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Calcareous benthic foraminifera from the upper central peruvian margin: Control of the assemblage by pore water redox and sedimentary organic matter

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dc.contributor.author Cardich Salazar, Jorge Aquiles
dc.contributor.author Gutierrez Aguilar, Dimitri Alexey
dc.contributor.author Romero, D.
dc.contributor.author Perez Segovia, Alexander
dc.contributor.author Quipúzcoa, L.
dc.contributor.author Marquina, R.
dc.contributor.author Yupanqui, W.
dc.contributor.author Solís, J.
dc.contributor.author Carhuapoma, W.
dc.contributor.author Sifeddine, A.
dc.contributor.author Rathburn, A.
dc.date.accessioned 2019-02-22T14:54:03Z
dc.date.available 2019-02-22T14:54:03Z
dc.date.issued 2015
dc.identifier.uri https://hdl.handle.net/20.500.12866/5608
dc.description.abstract We studied 'living' (stained) benthic foraminifera in the upper border of the Peruvian oxygen minimum zone (OMZ) to determine the relationship between species' distribution and pore water and sediment geochemistry under oxygen deficiency. Superficial sediments were sampled between 2009 and 2011 from 2 bathymetric transects off central Peru (45 to 300 m depth). The quantity (total organic carbon, total nitrogen and chloroplastic pigment equivalents [CPE]) and quality (chlorophyll a/phaeopigments ratio) of organic matter (OM) were evaluated. Benthic foraminifera were sampled in the top 5 cm of sediment. Commonly, the inner shelf sediments were sulfidic and labile OM-rich, whereas the outer shelf and upper slope sediments exhibited postoxic conditions (e.g. anoxic and non-sulfidic) with less labile OM, typical of OMZ core sediments. Mixed conditions were found in shelf sediment samples from April 2010, when the effects of El Niño 2009/2010 were withdrawing. Foraminiferal assemblages exhibited differences according to redox conditions and OM quality, and were concentrated in the topmost sediment. A canonical correspondence analysis and non-parametric correlations indicated that Bolivina costata, Nonionella auris and Virgulinella fragilis were characteristic of sulfidic/labile OM sediments, thriving slightly deeper in the sediment. In contrast, Bolivina pacifica headed the assemblage representative of postoxia/less labile OM. Bolivina seminuda and Buliminella tenuata (both dominant under postoxia) were not associated with any specific measured parameter, although were present in sulfidic sediments, suggesting other factors were involved in their distribution. en_US
dc.language.iso eng
dc.publisher Inter Research
dc.relation.ispartofseries Marine Ecology. Progress Series
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Peru en_US
dc.subject organic matter en_US
dc.subject sediment chemistry en_US
dc.subject Anoxia en_US
dc.subject redox conditions en_US
dc.subject benthic foraminifera en_US
dc.subject Benthic foraminifera en_US
dc.subject Bolivina costata en_US
dc.subject Bolivina pacifica en_US
dc.subject Bolivina seminuda en_US
dc.subject Buliminella tenuata en_US
dc.subject correspondence analysis en_US
dc.subject Foraminifera en_US
dc.subject hydrogeochemistry en_US
dc.subject Labile organic matter en_US
dc.subject Nonionella auris en_US
dc.subject oxygen minimum layer en_US
dc.subject porewater en_US
dc.subject shelf sediment en_US
dc.subject slope dynamics en_US
dc.subject sulfide en_US
dc.subject Sulfide en_US
dc.subject Virgulinella fragilis en_US
dc.title Calcareous benthic foraminifera from the upper central peruvian margin: Control of the assemblage by pore water redox and sedimentary organic matter en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.3354/meps11409
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#4.01.08
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.11
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.06.13
dc.relation.issn 1616-1599

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