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Figure 9.6. Result of a primary production versus irra-diance measurement for the tidal-freshwater Hudson River. The Y-axis shows primary production measured as the assimilation of 14C-HCO3 into organic matter as a function of light (X-axis). In this example the organic matter includes both particulate and dissolved components (POC plus DOC). The actual data points, with SE, are shown as open circles and the line represents the fit hyperbolic tangent function fit to these data. The photosynthetic parameters (Pmax, a, and Ik) are derived from the equation for the fitted line (see text). These data are for Hudson, New York, on September 12,1998.

0 200 400 600 800 1000 1200 Light QxEinst m"2s_1)

Figure 9.6. Result of a primary production versus irra-diance measurement for the tidal-freshwater Hudson River. The Y-axis shows primary production measured as the assimilation of 14C-HCO3 into organic matter as a function of light (X-axis). In this example the organic matter includes both particulate and dissolved components (POC plus DOC). The actual data points, with SE, are shown as open circles and the line represents the fit hyperbolic tangent function fit to these data. The photosynthetic parameters (Pmax, a, and Ik) are derived from the equation for the fitted line (see text). These data are for Hudson, New York, on September 12,1998.

vary, as we have seen with season, flow, temperature, and the species shift induced by the zebra mussel invasion (Cole et al., 1992; Caraco et al., 1997; Caraco et al., 2000). We can put these pieces together andlook at phytoplankton primary production.

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