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- W2125259117 abstract "We conducted 11 independent short-term carbon dioxide (CO2) manipulation experiments using colonies of the filamentous cyanobacteria Trichodesmium isolated on three cruises in the North Pacific Subtropical Gyre (NPSG). Dinitrogen (N2) and carbon (C) fixation rates of these colonies were compared over CO2 conditions ranging from ∼ 18 Pa (equivalent to last glacial maximum atmospheric ) to ∼ 160 Pa (predicted for ∼ year 2200). Our results indicate that elevated has no consistent significant effect on rates of N2 or C fixation by Trichodesmium colonies in the NPSG under present environmental conditions. Differences between treatments were not modulated by phosphorus amendments, iron amendments, or light level. Sequencing the hetR, nifH, 16S, and internal transcribed spacer genes of Trichodesmium colonies revealed a highly diverse community of Trichodesmium and other N2-fixing colony-associated organisms. The species composition of Trichodesmium demonstrated spatiotemporal variability, but over half of total sequences were phylogenetically closely related (> 99% hetR sequence similarity) to isolate H9-4 of T. erythraeum, which showed no response to elevated in previous laboratory experiments. Our handpicked Trichodesmium colonies included a substantial number of organisms other than Trichodesmium with the metabolic capacity for N2 and C fixation. We suggest that the diverse assemblage of Trichodesmium species and coexisting microorganisms within the colonies can explain the lack of an observed CO2 enhancement of N2 or C fixation rates, because different species are known to have different specific affinities for CO2." @default.
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- W2125259117 date "2014-04-07" @default.
- W2125259117 modified "2023-10-03" @default.
- W2125259117 title "Diversity trumps acidification: Lack of evidence for carbon dioxide enhancement of <i>Trichodesmium</i> community nitrogen or carbon fixation at Station ALOHA" @default.
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- W2125259117 doi "https://doi.org/10.4319/lo.2014.59.3.0645" @default.
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