Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii

Mg / Ca ratios in foraminiferal tests are routinely used as paleotemperature proxies, but on long timescales, they also hold the potential to reconstruct past seawater Mg / Ca. The impact of both temperature and seawater Mg / Ca on Mg incorporation in Foraminifera has been quantified by a number of...

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Autores: Mewes, Antje, Langer, Gerald|||0000-0002-7211-4889, Thoms, Silke, Nehrke, Gernot|||0000-0002-2851-3049, Reichart, Gert-Jan|||0000-0002-7256-2243, De Nooijer, Lennart Jan, Bijma, Jelle|||0000-0003-4371-1438
Tipo de recurso: artículo
Fecha de publicación:2015
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:293558
Acceso en línea:https://ddd.uab.cat/record/293558
https://dx.doi.org/urn:doi:10.5194/bg-12-2153-2015
Access Level:acceso abierto
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spelling Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessoniiMewes, AntjeLanger, Gerald|||0000-0002-7211-4889Thoms, SilkeNehrke, Gernot|||0000-0002-2851-3049Reichart, Gert-Jan|||0000-0002-7256-2243De Nooijer, Lennart JanBijma, Jelle|||0000-0003-4371-1438Mg / Ca ratios in foraminiferal tests are routinely used as paleotemperature proxies, but on long timescales, they also hold the potential to reconstruct past seawater Mg / Ca. The impact of both temperature and seawater Mg / Ca on Mg incorporation in Foraminifera has been quantified by a number of studies. The underlying mechanism responsible for Mg incorporation in foraminiferal calcite and its sensitivity to environmental conditions, however, has not been fully identified. A recently published biomineralization model (Nehrke et al., 2013) proposes a combination of transmembrane transport and seawater leakage or vacuolization to link calcite Mg / Ca to seawater Mg / Ca and explains inter-species variability in Mg / Ca ratios. To test the assumptions of this model, we conducted a culture study in which seawater Mg / Ca was manipulated by varying [Ca2+] and keeping [Mg2+] constant. Foraminiferal growth rates, test thickness and calcite Mg / Ca of newly formed chambers were analyzed. Results showed optimum growth rates and test thickness at Mg / Ca closest to that of ambient seawater. Calcite Mg / Ca is positively correlated to seawater Mg / Ca, indicating that it is not absolute seawater [Ca2+] and [Mg2+] but their ratio that controls Mg / Ca in tests. These results demonstrate that the calcification process cannot be based only on seawater vacuolization, supporting the mixing model proposed by Nehrke et al. (2013). Here, however, we suggest transmembrane transport fractionation that is not as strong as suggested by Nehrke et al. (2013). 22015-01-0120152015-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/293558https://dx.doi.org/urn:doi:10.5194/bg-12-2153-2015reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 267931open accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2935582026-06-06T12:50:31Z
dc.title.none.fl_str_mv Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
title Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
spellingShingle Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
Mewes, Antje
title_short Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
title_full Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
title_fullStr Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
title_full_unstemmed Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
title_sort Impact of seawater [Ca2+] on the calcification and calcite Mg / Ca of Amphistegina lessonii
dc.creator.none.fl_str_mv Mewes, Antje
Langer, Gerald|||0000-0002-7211-4889
Thoms, Silke
Nehrke, Gernot|||0000-0002-2851-3049
Reichart, Gert-Jan|||0000-0002-7256-2243
De Nooijer, Lennart Jan
Bijma, Jelle|||0000-0003-4371-1438
author Mewes, Antje
author_facet Mewes, Antje
Langer, Gerald|||0000-0002-7211-4889
Thoms, Silke
Nehrke, Gernot|||0000-0002-2851-3049
Reichart, Gert-Jan|||0000-0002-7256-2243
De Nooijer, Lennart Jan
Bijma, Jelle|||0000-0003-4371-1438
author_role author
author2 Langer, Gerald|||0000-0002-7211-4889
Thoms, Silke
Nehrke, Gernot|||0000-0002-2851-3049
Reichart, Gert-Jan|||0000-0002-7256-2243
De Nooijer, Lennart Jan
Bijma, Jelle|||0000-0003-4371-1438
author2_role author
author
author
author
author
author
description Mg / Ca ratios in foraminiferal tests are routinely used as paleotemperature proxies, but on long timescales, they also hold the potential to reconstruct past seawater Mg / Ca. The impact of both temperature and seawater Mg / Ca on Mg incorporation in Foraminifera has been quantified by a number of studies. The underlying mechanism responsible for Mg incorporation in foraminiferal calcite and its sensitivity to environmental conditions, however, has not been fully identified. A recently published biomineralization model (Nehrke et al., 2013) proposes a combination of transmembrane transport and seawater leakage or vacuolization to link calcite Mg / Ca to seawater Mg / Ca and explains inter-species variability in Mg / Ca ratios. To test the assumptions of this model, we conducted a culture study in which seawater Mg / Ca was manipulated by varying [Ca2+] and keeping [Mg2+] constant. Foraminiferal growth rates, test thickness and calcite Mg / Ca of newly formed chambers were analyzed. Results showed optimum growth rates and test thickness at Mg / Ca closest to that of ambient seawater. Calcite Mg / Ca is positively correlated to seawater Mg / Ca, indicating that it is not absolute seawater [Ca2+] and [Mg2+] but their ratio that controls Mg / Ca in tests. These results demonstrate that the calcification process cannot be based only on seawater vacuolization, supporting the mixing model proposed by Nehrke et al. (2013). Here, however, we suggest transmembrane transport fractionation that is not as strong as suggested by Nehrke et al. (2013).
publishDate 2015
dc.date.none.fl_str_mv 2
2015-01-01
2015
2015-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/293558
https://dx.doi.org/urn:doi:10.5194/bg-12-2153-2015
url https://ddd.uab.cat/record/293558
https://dx.doi.org/urn:doi:10.5194/bg-12-2153-2015
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 267931
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
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repository.mail.fl_str_mv
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