Dependence of phytoplankton carbon isotopic composition on growth rate and [CO 2 ) aq : Theoretical considerations and experimental results

Details Dependence of phytoplankton carbon isotopic composition on growth rate and [CO 2 ) aq : Theoretical considerations and experimental results Dependence of phytoplankton carbon isotopic composition on growth rate and [CO 2 ) aq : Theoretical considerations and experimental results

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.1131l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 6, pp.1131-1138

Mathematics

Logic

72

Scientific paper

The carbon isotopic composition of the marine diatom Phaeodactylum tricornutum ( 13 C p ) was measured over a series of growth rates ( ) in a continuous culture system in which both 13 3C CO 2 and [CO 2 ] aq were determined. In accord with theory, a linear relationship was found to exist between / [CO 2 ] aq and p ( 1000( 13 C CO 2 - 13 C p )/1000 + d 13 C p ), the biological fractionation associated with carbon fixation. The range of [CO 2 ] aq in the continuous culture system was 13-31 mol kg -1 . Measurements of 13 C CO 2 and [CO 2 ] aq in the mixed layer of the equatorial Pacific and estimates of 13 C p obtained from the 13 C of chlorophyll a combined with the regression line fit to the P. tricornutum data give phytoplankton growth rates that are in excellent agreement with those estimated via other techniques. Measurement of p and [CO 2 ] aq in the field can provide an estimate of in situ phytoplankton growth rates without the potential artifacts associated with incubation methodologies. These findings also suggest that accurate estimations of ancient CO 2 (aq) concentrations will require knowledge of both p and phytoplankton growth rate.

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