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We investigated expression of genes mediating elemental cycling at the microspatial scale in the ocean's largest river plume using, to our knowledge, the first fully quantitative inventory of genes and transcripts. The bacterial and archaeal communities associated with a phytoplankton bloom in Amazon River Plume waters at the outer continental shelf in June(More)
a r t i c l e i n f o The fresh Amazon/Orinoco plume covers in excess of 10 6 km 2 in late summer–early fall forming a near-surface barrier layer that reduces exchange with the cooler, saltier water below. Barrier layers and higher water turbidity keep SST in the region high and thus are factors in the development of fall season hurricanes. Year to year(More)
[1] In this paper we use a biological-physical model with an explicit representation of Trichodesmium to examine the influence of N 2 fixation in the Atlantic. Three solutions are examined, one where the N 2 fixation rate has been set to observed levels, one where the rate has been increased to levels comparable to geochemical estimates, and one with no N 2(More)
In this paper we examine time-series measurements of near-surface chlorophyll concentration from a mooring that was deployed at 80.5 • E on the equator in the Indian Ocean in 2010. These data reveal at least six striking spikes in chlorophyll from October through December, at approximately 2-week intervals, that coincide with the development of the fall(More)
1 As part of the multidisciplinary ANACONDAS program, we characterized the distributions of 2 nutrients, particulate organic matter, phytoplankton, and stable carbon and nitrogen isotopes in 3 the Amazon plume region during the spring high-flow period of May-June 2010. We 4 encountered the lowest salinities (16.6 psu) near the southern end of our study(More)
The Amazon River has the largest discharge of all rivers on Earth, and its complex plume system fuels a wide array of biogeochemical processes, across a large area of the western tropical North Atlantic. The plume thus stimulates microbial processes affecting carbon sequestration and nutrient cycles at a global scale. Chromosomal gene expression patterns of(More)
Spatial and temporal patterns in microbial biodiversity across the Amazon river-ocean continuum were investigated along ∼675 km of the lower Amazon River mainstem, in the Tapajós River tributary, and in the plume and coastal ocean during low and high river discharge using amplicon sequencing of 16S rRNA genes in whole water and size-fractionated samples(More)
Metatranscriptomics and metagenomics data sets benchmarked with internal standards were used to characterize the expression patterns for biogeochemically relevant bacterial and archaeal genes mediating carbon, nitrogen, phosphorus and sulfur uptake and metabolism through the salinity gradient of the Amazon River Plume. The genes were identified in 48(More)