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Diversity and dynamics of rare and of resident bacterial populations in coastal sands ArchiMer
Gobet, Angelique; Boeer, Simone I.; Huse, Susan M.; Van Beusekom, Justus E. E.; Quince, Christopher; Sogin, Mitchell L.; Boetius, Antje; Ramette, Alban.
Coastal sands filter and accumulate organic and inorganic materials from the terrestrial and marine environment, and thus provide a high diversity of microbial niches. Sands of temperate climate zones represent a temporally and spatially highly dynamic marine environment characterized by strong physical mixing and seasonal variation. Yet little is known about the temporal fluctuations of resident and rare members of bacterial communities in this environment. By combining community fingerprinting via pyrosequencing of ribosomal genes with the characterization of multiple environmental parameters, we disentangled the effects of seasonality, environmental heterogeneity, sediment depth and biogeochemical gradients on the fluctuations of bacterial communities...
Tipo: Text Palavras-chave: 454 pyrosequencing; Coastal seas; Bacterial diversity; Multivariate analysis; Rare biosphere.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00488/59947/63192.pdf
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The Spatiotemporal Dynamics of the Sources and Sinks of CO2 in the Global Coastal Ocean ArchiMer
Roobaert, Alizee; Laruelle, Goulven G.; Landschuetzer, Peter; Gruber, Nicolas; Chou, Lei; Regnier, Pierre.
In contrast to the open ocean, the sources and sinks for atmospheric carbon dioxide (CO2) in the coastal seas are poorly constrained and understood. Here we address this knowledge gap by analyzing the spatial and temporal variability of the coastal air-sea flux of CO2 (FCO2) using a recent high-resolution (0.25 degrees) monthly climatology for coastal sea surface partial pressure in CO2 (pCO(2)). Coastal regions are characterized by CO2 sinks at temperate and high latitudes and by CO2 sources at low latitude and in the tropics, with annual mean CO2 flux densities comparable in magnitude and pattern to those of the adjacent open ocean with the exception of river-dominated systems. The seasonal variations in FCO2 are large, often exceeding 2 mol C m(-2)...
Tipo: Text Palavras-chave: Coastal seas; Air-sea CO2 exchange; Seasonality; Ocean carbon cycle; Continental shelves.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00676/78795/81027.pdf
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