Trend of algal toxicity and phyoplankton taxon richness along the French coast | Emodnet Biology

Trend of algal toxicity and phyoplankton taxon richness along the French coast

Introduction

This product, based on data from REPHY: Network Monitoring phytoplankton, provides three products, (i) abundance maps of Dynophysis, (ii) the taxon richness, (iii) the ratio of toxic versus not toxic algae around the French Coast. REPHY was created by Ifremer in 1984, following the observation of many poisonings (diarrhea) of shellfish consumers in 1983 and 1984, on the coast of Brittany. The REPHY is a now nationwide network of twelve coastal laboratories that share the French coast.

Data series

This dataproduct is based on:

REPHY - réseau de surveillance du phytoplancton. Institut Français pour la Recherche et l'exploitation de la mer, Nantes, France

available in EMODnet Biology at : http://www.emodnet-biology.eu/data-catalog?module=dataset&dasid=2451

The abundance data from 1987 till 2014 are available through EMODnet biology at http://www.emodnet-biology.eu/toolbox/en/download/occurrence/dataset/2451

Data product

Several Dinophysis species produce toxins and can cause gastrointestinal illness and Diarrhetic Shellfish Poisoning (DSP), even at low cell densities. For this product 1) Dinophysis abundance data was used to crete gridded abundance maps per season 2) a algal toxicity ratio was calculated by dividing the concentration of harmful planktonic cells by the sum of the harmful and the harmless species 3) taxon richness f the whole REPHY monitoring dataset was calculated. Algal toxins from harmful algal blooms (HABs) can cause shellfish poisoning in humans and be of danger to live stocks in coastal water (Descriptor 5 Eutrophication). Phytoplankton organisms are responsible for about 45% of annual global photosynthesis. They are as such vital for the functioning of marine food webs (considered in MSFD descriptor 4) and are the main drivers of the global biogeochemical cycles.

 

Poisonings are caused by the development of Dinophysis in the coastal environment which produce toxins that cause diarrhea. This product shows the gridded abundance of Dinophysis in spring.

 

 

 

This product shows the trend of the interpolated taxonomic richness index, calculated from the REPHY montoring dataset. 

 

 

A algal toxicity ratio was calculated by dividing the concentration of harmful planktonic cells by the sum of the harmful and the harmless species. This ration gives a provides a proxy 'toxicity' index.

 

More Information

http://www.emodnet-biology.eu/data-catalog?module=dataset&dasid=5461

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