The Perú-Chile undercurrent and the oxigen minimum zone variability off central Chile
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چکیده
منابع مشابه
Microbial eukaryote diversity in the marine oxygen minimum zone off northern Chile
Molecular surveys are revealing diverse eukaryotic assemblages in oxygen-limited ocean waters. These communities may play pivotal ecological roles through autotrophy, feeding, and a wide range of symbiotic associations with prokaryotes. We used 18S rRNA gene sequencing to provide the first snapshot of pelagic microeukaryotic community structure in two cellular size fractions (0.2-1.6 μm, >1.6 μ...
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The composition of ammonia-oxidizing bacteria from the beta-Proteobacteria subclass (betaAOB) was studied in the surface and upper-oxycline oxic waters (2- to 50-m depth, approximately 200 to 44 microM O(2)) and within the oxygen minimum zone (OMZ) suboxic waters (50- to 400-m depth, < or =10 microM O(2)) of the eastern South Pacific off northern Chile. This study was carried out through clonin...
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Nematodes are among the metazoans most tolerant of low-oxygen conditions and play major roles in seafloor ecosystem processes. Nematode communities were studied in sediments off Concepción, Central Chile, spanning the outer shelf within the OMZ (122 m) to the mid-lower continental slope (972 m) beneath the OMZ. The total density and biomass of nematodes (core depth 0–10 cm) ranged from 677 to 2...
متن کاملInter-annual variability of the Pelagic-Benthic coupling in the upwelling system off central Chile
The coastal region of central Chile (36 S) is one of the most productive coastal systems, characterized by a marked seasonality in the upwelling regime, that brings subsurface waters rich in nutrient and poor in oxygen (ESSW) into the euphotic zone. This oceanographic condition depends basically on the equatorward wind strength and is modified on different time scales, with the El Niño-Southern...
متن کاملInterdecadal changes in intensity of the oxygen minimum zone off Concepcion , Chile ( ~ 36 ° S ) , over the last century
We reconstructed oxygenation changes in the upwelling ecosystem off Concepción (36 S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and Cd were observed between ca. 1935 and 1971 CE, implying a prolonged period with predominantly more reduced conditions in bottom waters and surface se...
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ژورنال
عنوان ژورنال: Gayana (Concepción)
سال: 2006
ISSN: 0717-6538
DOI: 10.4067/s0717-65382006000300009