Nutrient kinetics modeled from time series of substrate depletion and growth: dissolved silicate uptake of Baltic Sea spring diatoms

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Date: Feb. 2010
From: Marine Biology(Vol. 157, Issue 2)
Publisher: Springer
Document Type: Author abstract; Report
Length: 214 words

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Abstract :

Byline: Kristian Spilling (1), Timo Tamminen (1), Tom Andersen (2), Anke Kremp (1) Abstract: We estimated silicate uptake kinetics for 8 spring diatom species using a model based on time series measurements of the depletion of dissolved silicate (DSi) and increases in biomass. Furthermore, the carbon: nitrogen: silicate stoichiometric relationships and maximum growth rates were determined. Differences in DSi uptake kinetics and maximum growth rate were distinct among the species. All the most common diatom species (Chaetoceros wighamii, Pauliella taeniata, Skeletonema costatum and Thalassiosira baltica) were relatively lightly silicified and had variable but relatively low half-saturation constants (K .sub.s), indicating that they are well adapted to low DSi concentrations. The less common Diatoma tenuis and Nitzschia frigida had higher K .sub.s values, suggesting that they are more vulnerable to DSi limitation. The much used nitrogen:silicate ratio of 1 for marine diatom biomass was too low for most of the examined species, while a ratio of 2--3 seems to be more appropriate for these Baltic Sea species. Author Affiliation: (1) Finnish Environment Institute, PO Box 140, 00251, Helsinki, Finland (2) Department of Biology, University of Oslo, PO Box 1066, Blindern, 0316, Oslo, Norway Article History: Registration Date: 15/10/2009 Received Date: 04/05/2009 Accepted Date: 15/10/2009 Online Date: 03/11/2009 Article note: Communicated by S. W. A. Naqvi.

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Gale Document Number: GALE|A216342207