Diurnal patterns of gas-exchange and metabolic pools in tundra plants during three phases of the arctic growing season.

Glucose-fructose concentrations were generally lowest between ∼08:00 and noon in most species; however, there were no significant diurnal changes in glucose-fructose concentrations in at least one time period for all the species, and several of the patterns were marginally significant (e.g., melt out and peak values for Betula , peak values for Eriophorum , and fall values for Vaccinium ).

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