| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
A reappraisal of the vital effect in cultured benthic foraminifer Bulimina marginata on Mg/Ca values: assessing temperature uncertainty relationships
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| Autores: |
Wit, J. C.
De Nooijer, L. J.
Barras, C.
Jorissen, F. J.
Reichart, G. J.
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| Data: |
2012
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| Ano: |
2012
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| Resumo: |
The reconstruction of past temperatures is often achieved through measuring the Mg/Ca value of foraminiferal test carbonate. The diversity in foraminiferal Mg/Ca-temperature calibrations suggests that there is also a biological control on this proxy. This study presents a new Mg/Ca-temperature calibration for the benthic foraminifer Bulimina marginata, based on cultures under a range of temperatures (4-14 degrees C). Measured Mg/Ca values for B. marginata correlate with temperature (Mg/Ca = (1.10+/-0.10) e((0.045+/-0.009)) T, R-2 = 0.28 p < 0.01). The inter-individual variability is, however, also significant (standard deviation is 10-35% of the average). Before applying this or any calibration, the effect of the inter-individual variability on the accuracy of the Mg/Ca-temperature calibration has to be evaluated. The inter-individual variability is quantified and split into three components, namely (1) an analytical error, (2) an environmental effect and (3) a vital effect. The effect of inter-individual variability on the accuracy of Mg/Ca-temperature calibrations depends on the sensitivity of the calibration used and the number of individuals measured (temperature uncertainty = (0.33 . N-0.50)/sensitivity). The less sensitive a calibration, the greater is the impact of inter-individual variability, which can partly be circumvented by measuring more individuals. This study shows the link between inter-individual variability and sensitivity and quantifies their influence on the accuracy of Mg/Ca-temperature calibrations. Differences in the sensitivity of the Mg/Ca-temperature calibration of foraminifera may depend on the environmental conditions in which foraminifera live and their concurring ecological strategies.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00249/36045/34589.pdf
DOI:10.5194/bg-9-3693-2012
https://archimer.ifremer.fr/doc/00249/36045/
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| Editor: |
Copernicus Gesellschaft Mbh
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| Formato: |
application/pdf
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| Fonte: |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2012 , Vol. 9 , N. 9 , P. 3693-3704
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| Direitos: |
Author(s) 2012. CC Attribution 3.0 License.
info:eu-repo/semantics/openAccess
restricted use
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