| |
Enregistrements |
Liens |
|
Auteur  |
Abadie, E.; Muguet, A.; Berteaux, T.; Chomérat, N.; Hess, P.; ROQUE D'ORBCASTEL, E.; Masseret, E.; Laabir, M. |
|
| |
Titre |
Toxin and Growth Responses of the Neurotoxic Dinoflagellate Vulcanodinium rugosum to Varying Temperature and Salinity |
Type |
Article scientifique |
| |
Année |
2016 |
Publication |
|
Revue Abrégée |
Toxins |
|
| |
Volume |
8 |
Numéro |
5 |
Pages |
136 |
|
| |
Mots-Clés |
Vulcanodinium rugosum; growth conditions; Mediterranean Ingril Lagoon; Salinity; Temperature; toxin production |
|
| |
Résumé |
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 °C) and five salinities (20, 25, 30, 35 and 40) at an irradiance of 100 µmol photon m−2 s−1. V. rugosum can grow at temperatures and salinities ranging from 20 °C to 30 °C and 20 to 40, respectively. The optimal combination for growth (0.39 ± 0.11 d−1) was a temperature of 25 °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 °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. |
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
en |
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
1568 |
|
| Lien permanent pour cet enregistrement |
| |
|
| |
|
Auteur |
Abi-Khalil, C.; Lopez-Joven, C.; Abadie, E.; Savar, V.; Amzil, Z.; Laabir, M.; Rolland, J.-L. |
|
| |
Titre |
Exposure to the Paralytic Shellfish Toxin Producer Alexandrium catenella Increases the Susceptibility of the Oyster Crassostrea gigas to Pathogenic Vibrios |
Type |
Article scientifique |
| |
Année |
2016 |
Publication |
|
Revue Abrégée |
Toxins |
|
| |
Volume |
8 |
Numéro |
1 |
Pages |
24 |
|
| |
Mots-Clés |
defense; environment; harmful algae; interaction; paralytic shellfish toxin; pathogens |
|
| |
Résumé |
The multifactorial etiology of massive Crassostrea gigas summer mortalities results from complex interactions between oysters, opportunistic pathogens and environmental factors. In a field survey conducted in 2014 in the Mediterranean Thau Lagoon (France), we evidenced that the development of the toxic dinoflagellate Alexandrium catenella, which produces paralytic shellfish toxins (PSTs), was concomitant with the accumulation of PSTs in oyster flesh and the occurrence of C. gigas mortalities. In order to investigate the possible role of toxic algae in this complex disease, we experimentally infected C. gigas oyster juveniles with Vibrio tasmaniensis strain LGP32, a strain associated with oyster summer mortalities, after oysters were exposed to Alexandrium catenella. Exposure of oysters to A. catenella significantly increased the susceptibility of oysters to V. tasmaniensis LGP32. On the contrary, exposure to the non-toxic dinoflagellate Alexandrium tamarense or to the haptophyte Tisochrysis lutea used as a foraging alga did not increase susceptibility to V. tasmaniensis LGP32. This study shows for the first time that A. catenella increases the susceptibility of Crassostrea gigas to pathogenic vibrios. Therefore, in addition to complex environmental factors explaining the mass mortalities of bivalve mollusks, feeding on neurotoxic dinoflagellates should now be considered as an environmental factor that potentially increases the severity of oyster mortality events. |
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
Langue |
en |
Langue du Résumé |
|
Titre Original |
|
|
| |
Éditeur de collection |
|
Titre de collection |
|
Titre de collection Abrégé |
|
|
| |
Volume de collection |
|
Numéro de collection |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
1623 |
|
| Lien permanent pour cet enregistrement |
| |
|
| |
|
Auteur |
Ben-Gharbia, H.; Yahia, O.K.-D.; Amzil, Z.; Chomerat, N.; Abadie, E.; Masseret, E.; Sibat, M.; Triki, H.Z.; Nouri, H.; Laabir, M. |
|
| |
Titre |
Toxicity and Growth Assessments of Three Thermophilic Benthic Dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) Developing in the Southern Mediterranean Basin |
Type |
Article scientifique |
| |
Année |
2016 |
Publication |
|
Revue Abrégée |
Toxins |
|
| |
Volume |
8 |
Numéro |
10 |
Pages |
297 |
|
| |
Mots-Clés |
coastal waters; Coolia monotis; environmental-factors; growth; gulf-of-california; harmful algal blooms; marine dinoflagellate; multiple sequence alignment; new-zealand; okadaic acid; Ostreopsis cf. ovata; Prorocentrum lima; Southern Mediterranean Sea; sp-nov dinophyceae; toxicity; toxin profile |
|
| |
Résumé |
Harmful benthic dinoflagellates, usually developing in tropical areas, are expanding to temperate ecosystems facing water warming. Reports on harmful benthic species are particularly scarce in the Southern Mediterranean Sea. For the first time, three thermophilic benthic dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) were isolated from Bizerte Bay (Tunisia, Mediterranean) and monoclonal cultures established. The ribotyping confirmed the morphological identification of the three species. Maximum growth rates were 0.59 +/- 0.08 d(-1) for O. cf. ovata, 0.35 +/- 0.01 d(-1) for C. monotis and 0.33 +/- 0.04 d(-1) for P. lima. Toxin analyses revealed the presence of ovatoxin-a and ovatoxin-b in O. cf. ovata cells. Okadaic acid and dinophysistoxin-1 were detected in P. lima cultures. For C. monotis, a chromatographic peak at 5.6 min with a mass m/z = 1061.768 was observed, but did not correspond to a mono-sulfated analogue of the yessotoxin. A comparison of the toxicity and growth characteristics of these dinoflagellates, distributed worldwide, is proposed. |
|
| |
Adresse |
|
|
| |
Auteur institutionnel |
|
Thèse |
|
|
| |
Editeur |
|
Lieu de Publication |
|
Éditeur |
|
|
| |
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 |
2072-6651 |
ISBN |
|
Médium |
|
|
| |
Région |
|
Expédition |
|
Conférence |
|
|
| |
Notes |
|
Approuvé |
pas de |
|
| |
Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
1690 |
|
| Lien permanent pour cet enregistrement |
