Stable isotope ‘vital effects’ in coccolith calcite
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| Title: | Stable isotope ‘vital effects’ in coccolith calcite |
|---|---|
| Authors: | Ziveri, P.1 zivp@geo.vu.nl, Stoll, H.2 hstoll@williams.edu, Probert, I.3 billard@ibba.unicaen.fr, Klaas, C.4 cklaas@bgc-jena.mpg.de, Geisen, M.5 m.geisen@nhm.ac.uk, Ganssen, G.1, Young, J.5 jy@nhm.ac.uk |
| Source: | Earth & Planetary Science Letters. May2003, Vol. 210 Issue 1/2, p137. 13p. |
| Subjects: | Oxygen, Oceanography |
| Abstract: | Uncertainties about the origin of the many disequilibrium or ‘vital effects’ in a variety of calcifying organisms, and whether these effects are constant or variable, have hampered paleoceanographic application of carbon and oxygen isotopic ratios. Unraveling the source of these effects will improve paleoceanographic applications and may provide new information on changes in cell physiology and ecology. Culture of eight species of coccolithophorids, a dominant marine phytoplankton group, reveals a 5‰ array of disequilibrium or ‘vital effects’ in both the carbon and oxygen isotopic composition of coccolith calcite. In moderate light and nutrient-replete cultures, oxygen isotopic fractionation and carbon isotopic fractionation correlates directly with cell division rates and correlates inversely with cell size across a range of species. However, when growth rates of a single species are increased or decreased by higher or lower light levels, ∊18O is relatively invariant. Likewise, growth rate variations as a function of temperature do not influence coccolith ∊18O; the slope of the ∊18O vs. temperature relation in cultures of both Gephyrocapsa oceanica and Helicosphaera carteri is the same as for abiogenic carbonates. This suggests a constant, species-specific isotopic fractionation which does not vary with cell physiology. The constancy of vital effects suggests that coccolith stable isotopes will provide reliable phase for paleoceanographic reconstruction of temperature and seawater chemistry, as long as monospecific fractions are analyzed or changes in nannofossil assemblages are accounted for with species-specific correction factors. We suspect that the cell size, and its constraints on the rate of CO2 diffusion relative to C fixation, may be the first order influence on coccolith stable isotope vital effects. A quantitative model of this process may provide important constraints on mechanisms of carbon acquisition of coccolithophorids in both modern and extinct species. [Copyright &y& Elsevier] |
| Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 9711699 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Stable isotope ‘vital effects’ in coccolith calcite – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ziveri%2C+P%2E%22">Ziveri, P.</searchLink><relatesTo>1</relatesTo><i> zivp@geo.vu.nl</i><br /><searchLink fieldCode="AR" term="%22Stoll%2C+H%2E%22">Stoll, H.</searchLink><relatesTo>2</relatesTo><i> hstoll@williams.edu</i><br /><searchLink fieldCode="AR" term="%22Probert%2C+I%2E%22">Probert, I.</searchLink><relatesTo>3</relatesTo><i> billard@ibba.unicaen.fr</i><br /><searchLink fieldCode="AR" term="%22Klaas%2C+C%2E%22">Klaas, C.</searchLink><relatesTo>4</relatesTo><i> cklaas@bgc-jena.mpg.de</i><br /><searchLink fieldCode="AR" term="%22Geisen%2C+M%2E%22">Geisen, M.</searchLink><relatesTo>5</relatesTo><i> m.geisen@nhm.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Ganssen%2C+G%2E%22">Ganssen, G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Young%2C+J%2E%22">Young, J.</searchLink><relatesTo>5</relatesTo><i> jy@nhm.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. May2003, Vol. 210 Issue 1/2, p137. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Oxygen%22">Oxygen</searchLink><br /><searchLink fieldCode="DE" term="%22Oceanography%22">Oceanography</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Uncertainties about the origin of the many disequilibrium or ‘vital effects’ in a variety of calcifying organisms, and whether these effects are constant or variable, have hampered paleoceanographic application of carbon and oxygen isotopic ratios. Unraveling the source of these effects will improve paleoceanographic applications and may provide new information on changes in cell physiology and ecology. Culture of eight species of coccolithophorids, a dominant marine phytoplankton group, reveals a 5‰ array of disequilibrium or ‘vital effects’ in both the carbon and oxygen isotopic composition of coccolith calcite. In moderate light and nutrient-replete cultures, oxygen isotopic fractionation and carbon isotopic fractionation correlates directly with cell division rates and correlates inversely with cell size across a range of species. However, when growth rates of a single species are increased or decreased by higher or lower light levels, ∊18O is relatively invariant. Likewise, growth rate variations as a function of temperature do not influence coccolith ∊18O; the slope of the ∊18O vs. temperature relation in cultures of both Gephyrocapsa oceanica and Helicosphaera carteri is the same as for abiogenic carbonates. This suggests a constant, species-specific isotopic fractionation which does not vary with cell physiology. The constancy of vital effects suggests that coccolith stable isotopes will provide reliable phase for paleoceanographic reconstruction of temperature and seawater chemistry, as long as monospecific fractions are analyzed or changes in nannofossil assemblages are accounted for with species-specific correction factors. We suspect that the cell size, and its constraints on the rate of CO2 diffusion relative to C fixation, may be the first order influence on coccolith stable isotope vital effects. A quantitative model of this process may provide important constraints on mechanisms of carbon acquisition of coccolithophorids in both modern and extinct species. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S0012-821X(03)00101-8 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 137 Subjects: – SubjectFull: Oxygen Type: general – SubjectFull: Oceanography Type: general Titles: – TitleFull: Stable isotope ‘vital effects’ in coccolith calcite Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ziveri, P. – PersonEntity: Name: NameFull: Stoll, H. – PersonEntity: Name: NameFull: Probert, I. – PersonEntity: Name: NameFull: Klaas, C. – PersonEntity: Name: NameFull: Geisen, M. – PersonEntity: Name: NameFull: Ganssen, G. – PersonEntity: Name: NameFull: Young, J. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 05 Text: May2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 0012821X Numbering: – Type: volume Value: 210 – Type: issue Value: 1/2 Titles: – TitleFull: Earth & Planetary Science Letters Type: main |
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