Abundances and morphotypes of the coccolithophore Emiliania huxleyi in southern Patagonia compared to neighbouring oceans and Northern Hemisphere fjords

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dc.contributor.authorDiaz Rosas, Francisco
dc.contributor.authorAlves de Souza, Catharina
dc.contributor.authorAlarcon, Emilio
dc.contributor.authorMenschel, Eduardo
dc.contributor.authorGonzalez, Humberto E.
dc.contributor.authorTorres, Rodrigo
dc.contributor.authorvon Dassow, Peter
dc.date.accessioned2024-01-10T12:37:03Z
dc.date.available2024-01-10T12:37:03Z
dc.date.issued2021
dc.description.abstractCoccolithophores are potentially affected by ongoing ocean acidification, where rising CO2 lowers seawater pH and calcite saturation state (omega(cal)). Southern Patagonian fjords and channels provide natural laboratories for studying these issues due to high variability in physical and chemical conditions. We surveyed coccolithophore assemblages in Patagonian fjords during late spring 2015 and early spring 2017. Surface omega(cal) exhibited large variations driven mostly by freshwater inputs. High-omega cal conditions (max. 3.6) occurred in the Archipelago Madre de Dios. omega(cal) ranged from 2.0-2.6 in the western Strait of Magellan and 1.5-2.2 in the inner channel and was subsaturating (0.5) in Skyring Sound. Emiliania huxleyi was the only coccolithophore widely distributed in Patagonian fjords (> 96 % of total coccolithophores), only disappearing in the Skyring Sound, a semi-closed mesohaline system. Correspondence analysis associated higher E. huxleyi biomasses with lower diatom biomasses. The highest E. huxleyi abundances in Patagonia were in the lower range of those reported in Norwegian fjords. Predominant morphotypes were distinct from those previously documented in nearby oceans but similar to those of Norwegian fjords. Moderately calcified forms of E. huxleyi A morphotype were uniformly distributed throughout Patagonia fjords. The exceptional R/hyper-calcified coccoliths, associated with low omega(cal) values in Chilean and Peruvian coastal upwellings, were a minor component associated with high omega(cal) levels in Patagonia. Outlying mean index (OMI) niche analysis suggested that pH and omega(cal) conditions explained most variation in the realized niches of E. huxleyi morphotypes. The moderately calcified A morphotype exhibited the widest niche breadth (generalist), while the R/hyper-calcified morphotype exhibited a more restricted realized niche (specialist). Nevertheless, when considering an expanded sampling domain, including nearby southeast Pacific coastal and offshore waters, even the R/hyper-calcified morphotype exhibited a higher niche breadth than other closely phylogenetically related coccolithophore species. The occurrence of E. huxleyi in naturally low pH-omega(cal) environments indicates that its ecological response is plastic and capable of adaptation.
dc.description.funderAgencia Nacional de Investigacion y Desarrollo
dc.description.funderdoctoral fellowship CONICYTPCHA/Doctorado Nacional
dc.description.funderIniciativa Cientifica Milenio through the Instituto Milenio de Oceanografia de Chile
dc.description.funderCentro de Investigacion: Dinamica de Ecosistemas Marinos de Altas Latitudes de Chile
dc.description.fundergrant FONDEQUIP
dc.format.extent25 páginas
dc.fuente.origenWOS
dc.identifier.doi10.5194/bg-18-5465-2021
dc.identifier.eissn1726-4189
dc.identifier.issn1726-4170
dc.identifier.urihttps://doi.org/10.5194/bg-18-5465-2021
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76736
dc.identifier.wosidWOS:000706297500001
dc.information.autorucFacultad de Ciencias Biológicas; Von Dassow No Informado, Peter; S/I; 1009321
dc.issue.numero19
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final5489
dc.pagina.inicio5465
dc.publisherCOPERNICUS GESELLSCHAFT MBH
dc.revistaBIOGEOSCIENCES
dc.rightsregistro bibliográfico
dc.subjectCARBONATE CHEMISTRY
dc.subjectUPWELLING SYSTEM
dc.subjectLIVING COMMUNITIES
dc.subjectCACO3 SATURATION
dc.subjectWESTERN NORWAY
dc.subjectPHYTOPLANKTON
dc.subjectACIDIFICATION
dc.subjectSEAWATER
dc.subjectDIATOMS
dc.subjectCO2
dc.subject.ods14 Life Below Water
dc.subject.ods13 Climate Action
dc.subject.odspa14 Vida submarina
dc.subject.odspa13 Acción por el clima
dc.titleAbundances and morphotypes of the coccolithophore Emiliania huxleyi in southern Patagonia compared to neighbouring oceans and Northern Hemisphere fjords
dc.typeartículo
dc.volumen18
sipa.codpersvinculados1009321
sipa.indexWOS
sipa.trazabilidadCarga SIPA;09-01-2024
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