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Auteur (up) Caruana, A.M.N.; Le Gac, M.; Herve, F.; Rovillon, G.-A.; Geffroy, S.; Malo, F.; Abadie, E.; Amzil, Z. doi  openurl
  Titre Alexandrium pacificum and Alexandrium minutum: Harmful or environmentally friendly? Type Article scientifique
  Année 2020 Publication Revue Abrégée Mar. Environ. Res.  
  Volume 160 Numéro Pages 105014  
  Mots-Clés Algal toxins; catenella; complex dinophyceae; diatom; dimethylsulfide dms; dimethylsulfoniopropionate dmsp; dimethylsulphoniopropionate; Dinoflagellate; dmsp; dsyB gene; Glycine betaine; growth; Paralytic shellfish toxins; phytoplankton; Phytoplankton; pst; salinity; Salinity; Saxitoxin; shellfish toxin production  
  Résumé Alexandrium minutum and Alexandrium pacificum are representatives of the dinoflagellate genus that regularly proliferate on the French coasts and other global coastlines. These harmful species may threaten shellfish harvest and human health due to their ability to synthesize neurotoxic alkaloids of the saxitoxin group. However, some dinoflagellates such as A. minutum, and as reported here A. pacificum as well, may also have a beneficial impact on the environment by producing dimethylsulfoniopropionate-DMSP, the precursor of dimethylsulfur-DMS and sulfate aerosols involved in climate balance. However, environmental conditions might influence Alexandrium physiology towards the production of harmful or environmentally friendly compounds. After assessing the influence of two salinity regimes (33 and 38) relative to each species origin (Atlantic French coast and Mediterranean Lagoon respectively), it appears that DMSP and toxin content was variable between the three experimented strains and that higher salinity disadvantages toxin production and tends to favor the production of the osmolytes DMSP and glycine betaine. Hence, this key metabolite production is strain and species-dependent and is influenced by environmental conditions of salinity which in turn, can diversely affect the environment. Widespread coastal blooms of A. minutum and A. pacificum, although being a risk for seafood contamination with toxins, are also a DMSP and DMS source that potentially contribute to the ecosystem structuration and climate. Regarding recent advances in DMSP biosynthesis pathway, 3 dsyB homologs were found in A. minutum but no homolog of the diatom sequence TpMMT.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0141-1136 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000571185300020 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2903  
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