Bioavailability of different chemical forms of dissolved silica can affect marine diatom growth

In this study, it was demonstrated that dissolved silica obtained from mineral (crystalline quartz), biogenic amorphous (diatomaceous earth) and artificial amorphous sources (Aerosil) influence the growth rate of two marine diatom species (Chaetoceros sp. and Skeletonema marinoi). Maximum cell densi...

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Bibliographic Details
Published inBiologia marina mediterranea Vol. 19; no. 1; pp. 230 - 231
Main Authors Capellacci, S, Battocchi, C, Casabianca, S, Giovine, M, Bavestrello, G, Penna, A
Format Journal Article
LanguageItalian
Published 01.03.2012
Subjects
Bacillariophyceae
Chaetoceros
Marine
Skeletonema marinoi
MED, Italy
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Summary:In this study, it was demonstrated that dissolved silica obtained from mineral (crystalline quartz), biogenic amorphous (diatomaceous earth) and artificial amorphous sources (Aerosil) influence the growth rate of two marine diatom species (Chaetoceros sp. and Skeletonema marinoi). Maximum cell densities and growth rates of both species in the presence of dissolved silica derived from crystalline quartz and metasilicate were higher than those obtained with the other silica sources. The results demonstrate that the soluble silicon compounds generated in seawater by crystalline sources are highly bioavailable compared to those generated by amorphous materials. These findings are potentially of considerable ecological importance and may contribute to clarifying anomalous spatial and temporal distributions of siliceous organisms with respect to the presence of lithogenic or biogenic silica sources in marine environments.
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ISSN:1123-4245