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dc.contributor.author
Xu, K.
dc.contributor.author
Gao, K.
dc.contributor.author
Villafañe, Virginia Estela
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dc.contributor.author
Helbling, Eduardo Walter
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dc.date.available
2019-09-12T23:27:19Z
dc.date.issued
2011-06
dc.identifier.citation
Xu, K.; Gao, K.; Villafañe, Virginia Estela; Helbling, Eduardo Walter; Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths; Copernicus Publications; Biogeosciences; 8; 6; 6-2011; 1441-1452
dc.identifier.issn
1726-4170
dc.identifier.uri
http://hdl.handle.net/11336/83493
dc.description.abstract
Changes in calcification of coccolithophores may affect their photosynthetic responses to both, ultraviolet radiation (UVR, 280-400 nm) and temperature. We operated semi-continuous cultures of Emiliania huxleyi (strain CS-369) at reduced (0.1 mM, LCa) and ambient (10 mM, HCa) Ca2+ concentrations and, after 148 generations, we exposed cells to six radiation treatments (>280, >295, >305, >320, >350 and >395 nm by using Schott filters) and two temperatures (20 and 25 °C) to examine photosynthesis and calcification responses. Overall, our study demonstrated that: (1) decreased calcification resulted in a down regulation of photoprotective mechanisms (i.e., as estimated via non-photochemical quenching, NPQ), pigments contents and photosynthetic carbon fixation; (2) calcification (C) and photosynthesis (P) (as well as their ratio) have different responses related to UVR with cells grown under the high Ca2+ concentration being more resistant to UVR than those grown under the low Ca2+ level; (3) elevated temperature increased photosynthesis and calcification of E. huxleyi grown at high Ca2+ concentrations whereas decreased both processes in low Ca2+ grown cells. Therefore, a decrease in calcification rates in E. huxleyi is expected to decrease photosynthesis rates, resulting in a negative feedback that further reduces calcification.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Copernicus Publications
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Temperature
dc.subject
Uvr
dc.subject
Coccoliths
dc.subject.classification
Biología Marina, Limnología
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-08-23T18:38:56Z
dc.identifier.eissn
1726-4189
dc.journal.volume
8
dc.journal.number
6
dc.journal.pagination
1441-1452
dc.journal.pais
Alemania
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dc.journal.ciudad
Gottingen
dc.description.fil
Fil: Xu, K.. Xiamen University; China
dc.description.fil
Fil: Gao, K.. Xiamen University; China
dc.description.fil
Fil: Villafañe, Virginia Estela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; Argentina
dc.description.fil
Fil: Helbling, Eduardo Walter. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; Argentina
dc.journal.title
Biogeosciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.biogeosciences.net/8/1441/2011/
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.5194/bg-8-1441-2011
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