Abstract
The uptake of ammonium, nitrate and phosphate by laboratory-grown young sporophytes of Laminaria abyssalis was measured in a perturbed system (batch mode) at 18 °C and 35 ± 5 µE m−2 s−1 photon flux density. Uptake of all appeared to follow saturation-type nutrient uptake kinetics. The NO sup−inf3 (K s = 14.0 µM, V max = 5.0 µmol h−1 g−1 dry wt) and NH sup+inf4 (K s = 4.6 µM, V max= 2.0 µmol h−1 g−1 dry wt) were taken up simultaneously, although NH sup+inf4 was taken up more rapidly. Values of K 3 and V max for phosphate were, respectively, 2.21 µM and 0.83 µmol h−1 g−1 dry wt. Nitrate and phosphate were both consumed in similar rates (V max /Ks ∼ 0.37) at low concentrations. NH sup+inf4 , thus, might be a more efficient form of N fertilizer if artificial enrichment of seawater is used.
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Braga, A.d.C., Yoneshigue-Valentine, Y. Nitrogen and phosphorus uptake by the Brazilian kelp Laminaria abyssalis (Phaeophyta) in culture. Hydrobiologia 326, 445–450 (1996). https://doi.org/10.1007/BF00047844
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DOI: https://doi.org/10.1007/BF00047844