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PHENOTYPIC PLASTICITY IN DRAPARNALDIA (CHAETOPHORACEAE). II. THE PHYSICAL ENVIRONMENT AND CONCLUSIONS
Authors:I. M. Johnstone
Abstract:Eight isolates of Draparnaldia from a variety of freshwater habitats were grown in unialgal, defined culture. The morphological responses of these isolates to different daylengths, light intensities and temperatures are described. The phenotypic expression of Draparnaldia is markedly modified by all three factors. The interaction of these environmental variables was highly significant, and it is not possible, in most cases, to describe or predict the morphological appearance of Draparnaldia by referring to one of these parameters in isolation. The adaptive significance of phenotypic plasticity in Draparnaldia is discussed.
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