Temperature Effects on Assimilation and Respiration in the Fontinalis duriaei-Periphyton Association

Abstract
F. duriaei Schimp. was collected from Coles Creek in Houghton County, Michigan [USA], to determine its assimilation and respiration under 5 temperature (1, 5, 10, 15, 20.degree. C) and 3 light (2400, 5400, 10,800 lx) conditions, using a Gilson differential respirometer. At 5400 lx the F. duriaei-periphyton association exhibited peak assimilation at 10.degree. C, where it approached light saturation under the experimental ccnditions. Adaptation to cool climates and spring and fall growth maxima are implicated.

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