Hi

I'm trying to apply models that better fir my PE data, that is, oxygen production vs irradiance. I have been using phytotools package and I notice that all models available in this package (Plat et al., 1980, webb et al., 1974, Jassby & Platt 1976) converge the model start to zero, to the origin. This would assume a zero oxygen consumption at zero radiance, but we know thats not the case, the algae or plant consumes oxygen when in the dark. What am I missing here? Is this detail irrelevant for the model taht will give us the Pmax, alpha and so on?

Thank you.

Cheers, Luís Pereira.

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