • 1.
    Broman, Elias
    et al.
    Stockholm University.
    Bonaglia, Stefano
    Stockholm University.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Marzocchi, Ugo
    Aarhus University.
    Hall, Per O.J.
    University of Gothenburg.
    Nascimento, Francisco J.A.
    Stockholm University.
    Uncovering diversity and metabolic spectrum of animals in dead zone sediments2020Ingår i: Communications Biology, E-ISSN 2399-3642, Vol. 3, s. 1-12, artikel-id 106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ocean deoxygenation driven by global warming and eutrophication is a primary concern for marine life. Resistant animals may be present in dead zone sediments, however there is lack of information on their diversity and metabolism. Here we combined geochemistry, microscopy, and RNA-seq for estimating taxonomy and functionality of micrometazoans along an oxygen gradient in the largest dead zone in the world. Nematodes are metabolically active at oxygen concentrations below 1.8μmolL−1, and their diversity and community structure are different between low oxygen areas. This is likely due to toxic hydrogen sulfide and its potential to be oxidized by oxygen or nitrate. Zooplankton resting stages dominate the metazoan community, and these populations possibly use cytochrome c oxidase as an oxygen sensor to exit dormancy. Our study sheds light on mechanisms of animal adaptation to extreme environments. These biological resources can be essential for recolonization of dead zones when oxygen conditions improve.

    Ladda ner fulltext (pdf)
    fulltext
  • 2.
    Capo, Eric
    et al.
    Department of Chemistry Umeå University Umeå Sweden;Department of Aquatic Sciences and Assessment SLU Uppsala Uppsala Sweden.
    Broman, Elias
    Department of Ecology, Environment and Plant Sciences Stockholm University Stockholm Sweden;Baltic Sea Centre Stockholm University Stockholm Sweden.
    Bonaglia, Stefano
    Department of Ecology, Environment and Plant Sciences Stockholm University Stockholm Sweden;Department of Marine Sciences University of Gothenburg Gothenburg Sweden.
    Bravo, Andrea G.
    Department of Marine Biology and Oceanography Institute of Marine Sciences, Spanish National Research Council (CSIC) Barcelona Spain.
    Bertilsson, Stefan
    Department of Aquatic Sciences and Assessment SLU Uppsala Uppsala Sweden.
    Soerensen, Anne L.
    Naturhistoriska riksmuseet, Enheten för miljöforskning och övervakning. Swedish Museum of Natural History.
    Pinhassi, Jarone
    Centre for Ecology and Evolution in Microbial Model Systems ‐ EEMiS Linnaeus University Kalmar Sweden.
    Lundin, Daniel
    Centre for Ecology and Evolution in Microbial Model Systems ‐ EEMiS Linnaeus University Kalmar Sweden.
    Buck, Moritz
    Department of Aquatic Sciences and Assessment SLU Uppsala Uppsala Sweden.
    Hall, Per O. J.
    Department of Marine Sciences University of Gothenburg Gothenburg Sweden.
    Nascimento, Francisco J. A.
    Department of Ecology, Environment and Plant Sciences Stockholm University Stockholm Sweden;Baltic Sea Centre Stockholm University Stockholm Sweden.
    Björn, Erik
    Department of Chemistry Umeå University Umeå Sweden.
    Oxygen‐deficient water zones in the Baltic Sea promote uncharacterized Hg methylating microorganisms in underlying sediments2022Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 67, s. 135-146Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Human-induced expansion of oxygen-deficient zones can have dramatic impacts on marine systems and itsresident biota. One example is the formation of the potent neurotoxic methylmercury (MeHg) that is mediated bymicrobial methylation of inorganic divalent Hg (HgII) under oxygen-deficient conditions. A negative consequenceof the expansion of oxygen-deficient zones could be an increase in MeHg production due to shifts in microbialcommunities in favor of microorganisms methylating Hg. There is, however, limited knowledge about Hg-methylatingmicrobes, i.e., those carrying hgc genes critical for mediating the process, from marine sediments. Here, weaim to study the presence of hgc genes and transcripts in metagenomes and metatranscriptomes from four surfacesediments with contrasting concentrations of oxygen and sulfide in the Baltic Sea. We show that potential Hgmethylators differed among sediments depending on redox conditions. Sediments with an oxygenated surface featuredhgc-like genes and transcripts predominantly associated with uncultured Desulfobacterota (OalgD group)and Desulfobacterales (including Desulfobacula sp.) while sediments with a hypoxic-anoxic surface included hgccarryingVerrucomicrobia, unclassified Desulfobacterales, Desulfatiglandales, and uncharacterized microbes. Ourdata suggest that the expansion of oxygen-deficient zones in marine systems may lead to a compositional changeof Hg-methylating microbial groups in the sediments, where Hg methylators whose metabolism and biology havenot yet been characterized will be promoted and expand.

  • 3.
    Maciute, Adele
    et al.
    University of Gothenburg.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Berg, Peter
    University of Virginia Charlottesville.
    Glud, Ronnie N.
    University of Southern Denmark.
    Broman, Elias
    Stockholm University.
    Nascimento, Francisco J. A.
    Stockholm University.
    Bonaglia, Stefano
    University of Gothenburg.
    A microsensor‐based method for measuring respiration of individual nematodes2021Ingår i: Methods in Ecology and Evolution, E-ISSN 2041-210X, Vol. 12, nr 10, s. 1841-1847Artikel i tidskrift (Refereegranskat)
  • 4.
    Maciute, Adele
    et al.
    University of Gothenburg, Sweden.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Glud, Ronnie N.
    University of Southern Denmark.
    Broman, Elias
    Stockholm University, Sweden.
    Berg, Peter
    University of Virginia Charlottesville, USA.
    Nascimento, Francisco J. A.
    Stockholm University, Sweden.
    Bonaglia, Stefano
    University of Gothenburg, Sweden.
    Reconciling the importance of meiofauna respiration for oxygen demand in muddy coastal sediments2023Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 68, nr 8, s. 1895-1905Artikel i tidskrift (Refereegranskat)
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