Cold and Warm-Adapted Phases in Fontinalis duriaei Schimp. as Evidenced by Net Assimilatory and Respiratory Responses to Temperature

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Department of Biological Sciences


Fontinalis duriaei Schimp. samples were collected from Big Valley Creek (Houghton Co., Michigan 47°N, 88° 40′W) at 8-week intervals starting 27 November 1976 and ending 3 December 1977. Net assimilation and respiration were measured with a Gilson differential respirometer over a temperature range of 0.5-40°C.

Rates of net assimilation and respiration of Fontinalis duriaei were modelled using the Arrhenius equation to demonstrate the effects of acclimation to temperature. Net assimilation could be divided into two distinct groups: cold response (field-acclimated at 0-1°C) and warm response (field-acclimated at 9-16°C). Respiration differed little between cold and warm adapted mosses.

A yearly cycle in the growth of F. duriaei was evident; the moss appeared most healthy photosynthesized at the greatest rate during spring and early summer. After stream temperatures reached their maximum (16°C), the condition declined through fall and into winter. This debilitated appearance was reflected in lower productivity values obtained in the laboratory at stream temperature.

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© 1982

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Aquatic Botany