Abadie E., Muguet A., Berteaux T., Chomerat N., Hess P., D'OrbCastel E. R., Masseret Estelle, Laabir Mohamed. (2016). Toxin and growth responses of the neurotoxic dinoflagellate Vulcanodinium rugosum to varying temperature and salinity. Toxins, 8 (5), p. art. 136 [18 p.]. ISSN 2072-6651.
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Toxin and growth responses of the neurotoxic dinoflagellate Vulcanodinium rugosum to varying temperature and salinity
Vulcanodinium rugosum, a recently described species, produces pinnatoxins. The IFR-VRU-01 strain, isolated from a French Mediterranean lagoon in 2010 and identified as the causative dinoflagellate contaminating mussels in the Ingril Lagoon (French Mediterranean) with pinnatoxin-G, was grown in an enriched natural seawater medium. We tested the effect of temperature and salinity on growth, pinnatoxin-G production and chlorophyll a levels of this dinoflagellate. These factors were tested in combinations of five temperatures (15, 20, 25, 30 and 35 degrees C) and five salinities (20, 25, 30, 35 and 40) at an irradiance of 100 mu mol photon m(-2) s(-1). V. rugosum can grow at temperatures and salinities ranging from 20 degrees C to 30 degrees C and 20 to 40, respectively. The optimal combination for growth (0.39 +/- 0.11 d(-1)) was a temperature of 25 degrees C and a salinity of 40. Results suggest that V. rugosum is euryhaline and thermophile which could explain why this dinoflagellate develops in situ only from June to September. V. rugosum growth rate and pinnatoxin-G production were highest at temperatures ranging between 25 and 30 degrees C. This suggests that the dinoflagellate may give rise to extensive blooms in the coming decades caused by the climate change-related increases in temperature expected in the Mediterranean coasts.
