4.5 Article

Diversity of planktonic photo auto trophic microorganisms along a salinity gradient as depicted by microscopy, flow cytometry, pigment analysis and DNA-based methods

期刊

FEMS MICROBIOLOGY ECOLOGY
卷 49, 期 2, 页码 281-293

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OXFORD UNIV PRESS
DOI: 10.1016/j.femsec.2004.04.002

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diversity; solar salterns; plankton; pigments; genetic fingerprinting

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The diversity of prokaryotic and eukaryotic phytoplankton was studied along a gradient of salinity in the solar salterns of Bras del Port in Santa Pola (Alacant, Spain) using different community descriptors. Chlorophyll a, HPLC pigment composition, flow cytometrically-determined picoplankton concentration, taxonomic composition of phytoplanktori (based on optical microscopy) and genetic fingerprint patterns of 16S (cyanobacteria- and chloroplast-specific primers) and 18S rRNA genes were determined for samples from ponds with salinities ranging from 4% to 37% Both morphological and genetical descriptors of taxonomic composition showed a good agreement and indicated a major discontinuity at salinities between 15% and 22%. The number of classes and the Shannon diversity index corresponding to the different descriptors showed a consistent decreasing trend with increasing salinity. The results indicate a selective effect of extremely high salinities on phytoplanktonic assemblages. (C) 2004 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.

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