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

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

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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‰ 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‰ 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.

Document Type: Article
Keywords: N11B; planktonic foraminifera; vital e¡ects; symbionts ; paleo-pH
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1016/S0377-8398(03)00030-6
ISSN: 0377-8398
Date Deposited: 18 Feb 2008 17:26
Last Modified: 21 Jun 2017 12:59

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