The contribution of crassulacean acid metabolism to the annual productivity of two aquatic vascular plants.

Net annual productivity and annual carbon budgets were determined for populations of Littorella uniflora var. americana and Isoetes macrospora in a mesotrophic and oligotrophic lake in northern Wisconsin, to assess the contribution of Crassulacean Acid Metabolism (CAM) to annual productivity of the species in their natural environment. Nocturnal carbon accumulation (CAM), daytime uptake of external CO via the C mechanism, and refixation of endogenously generated CO from daytime respiration were the sources of carbon income.

Seasonal diurnal acid rhythms in two aquatic crassulacean acid metabolism plants.

The diurnal change in titrable acidity in two aquatic CAM plants, Littorella uniflora var. americana (Fern.) Gl.

Coexistence and the comparative light relations of the submersed macrophytes Myriophyllum spicatum L. and Vallisneria americana Michx.

The Eurasian watermilfoil (Myriophyllum spicatum L.) has partially replaced wild celery (Vallisneria americana Michx.) as a community dominant in the littoral zones of lakes of Madison, Wisconsin.

Temperature acclimation of net photosynthesis in relation to growth of a cold hardy Chrysanthemum.

Direct and interactive effects of daylength and temperature preconditioning of above- and below-ground parts of Chrysanthemum morifolium Ramat. 'Astrid' are examined in relation to net photosynthesis. Most previous work on thermal preconditioning has concentrated on the effects of a given thermal regime on entire plants, without attempts to separate the effects of temperature acting on shoots vs.

Temperature dependence of net photosynthesis in Trientalis borealis Raf. in Wisconsin.

Multivariate analysis of variance was used in testing 16 gas exchange curves derived from three populations of Trientalis borealis Raf., to demonstrate lack of evidence for ecotypic differentiation with respect to thermal adaptation of net photosynthesis among the populations examined. Limitations of these conclusions are discussed.