Nitrogen isotope dynamics of the Cariaco Basin, Venezuela
نویسندگان
چکیده
منابع مشابه
Biogenic nitrogen gas production at the oxic–anoxic interface in the Cariaco Basin, Venezuela
Excess nitrogen gas (Nxs 2 ) was measured in samples collected at six locations in the eastern and western sub-basins of the Cariaco Basin, Venezuela, in September 2008 (non-upwelling conditions) and March 2009 (upwelling conditions). During both sampling periods, Nxs 2 concentrations were below detection in surface waters, increasing to ∼ 22 μmol N kg−1 at the oxic–anoxic interface ([O2]<∼ 4 μ...
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Distributions of bacterial populations in the anoxic Cariaco Basin were studied over 2 yr (five cruises) at three stations using fluorescence in situ hybridization (FISH) and terminal restriction fragment length polymorphism (T-RFLP) of 16S ribosomal ribonucleic acid (rRNA) genes. FISH results demonstrate that the contribution of eproteobacterial abundances to total prokaryotic inventories was ...
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متن کامل
The importance of subsurface nepheloid layers in transport and delivery of sediments to the eastern Cariaco Basin, Venezuela
Optical transmissometer measurements were coupled with particulate organic matter (POM) observations to understand suspended sediment composition and distribution in the eastern Cariaco Basin during the rainy seasons of September 2003 and 2006. Our results suggest that nepheloid layers originating at the mouth of small mountainous rivers discharging into the eastern Basin are a major delivery m...
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Qualitative expression of dissimilative sulfite reductase (dsrA), a key gene in sulfate reduction, and sulfide:quinone oxidoreductase (sqr), a key gene in sulfide oxidation was investigated. Neither of the two could be amplified from mRNA retrieved with Niskin bottles but were amplified from mRNA retrieved by the Deep SID. The sqr and sqr-like genes retrieved from the Cariaco Basin were related...
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ژورنال
عنوان ژورنال: Global Biogeochemical Cycles
سال: 2004
ISSN: 0886-6236
DOI: 10.1029/2003gb002185