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JPR Advance Access published online on January 8, 2009
Journal of Plankton Research, doi:10.1093/plankt/fbn124
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Diversification of phytoplankton community structure and related parameters along a large-scale longitudinal east–west transect of the Mediterranean Sea

Lydia Ignatiades1,*, Olympia Gotsis-Skretas2, Kalliopi Pagou2 and Evangelia Krasakopoulou2

1 National Centre for Scientific Research "Demokritos", Institute of Biology, Agia Paraskevi, 15310 Athens, Greece 2 Hellenic Centre for Marine Research, Institute of Oceanography, 19013 Anavyssos, Greece

* CORRESPONDING AUTHOR: igna{at}bio.demokritos.gr, lyigna{at}otenet.gr

Received on April 22, 2008; accepted on November 29, 2008


  Abstract

Environmental and phytoplankton parameters were explored at nine stations located along a large scale (3188 km) east–west longitudinal transect (4°95'E–32°67'E) of the Mediterranean Sea. The trend analysis confirmed a statistically significant east–west decrease of mean temperatures and salinities and an increase of nutrients (P-PO4 and N-NO3), chlorophyll {alpha}, primary productivity and phytoplankton cell concentrations. A total of 216 species were identified: 48 diatoms, 112 dinoflagellates and 56 coccolithophores. On the basis of this analysis, the structure of the microphytoplankton community (Shannon's diversity, species richness, taxa dominance and community dissimilarities) along the transect was investigated. Many species (102) of this community were rare, having a frequency of occurrence ≤2.0 in all samples, but they were very important because they controlled the levels of species diversity. A highly significant power relationship between "species number–sample number" was also recorded along the studied transect. The analysis showed that the prevailing east–west gradients of the physical and chemical conditions determined phytoplankton abundance and community diversification.

Corresponding editor: John Dolan


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