Abstract

Nitrate and ammonium uptake kinetics were determined for genetically similar sporophytes of Laminaria groenlandica Rosenvinge cultivated in the sea under different ambient N regimes. Generally, plants exposed to relatively high summer ambient N levels had lower uptake rates than those maintained in low N conditions. From this study and the literature, we concluded that species of Laminaria may accommodate different ambient N regimes by ecotypic differentiation, physiological plasticity and ontogenetic differentiation.

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