Consulta: subjectFacets:"Toxic dinoflagellates"
Registros recuperados: 5
Data/hora: 16/06/2024 15:18:48

Ostreopsis cf. ovata Bloom in Currais, Brazil: Phylogeny, Toxin Profile and Contamination of Mussels and Marine Plastic Litter
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Tibiriçá, Carlos Eduardo J. A.; Leite, Isabel P.; Batista, Talita V. V.; Fernandes, Luciano F.; Chomérat, Nicolas; Herve, Fabienne; Hess, Philipp; Mafra, Luiz.
Ostreopsis cf. ovata is a toxic marine benthic dinoflagellate responsible for harmful blooms affecting ecosystem and human health, mostly in the Mediterranean Sea. In this study we report the occurrence of a summer O. cf. ovata bloom in Currais, a coastal archipelago located on the subtropical Brazilian coast (~25° S). This bloom was very similar to Mediterranean episodes in many aspects: (a) field-sampled and cultivated O. cf. ovata cells aligned phylogenetically (ITS and LSU regions) along with Mediterranean strains; (b) the bloom occurred at increasing temperature and irradiance, and decreasing wind speed; (c) cell densities reached up to 8.0 × 104 cell cm−2 on fiberglass screen and 5.6 × 105 cell g−1 fresh weight on seaweeds; (d) and toxin profiles...
Tipo: Text
Palavras-chave: Harmful algal bloom; Benthic microalgae; Toxic dinoflagellates; Ovatoxin; Toxin transfer; Seafood safety; Marine pollution; Plastic litter; Biofilm formation.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00509/62037/66177.pdf

Procédés de traitement de l'eau de mer en conchyliculture pour la sauvegarde et le maintien de la qualité des mollusques bivalves
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Castaing, Jean-baptiste.
The aim of this work is the study of seawater filtration process to preserve commercial bivalves and main tain their quality during harmful algal blooms. The originality of this work is based on the study of rustic processes, capable of removing toxic microalgae from seawater. Two filtration processes have been studied, the immersed hollow fibres membranes and a sand filter. The origin and nature of fouling mechanisms have been identified in connection with the selectivity and energy consumption . Suspensions of toxic and nontoxic microalgae were reconstituted and then filtered through 10 kDa, 300 kDa and 0.2 µm membranes and a sand filter (mean grain diameter dg equal to 250-520 µm). Microfiltration membrane 0.2 µm has emerged as the most suitable for the...
Tipo: Text
Palavras-chave: Membranes immergées; Microfiltration; Ultrafiltration; Fibres creuses; Filtre à sable; Mécanismes de colmatage; Dinoflagellés toxiques; Conchyliculture; Bivalves; Immersed membranes; Microfiltration; Ultrafiltration; Hollow fibres; Sand filter; Fouling mechanisms; Toxic dinoflagellates; Shellfish farming; Bivalves.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00092/20349/17994.pdf

Contamination de l'etang de Thau par Alexandrium tamarense. Episode de novembre a decembre 1998
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Abadie, Eric; Zouher, Amzil; Belin, Catherine; Comps, Marie-annick; Elziere-papayanni, Panayota; Lassus, Patrick; Le Bec, Claude; Marcaillou-le Baut, Claire; Nezan, Elizabeth; Poggi, Robert.
A bloom of the toxic dinoflagellate Alexandrium tamarense was observed for the first time in Thau iagoon between November and December 1998. Maximum cell concentrations detected in shellfish farming areas (85 000 Cells/1) were high enough to make mussels and clams unsuitable for human consumption (max. 850 ug. STX eq.100 g'1) while toxic levels in oysters did not exceed, or even reach, the international public health threshold established for PSP toxins.  This event, new to French Mediterranean waters, was investigated by both local and national veterinary services and by the Ifremer teams involved in the National Monitoring Network for Phytoplankton and Phycotoxines (Réphy). The chronological and operational description of the event was compared with data...
Tipo: Text
Palavras-chave: Alexandrium; Monitoring; Toxic dinoflagellates; Thau lagoon; Alexandrium; Surveillance; Dinoflagellés toxiques; Etang de Thau.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-884.pdf

Diversity and Toxicity of the Genus Coolia Meunier in Brazil, and Detection of 44-Methyl Gambierone in Coolia tropicalis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Tibiriçá, Carlos Eduardo Junqueira De Azevedo; Sibat, Manoella; Fernandes, Luciano Felício; Bilien, Gwenael; Chomérat, Nicolas; Hess, Philipp; Mafra, Luiz L.
Coolia is a genus of marine benthic dinoflagellates which is widely distributed in tropical and temperate zones. Toxicity has been reported in selected Coolia species, although the identity of causative compounds is still controversial. In this study, we investigated the taxonomical and toxicological aspects of Coolia species from Brazil. Since light- and electron microscopy-based morphology was not enough to distinguish small-celled species, ITS and LSU D1-D3 phylogenetic analyses were used for species definition. Cultures of Coolia palmyrensis and Coolia santacroce were established from samples collected along the northeastern Brazilian coast, the first record of both species in South Atlantic waters. Cultures of Coolia malayensis and Coolia tropicalis...
Tipo: Text
Palavras-chave: Benthic microalgae; Toxic dinoflagellates; Toxicity assay; Cooliatoxin; 44-methyl gambierone.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00630/74186/73789.pdf

SURVEY OF BENTHIC DINOFLAGELLATESASSOCIATED TO BEDS OF Thalassia testudinumIN SAN ANDRÉS ISLAND, SEAFLOWER BIOSPHERE RESERVE,CARIBBEAN COLOMBIA.
Provedor de dados: Acta Biológica Colombiana
Autores: RODRIGUEZ,E. ANGELICA; MANCERA PINEDA,J. ERNESTO; GAVIO,BRIGITTE.
In order to determine the occurrence of epiphytic toxic dinoflagellates in the coastal waters of San Andrés Island, Caribbean Colombia, we analyzed the seagrass beds on the northern and eastern sides of the island. We found seven species of toxicogenic dinoflagellates, belonging to the genera Prorocentrum and Ostreopsis. The cell densities were generally low if compared with previous studies in other Caribbean sites, ranging from 0 to 836 cells/dry weight. The species encountered are known to produce toxins causing the Diarrehic Shellfish Poisoning and Ciguatera, poisonings which have been documented in the island
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epiphytes; Macroalgae; Ostreopsis; Prorocentrum; Toxic dinoflagellates.
Ano: 2010
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2010000200016