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Chemical microenvironments and single-cell carbon and nitrogen uptake in field-collected colonies of Trichodesmium under different pCO2
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2017 (Engelska)Ingår i: The ISME Journal, ISSN 1751-7362, E-ISSN 1751-7370, Vol. 11, s. 1305-1317Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Gradients of oxygen (O2) and pH, as well as small-scale fluxes of carbon (C), nitrogen (N) and O2 were investigated under different partial pressures of carbon dioxide (pCO2) in field-collected colonies of the marine dinitrogen (N2)-fixing cyanobacterium Trichodesmium. Microsensor measurements indicated that cells within colonies experienced large fluctuations in O2, pH and CO2concentrations over a day–night cycle. O2 concentrations varied with light intensity and time of day, yet colonies exposed to light were supersaturated with O2 (up to ~200%) throughout the light period and anoxia was not detected. Alternating between light and dark conditions caused a variation in pH levels by on average 0.5 units (equivalent to 15 nmol l−1 proton concentration). Single-cell analyses of C and N assimilation using secondary ion mass spectrometry (SIMS; large geometry SIMS and nanoscale SIMS) revealed high variability in metabolic activity of single cells and trichomes of Trichodesmium, and indicated transfer of C and N to colony-associated non-photosynthetic bacteria. Neither O2 fluxes nor C fixation by Trichodesmium were significantly influenced by short-term incubations under different pCO2 levels, whereas N2fixation increased with increasing pCO2. The large range of metabolic rates observed at the single-cell level may reflect a response by colony-forming microbial populations to highly variable microenvironments.

Ort, förlag, år, upplaga, sidor
2017. Vol. 11, s. 1305-1317
Nationell ämneskategori
Ekologi
Forskningsämne
Ekosystem och arthistoria
Identifikatorer
URN: urn:nbn:se:nrm:diva-2537DOI: 10.1038/ismej.2017.15OAI: oai:DiVA.org:nrm-2537DiVA, id: diva2:1162126
Tillgänglig från: 2017-12-03 Skapad: 2017-12-03 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Förlagets fulltexthttps://www.nature.com/articles/ismej201715

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