Sangam: A Confluence of Knowledge Streams

Archaeal and bacterial assemblages in the Oxygen Minimum Zone of the upwelling ecosystem off Central Chile as determined by organic biomarkers

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dc.contributor Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
dc.contributor Sepulveda, Julio C
dc.contributor Summons, Roger E
dc.creator SRAIN, BENJAMÍN
dc.creator PANTOJA, SILVIO
dc.creator QUIÑONES, RENATO A
dc.creator LEVIPAN, HÉCTOR A
dc.creator Sepulveda, Julio C
dc.creator Summons, Roger E
dc.date 2018-05-09T17:44:22Z
dc.date 2018-05-09T17:44:22Z
dc.date 2015-06
dc.date 2018-05-09T16:53:04Z
dc.date.accessioned 2023-03-01T18:10:06Z
dc.date.available 2023-03-01T18:10:06Z
dc.identifier 0717-6538
dc.identifier http://hdl.handle.net/1721.1/115262
dc.identifier SRAIN, BENJAMÍN et al. “Archaeal and Bacterial Assemblages in the Oxygen Minimum Zone of the Upwelling Ecosystem Off Central Chile as Determined by Organic Biomarkers.” Gayana (Concepción) 79, 1 (June 2015): 26–44 © 2015 Universidad de Concepcion
dc.identifier https://orcid.org/0000-0002-7144-8537
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/279006
dc.description Organic biomarkers were used to investigate the infl uence of seasonal changes in oxygenation and water chemistry on the distribution of archaea and bacteria in the water column and surface sediments of the continental shelf off central Chile (ca. 36°S), an area infl uenced by seasonal upwelling and the development of an oxygen minimum zone. We were interested in establishing if occurrence of archaea and bacteria responds to oxygenation and water chemistry for which we analyzed archaeal isoprenoid (i) and bacterial branched (br) glycerol dialkyl glycerol tetraethers (GDGTs). Our results combined with molecular data from a year round observational program at the same sampling site and depths indicatives the occurrence and dominance of the marine pelagic group Thaumarchaeota. Changes in the distribution of iGDGTs might be explained by (i) the presence of archaeal populations in sub-oxic waters, phylogenetically different from those in surface water, (ii) changes in the relative contribution of Euryarchaeota with depth, and (iii) a relationship between Thaumarchaeota and environmental factors other than temperature. Branched GDGTs were more abundant in the upper, oxic layer during the non-upwelling season, may be a result of higher river runoff, whereas their diversity was higher within sub-oxic waters. Our results indicate a vertical segregation of iGDGTs and brGDGTs, with predominance of archaeal biomarkers during the low productivity season. KEYWORDS: Glycerol dialkyl glycerol tetraethers (GDGTs); archaea; bacteria; oxygen minimum zone; upwelling; Chile
dc.format application/pdf
dc.publisher SciELO Comision Nacional de Investigacion Cientifica Y Tecnologica (CONICYT)
dc.relation http://dx.doi.org/10.4067/S0717-65382015000100005
dc.relation Gayana (Concepción)
dc.rights Creative Commons Attribution 4.0 International License
dc.rights http://creativecommons.org/licenses/by/4.0/
dc.source SciELO
dc.title Archaeal and bacterial assemblages in the Oxygen Minimum Zone of the upwelling ecosystem off Central Chile as determined by organic biomarkers
dc.type Article
dc.type http://purl.org/eprint/type/JournalArticle


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