The maximum quantum yield of phylopiankton photosynthesis in situ |
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Authors: | Bannister, T.T. Weidemann, A.D. |
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Affiliation: | Department of Biology, University of Rochester Rochester, NY 14627, USA |
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Abstract: | Light-limited photosynthetic carbon incorportion is expectedto be directly proportional to the scalar quantum irradiance.The proportionality constant is , where mis the maximum quantum yield (mol C Einstein1 absorbed)and $$stackrel{¯}{{hbox{ k }}_{hbox{ c }}}$$ isthe mean spectral absorption coefficient (m2 mg1 chla). Recent efforts to evaluate of in situphytoplankton photosynthesis are variously flawed. Lack of evidenceof proportionality and lack of correction of cosine to scalarirradiance are common deficiencies. Most data, as we interpretthem, indicate values in the range 0.0003 0.0006 mol C m2 Einstein1 abs mg1 chl a. New determinationsin lrondequoit Bay, New York, lie in this range. Most estimatesof at depth have been about 0.010 m2 mg1chl a. Similar values are being obtained for total particulatesfrom lrondequoit Bay; whether detritus contributes significantlyis not yet known. Published data, in our view, all point tovalues of m in situ in the range 0.030.07 mol C Einstein1abs. Published values >0.10 are almost certainly due to imprecisionor systematic error. *This paper is the result of a study made at the Group for AquaticPrimary Productivity (GAP) First International Workshop heldat the Limnological Institute, University of Konstanz, in April1982. |
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