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  • 1.
    Fernández-Brime, Samantha
    et al.
    Swedish Museum of Natural History, Department of Botany.
    Muggia, Lucia
    Maier, S.
    Grube, Martin
    Wedin, Mats
    Swedish Museum of Natural History, Department of Botany.
    Bacterial communities in an optional lichen symbiosis are determined by substrate, not algal photobionts2019In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 95, article id fiz012Article in journal (Refereed)
  • 2. Muggia, Lucia
    et al.
    Fernández-Brime, Samantha
    Swedish Museum of Natural History, Department of Botany.
    Grube, Martin
    Wedin, Mats
    Swedish Museum of Natural History, Department of Botany.
    Schizoxylon as an experimental model for studying interkingdom symbiosis.2016In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 92, article id fiw165Article in journal (Refereed)
  • 3. Muggia, Lucia
    et al.
    Vancurova, Lucie
    Skaloud, Pavel
    Peksa, Ondrej
    Wedin, Mats
    Swedish Museum of Natural History, Department of Botany.
    Grube, Martin
    The symbiotic playground of lichen thalli - a highly flexible photobiont association in rock-inhabiting lichens2013In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 85, p. 313-325Article in journal (Refereed)
  • 4. Svedén, J.
    et al.
    Adam, B.
    Walve, J.
    Nahar, N.
    Musat, N.
    Lavik, G.
    Whitehouse, Martin J.
    Swedish Museum of Natural History, Department of Geology.
    Kuypers, M.
    Ploug, H.
    High cell-specific rates of nitrogen and carbon fixation by the cyanobacterium Aphanizomenon sp. at low temperatures in the Baltic Sea2015In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 91, p. 1-10, article id fiv131Article in journal (Refereed)
    Abstract [en]

    Aphanizomenon is a widespread genus of nitrogen (N2)-fixing cyanobacteria in lakes and estuaries, accounting for a large fraction of the summer N2-fixation in the Baltic Sea. However, information about its cell-specific carbon (C)- and N2-fixation rates in the early growth season has not previously been reported. We combined various methods to study N2-fixation, photosynthesis and respiration in field-sampled Baltic Sea Aphanizomenon sp. during early summer at 10°C. Stable isotope incubations at in situ light intensities during 24 h combined with cell-specific secondary ion mass spectrometry showed an average net N2-fixation rate of 55 fmol N cell(-1) day(-1). Dark net N2-fixation rates over a course of 12 h were 20% of those measured in light. C-fixation, but not N2-fixation, was inhibited by high ambient light intensities during daytime. Consequently, the C:N fixation ratio varied substantially over the diel cycle. C- and N2-fixation rates were comparable to those reported for Aphanizomenon sp. in August at 19°C, using the same methods. High respiration rates (23% of gross photosynthesis) were measured with (14)C-incubations and O2-microsensors, and presumably reflect the energy needed for high N2-fixation rates. Hence, Aphanizomenon sp. is an important contributor to N2-fixation at low in situ temperatures in the early growth season.

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