Carbon assimilation by the picoplanktonic community inhabiting the secondary chlorophyll maximum of the anoxic marine zones of the eastern tropical north and south pacific

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dc.article.number858308
dc.contributor.authorAldunate, Montserrat
dc.contributor.authorVon Dassow, Peter
dc.contributor.authorVargas, Cristian A.
dc.contributor.authorUlloa, Osvaldo
dc.date.accessioned2022-12-06T20:16:12Z
dc.date.available2022-12-06T20:16:12Z
dc.date.issued2022
dc.description.abstractAnoxic marine zones (AMZs) constitute pelagic systems distinguished from the oxygen minimum zones (OMZs) by the complete absence of detectable oxygen and the accumulation of nitrite in mid-waters. At the top of the oxygen-depleted layer and below the oxycline, nutrients are abundant; light intensity is very much reduced (<1% of incident light) and a secondary chlorophyll maximum (SCM) is developed. The shoaling of the oxygen-depleted layer, product of the AMZ expansion, could enhance this SCM, which has little-known biogeochemical effects. Here, we show that the SCM is contributing a measurable signal in the particulate organic carbon (POC), enough to alter the δ13CPOC in the top of the oxygen-depleted layer. This data showed significant differences among stations with and without the development of a SCM, being 3.0‰ heavier when a SCM is developed, and indicating photosynthetic activity and/or remineralization in the top of the AMZ. More depleted δ13CPOC values were also found when no SCM was present indicating stronger chemoautotrophic activity, potentially driven by anammox and sulfur-oxidizing bacteria activity. Assimilation rate data show that when sufficient light and Prochlorococcus are present, photosynthesis exceeds chemoautotrophic carbon fixation, and can exceed heterotrophic assimilation of glucose or acetate. However, in the majority of the stations, assimilation rates of both glucose and acetate exceeded carbon fixation rates under light stimulation, suggesting that often the SCM is still a net heterotrophic system
dc.format.extent14 páginas
dc.fuente.origenSIPA
dc.identifier.doi10.3389/fmars.2022.858308
dc.identifier.eissn2296-7745
dc.identifier.issn2296-7745
dc.identifier.urihttps://doi.org/10.3389/fmars.2022.858308
dc.identifier.urihttps://www.frontiersin.org/articles/10.3389/fmars.2022.858308/full
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/65861
dc.identifier.wosidWOS:000806312900001
dc.information.autorucFacultad de ciencias biológicas ; Van Dassow, Peter ; 0000-0002-1858-1953 ; 1009321
dc.language.isoen
dc.nota.accesoContenido completo
dc.publisherFRONTIERS MEDIA SA
dc.revistaFrontiers in Marine Science
dc.rightsacceso abierto
dc.subjectAutotrophy
dc.subjectSecondary chlorophyll maximum
dc.subjectOxygen minimum zones
dc.subjectAnoxia
dc.subjectProchlorococcus
dc.subjectHeterotrophy
dc.subject.ods14 Life Below Water
dc.subject.ods13 Climate Action
dc.subject.odspa14 Vida submarina
dc.subject.odspa13 Acción por el clima
dc.titleCarbon assimilation by the picoplanktonic community inhabiting the secondary chlorophyll maximum of the anoxic marine zones of the eastern tropical north and south pacific
dc.typeartículo
dc.volumen9
sipa.codpersvinculados1009321
sipa.indexWOS
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