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was followed and is described here.

We developed an algorithm adjustable for Rias Baixas that improves the accuracy of chla concentration retrieval from MERIS (FR) data. The retrieval of chla using the model developed in this study was successful even in the cases that the standard Regional Processor for Case 2 waters failed to provide reliable data. The application of the algorithm developed in this study indicated that a satellite sensor like MERIS is suitable for remote sensing studies of water quality in the Rias Baixas.

Domoic Acid (DA) was detected throughout the sampling area, ranging from 0.02 to 2.54 μg DA L-1 (immunoassay). Cellular concentration of DA determined according to Pseudo-nizschia spp. abundance ranged from 5 to 38 pg DA cell-1. Cellular concentration of DA that observed in this study coincides with other studies for natural populations of Pseudo-nizschia spp. in which DA was determined with Chromatography (HPLC).

Finally, we examined if N.scintillans can feed actively on a toxic dinoflagellate that produces PSP. Alexandrium minutum was chosen because it can occur with N. scintillans in Rias Baixas. In order to asses if N. scintillans can act as a vector to PSP N. scintillans were tested for the presence of toxin accumulated in their cells. N. scintillans was able to ingest A. minutum in vacuoles. This is the first data to our knowledge of N.scintillans feeding on toxic dinoflagellate in laboratory conditions.

Molecular Biology of the pathosystem between the brown algal host Ectocarpus siliculosus and the oomycete Eurychasma dicksonii.

Strittmatter M1, Gachon C.M.M1, van West P2 & Küpper F.C1

1 The Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban PA37 1QA, Scotland, UK

2 Aberdeen Oomycete Group, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen, AB25 2ZD, United Kingdom

* speaker

The intracellular, obligate-biotrophic pathogen Eurychasma dicksonii is the most widespread eukaryotic pathogen of marine brown algae, and also the most basal member of the oomycete lineage. This algal parasite has the broadest host range described so far for marine pathogens and occurs worldwide in cold and temperate waters.

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