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P32 uptake and CO2 evolution by Oedogonium kurzii Zeller were compared in the laboratory in still and moving water. An “inherent current demand” by this lotic species was indicated a) by x10 increase in P32 uptake at current equivalents of 18 cm/sec; and b) by a 70% increase in respired CO2 in dark bottles at current equivalents of 15 cm/sec. In a current this demand is satisfied by the creation of a steep diffusion gradient.
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Whitford et al. (1961) studied this question.
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