Field experiments for in situ measurement of photosynthetic efficiency and quantum yield

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Abstract
A method for the in situ determination of .hivin.kc, the average in vitro spectral specific attenuation coefficient of chlorophyll is described. This method takes into account changes in the spectral distribution of underwater light throughout the water column using a commonly available cosine collector. The .hivin.kc values, together with irradiance and primary productivity data from Lake Constance, Europe, are used to calculate photosynthetic efficiencies Ez and quantum yields .phi. at different depths. The depth related changes found in .phi. and .hivin.kc are discussed, as is the question of constancy of .phi.max at low irradiance levels.

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