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In-depth characterization of diazotroph activity across the western tropical South Pacific hotspot of N-2 fixation (OUTPACE cruise)
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Antal upphovsmän: 92018 (Engelska)Ingår i: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 15, nr 13, s. 4215-4232Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Here we report N-2 fixation rates from a similar to 4000 km transect in the western and central tropical South Pacific, a particularly undersampled region in the world ocean. Water samples were collected in the euphotic layer along a west to east transect from 160 degrees E to 160 degrees W that covered contrasting trophic regimes, from oligotrophy in the Melanesian archipelago (MA) waters to ultraoligotrophy in the South Pacific Gyre (GY) waters. N-2 fixation was detected at all 17 sampled stations with an average depth-integrated rate of 631 +/- 286 mu mol Nm(-2) d(-1) (range 196-1153 mu mol Nm(-2) d(-1)) in MA waters and of 85 +/- 79 mu mol Nm(-2) d(-1) (range 18-172 mu mol Nm(-2) d(-1)) in GY waters. Two cyanobacteria, the larger colonial filamentous Trichodesmium and the smaller UCYN-B, dominated the enumerated diazotroph community (>80 %) and gene expression of the nifH gene (cDNA > 10(5) nifH copies L-1) in MA waters. Single-cell isotopic analyses performed by nanoscale secondary ion mass spectrometry (nanoSIMS) at selected stations revealed that Trichodesmium was always the major contributor to N-2 fixation in MA waters, accounting for 47.1-83.8% of bulk N-2 fixation. The most plausible environmental factors explaining such exceptionally high rates of N-2 fixation in MA waters are discussed in detail, emphasizing the role of macro- and micro-nutrient (e.g., iron) availability, seawater temperature and currents.

Ort, förlag, år, upplaga, sidor
2018. Vol. 15, nr 13, s. 4215-4232
Nationell ämneskategori
Biologiska vetenskaper Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-159076DOI: 10.5194/bg-15-4215-2018ISI: 000438465800001OAI: oai:DiVA.org:su-159076DiVA, id: diva2:1241636
Tillgänglig från: 2018-08-24 Skapad: 2018-08-24 Senast uppdaterad: 2018-08-24Bibliografiskt granskad

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Av författaren/redaktören
Benavides, MarStenegren, MarcusFoster, Rachel Ann
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Institutionen för ekologi, miljö och botanik
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Biogeosciences
Biologiska vetenskaperGeovetenskap och miljövetenskap

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