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Reevaluating the Generality of an Empirical Model for Light-Limited Primary Production in the San Francisco Estuary

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Abstract

Depth-integrated primary production (ΣP, in grams of carbon per square meter per day) was measured using 14C in the northern San Francisco Estuary (SFE) from March through August of 2006 and 2007. Determinations of ΣP were then used to calibrate a published light-utilization model that relates ΣP to a composite parameter of chlorophyll, solar irradiance, and photic zone depth. The resultant calibration coefficient, Ψ, varied by a factor of nearly two between 2006 and 2007 and was lower than determined in previous calibrations for the estuary. The now chronically low chlorophyll concentrations in the SFE have resulted in lower predictive power of the light-utilization model. The variation in Ψ was likely the result of interannual variation in phytoplankton assimilation number. These results suggest that using a single Ψ may yield large errors in estimated estuarine production when applied overbroad spatial and temporal scales. Given the food-limited condition of the SFE, it appears that direct measurements of primary production are necessary for accurately characterizing the base of the estuarine food web.

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Acknowledgments

We thank E. Carpenter, A. Gould, T. Ignoffo, A. Slaughter, J. Tirindelli, and J. York for assistance in the field and the laboratory and the captain and crew of the R/V Questuary for logistical support. We also thank B. Cole and J. Cloern for access to their original data. F. Wilkerson and M. Weaver provided helpful comments on an earlier draft of this manuscript. Funding was provided by the CALFED Bay-Delta Science Program (grant SCI-05-C107).

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Correspondence to Alexander E. Parker.

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Parker, A.E., Kimmerer, W.J. & Lidström, U.U. Reevaluating the Generality of an Empirical Model for Light-Limited Primary Production in the San Francisco Estuary. Estuaries and Coasts 35, 930–942 (2012). https://doi.org/10.1007/s12237-012-9507-x

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