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The influence of symbiont photosynthesis on the boron isotopic composition of foraminifera shells

Record type: Article

Culture experiments were carried out with the planktonic foraminifer Orbulina universa under high and low light levels in order to determine the influence of symbiont photosynthetic activity on the boron isotopic composition of shell calcite. Under low light (reduced photosynthetic rates) the boron isotopic composition of the tests is 1.5[permil] lower compared to shells grown under high light (elevated photosynthetic rates). In terms of inferred pH, the lower boron isotope values correspond to a reduction in pH of approximately 0.2 units. The boron isotopic composition of Orbulina universa from plankton tows is similar to that of shells grown under low light conditions in the laboratory. These data are consistent with reduced symbiont concentrations in recently secreted shells. In addition to laboratory and field grown O. universa, we present the first data for a symbiont-barren foraminifer, Globigerina bulloides. Data obtained for G. bulloides fall ~1.4[permil] below those of the field grown O. universa. Although the plankton tow results are preliminary, they support the hypothesis that respiration and photosynthesis are the key physiological parameters responsible for species-specific vital effects

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Citation

Honisch, B., Bijma, J., Russell, A.D., Spero, H.J., Palmer, M.R., Zeebe, R.E. and Eisenhauer, A. (2003) The influence of symbiont photosynthesis on the boron isotopic composition of foraminifera shells Marine Micropaleontology, 49, (1-2), pp. 87-96. (doi:10.1016/S0377-8398(03)00030-6).

More information

Published date: 2003
Keywords: planktonic foraminifera, vital effects, symbionts, paleo-pH

Identifiers

Local EPrints ID: 2070
URI: http://eprints.soton.ac.uk/id/eprint/2070
ISSN: 0377-8398
PURE UUID: e52a2ded-56c4-4c4e-8e58-f4a871fcb453

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Date deposited: 11 May 2004
Last modified: 17 Jul 2017 17:16

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Contributors

Author: B. Honisch
Author: J. Bijma
Author: A.D. Russell
Author: H.J. Spero
Author: M.R. Palmer
Author: R.E. Zeebe
Author: A. Eisenhauer

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