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A sub-individual multilevel approach for an integrative assessment of CuO nanoparticle effects on Corbicula fluminea Texte intégral
2019
Koehle-Divo, Vanessa | Sohm, Benedicte | Giamberini, Laure | Pauly, Daniele | Flayac, Justine | Devin, Simon | Auffan, Melanie | Mouneyrac, Catherine | Pain-Devin, Sandrine | Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Mer, molécules et santé EA 2160 (MMS) ; Le Mans Université (UM)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) ; Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences Pharmaceutiques et Biologiques (UFR SPB) ; Université de Nantes (UN)-Université de Nantes (UN) | Region Grand-Est | Centre National de la Recherche Scientifique (CNRS)European Commission | Ministry of Research, France | ANR-13-CESA-0014,nanoSALT,Nanomatériaux à travers un gradient de salinité: exposition et effets ecotoxicologiques au cours de leur cycle de vie (production, utilisation, fin de vie)(2013)
International audience | Because they are widely used, copper oxide nanoparticles (CuO NPs) are likely to enter the aquatic environment and then reach the sediment. We have examined the effect of CuO NPs in the freshwater endobenthic bivalve Corbicula fluminea. Some previous studies have investigated effects at biochemical and physiological levels, but molecular endpoints are still poorly studied despite they are sensitive in early detection of NPs effect. In the present study, we have investigated short-term effects (96 h) of CuO NP (12, 30 nm; 0, 20 and 100 mg/L) using molecular endpoints as well as more conventional biochemical and physiological markers. The expression of antioxidant (CuZnSOD, MnSOD, Cat, Se-GPx, Trxr) and antitoxic (GST-Pi, HSP70, MT, Pgp, MRP1) related genes was measured at the mRNA level while anti-oxidant (SOD, TAC) and antitoxic (GST, ACP) defenses, energetic reserves and metabolism (ETS, Tri, LDH), and cellular damages (LPO) were assessed using a biochemical approach. The filtration rate measured at 96 h provided information at the physiological scale. Gene expression and filtration rate were responsive to CuO NPs but the effects differed according to the NP size. The results suggest that defense mechanisms may have been set up following 30 nm-NP exposure. The response to 12 nm-NP was lower but still showed that exposure to 12 nm-NP led to activation of cellular elimination mechanisms. The lowering of the filtration rate may have protected the organisms from the contamination. However, this raised the question of further repercussions on organism biology. Together, the results (i) indicate that CuO NP may exert effects at different levels even after a short-term exposure and (ii) point out the precocity of molecular response.
Afficher plus [+] Moins [-]Physiological impacts of pollution exposure in seabird's progeny nesting in a Mediterranean contaminated area Texte intégral
2019
Oudi, Abir | Chokri, Mohamed Ali | Hammouda, Abdessalem | Chaabane, Rim | Badraoui, Riadh | Besnard, Aurélien | Santos, Raphael | Université de Gabès = University of Gabes | Hedi Chaker Hospital [Sfax] (CHU Sfax) | جامعة صفاقس - Université de Sfax - University of Sfax | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Haute École spécialisée de Suisse occidentale = HES-SO University of Applied Sciences and Arts Western Switzerland = Fachhochschule Westschweiz [Schweiz] (HES-SO)
Physiological impacts of pollution exposure in seabird's progeny nesting in a Mediterranean contaminated area Texte intégral
2019
Oudi, Abir | Chokri, Mohamed Ali | Hammouda, Abdessalem | Chaabane, Rim | Badraoui, Riadh | Besnard, Aurélien | Santos, Raphael | Université de Gabès = University of Gabes | Hedi Chaker Hospital [Sfax] (CHU Sfax) | جامعة صفاقس - Université de Sfax - University of Sfax | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Haute École spécialisée de Suisse occidentale = HES-SO University of Applied Sciences and Arts Western Switzerland = Fachhochschule Westschweiz [Schweiz] (HES-SO)
International audience | Aquatic wildlife is exposed through trophic transfer of hazardous substances to several threats inducing physiological impairments. We aimed at assessing the impact of contamination in one of the hot spots of pollution along Mediterranean coasts, the gulf of Gabes in Tunisia, on Common tern Sterna hirundo, a piscivorous top predator bird. Firstly, we compared the reproductive effort of breeding adults through clutch size distribution in three sites with different levels of pollution. Then, a battery of genotoxicity and oxidative stress biomarkers was carried out to assess physiological impairments in chicks. While defense mechanisms showed a depletion, lipid peroxidation and genotoxicity increased significantly according to pollution level. The multi-biomarker approach used here, discriminated chicks according to contamination degree of their nesting sites. Increases in genotoxicity and oxidative stress were correlated to a decrease in chick body mass known to lead to long-term impacts on juvenile survival and recruitment in birds.
Afficher plus [+] Moins [-]Physiological impacts of pollution exposure in seabird's progeny nesting in a Mediterranean contaminated area Texte intégral
2019
Oudi, Abir | Chokri, Mohamed Ali | Hammouda, Abdessalem | Chaabane, Rim | Badraoui, Riadh | Besnard, Aurélien | Santos, Raphaël
Aquatic wildlife is exposed through trophic transfer of hazardous substances to several threats inducing physiological impairments. We aimed at assessing the impact of contamination in one of the hot spots of pollution along Mediterranean coasts, the gulf of Gabes in Tunisia, on Common tern Sterna hirundo, a piscivorous top predator bird. Firstly, we compared the reproductive effort of breeding adults through clutch size distribution in three sites with different levels of pollution. Then, a battery of genotoxicity and oxidative stress biomarkers was carried out to assess physiological impairments in chicks. While defense mechanisms showed a depletion, lipid peroxidation and genotoxicity increased significantly according to pollution level. The multi-biomarker approach used here, discriminated chicks according to contamination degree of their nesting sites. Increases in genotoxicity and oxidative stress were correlated to a decrease in chick body mass known to lead to long-term impacts on juvenile survival and recruitment in birds.
Afficher plus [+] Moins [-]How to get rid of ingested microplastic fibers? A straightforward approach of the Atlantic ditch shrimp Palaemon varians Texte intégral
2019
Saborowski, Reinhard | Paulischkis, Eva | Gutow, Lars
Microplastic fibers represent a significant share of the global marine micrcroplastic pollution, particularly in coastal areas. In controlled laboratory experiments, we offered fluorescent microplastic fibers (40–4400 μm lengths, median 150 μm) and spherical microplastic beads (9.9 μm Ø) together with commercial fish food to the Atlantic ditch shrimp Palaemonetes varians. The shrimps ingested fibers and beads along with the food. Upon ingestion, the beads and the shortest fibers (up to 100 μm) passed from the stomach into the gut and were egested within the fecal strings. The longer fibers first remained in the stomach but were regurgitated, i.e. extruded through the esophagus, within 12–14 h. Regurgitation is an evolutionary adaptation of particular crustacean species and other invertebrates to remove large and indigestible food particles from the stomach. Accordingly, the process of regurgitation attained a new task nowadays, i.e. the elimination of anthropogenic filamentous microplastic debris from the stomach to avoid harm. This behavioral feature may represent a selective advantage in view of the continuously increasing environmental plastic pollution.
Afficher plus [+] Moins [-]Epoxiconazole exposure affects terpenoid profiles of oilseed rape plantlets based on a targeted metabolomic approach Texte intégral
2019
Durenne, Bastien | Blondel, Alodie | Druart, Philippe | Fauconnier, Marie-Laure | Centre wallon de recherches agronomiques
Epoxiconazole exposure affects terpenoid profiles of oilseed rape plantlets based on a targeted metabolomic approach Texte intégral
2019
Durenne, Bastien | Blondel, Alodie | Druart, Philippe | Fauconnier, Marie-Laure | Centre wallon de recherches agronomiques
peer reviewed | Epoxiconazole is a broad-spectrum fungicide described as highly persistent in soil and as such can be considered as an abiotic agent like other problematic agrochemicals. Furthermore, the plant phenotyping tool involving non-invasive monitoring of plant-emitted volatile organic compounds (VOCs) may be useful in the identification of metabolic markers for abiotic stress. We therefore decided to profile the VOCs from secondary metabolism of oilseed rape through a dose-response experiment under several epoxiconazole concentrations (0, 0.01, 0.1 and 1 mg L−1). VOC collections of 35-day-old whole plantlets were performed through a dynamic headspace sampling technique under defined and controlled conditions. The plantlets grew freely within a home-made, laboratory and high-throughput glass chamber without any disturbance. Putative metabolic markers were analysed using a targeted metabolomic approach based on TD-GC-MS method coupled with data acquisition in SIM mode in order to focus on terpenes and sulphur-containing volatiles. Chromatograms of emitted terpenes were achieved accurately for the 35-day-old oilseed rape plantlets. We also analysed the presence of sulphur-containing volatiles in samples of shoot and root tissues using an innovative DHS-TD-GC-MS method, but no difference was found between qualitative profiles. Nevertheless, we demonstrated through this experiment that sesquiterpenes such as β-elemene and (E,E)-α-farnesene are involved in epoxiconazole dose-response. In particular, (E,E)-α-farnesene could serve as a metabolic marker of fungicide exposure for oilseed rape plantlets.
Afficher plus [+] Moins [-]Epoxiconazole exposure affects terpenoid profiles of oilseed rape plantlets based on a targeted metabolomic approach Texte intégral
2019
Durenne, Bastien | Blondel, Alodie | Druart, Philippe | Fauconnier, Marie-Laure
Epoxiconazole is a broad-spectrum fungicide described as highly persistent in soil and as such can be considered as an abiotic agent like other problematic agrochemicals. Furthermore, the plant phenotyping tool involving non-invasive monitoring of plant-emitted volatile organic compounds (VOCs) may be useful in the identification of metabolic markers for abiotic stress. We therefore decided to profile the VOCs from secondary metabolism of oilseed rape through a dose-response experiment under several epoxiconazole concentrations (0, 0.01, 0.1 and 1 mg L⁻¹). VOC collections of 35-day-old whole plantlets were performed through a dynamic headspace sampling technique under defined and controlled conditions. The plantlets grew freely within a home-made, laboratory and high-throughput glass chamber without any disturbance. Putative metabolic markers were analysed using a targeted metabolomic approach based on TD-GC-MS method coupled with data acquisition in SIM mode in order to focus on terpenes and sulphur-containing volatiles. Chromatograms of emitted terpenes were achieved accurately for the 35-day-old oilseed rape plantlets. We also analysed the presence of sulphur-containing volatiles in samples of shoot and root tissues using an innovative DHS-TD-GC-MS method, but no difference was found between qualitative profiles. Nevertheless, we demonstrated through this experiment that sesquiterpenes such as β-elemene and (E,E)-α-farnesene are involved in epoxiconazole dose-response. In particular, (E,E)-α-farnesene could serve as a metabolic marker of fungicide exposure for oilseed rape plantlets.
Afficher plus [+] Moins [-]Nitrogen mass balance of a biotrickling filter treating NH3 emissions from pig facilities. Device control using electrical conductivity measurement Texte intégral
2019
Dumont, Eric | Lagadec, Solène | Guingand, Nadine | Loyon, Laurence | Amrane, Abdeltif | Couvert, Annabelle
Impact of urbanisation (trends) on runoff behaviour of Pampulha watersheds (Brazil) Texte intégral
2019
Seidl, Martin | Hadrich, Bilel | Palmier, Luiz | Petrucci, Guido | Nascimento, Nilo | Laboratoire Eau Environnement et Systèmes Urbains (LEESU) ; AgroParisTech-École nationale des ponts et chaussées (ENPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) | Hydraulic and water resource engineering department (EHR) ; Universidade Federal de Minas Gerais = Federal University of Minas Gerais [Belo Horizonte, Brazil] (UFMG) | Finep Brazil | UFMG Brazil / ENPC France
International audience | The paper presents an analysis of runoff behaviour of four urban catchments between the municipalities of Belo Horizonte and Contagem in Brazil, linked to their land use. Two years of online measurement of flow data, combined with spatial analysis, was linked through runoff modelisation with EPA SWMM. The coefficients of Nash obtained varying between 0.75 and 0.87 demonstrated an adequate modelling approach. A 1-year rain series was applied to evaluate the runoff behaviour of actual land cover and that of 2002. The peak flows normalised to watershed surfaces revealed as the most urbanised (85%) watershed Ressaca with 178 L/ha/s, three times more runoff intensive than the least urbanised (41%) Mergulhão with 67 L/ha/s. Statistical analysis of land cover data and modelling results on watershed and sub-watershed level showed main correlations between hydrological parameters such as peak flow, average event flow and restitution time, but also between land cover and runoff coefficient. This approach gave a linear relation between runoff and green surface, with a runoff coefficient of 0.86 for fully urbanised zone and 0.43 for full “green” cover. Prospective simulation with actual urbanisation rates varying from 4 to 34 ha/year suggested an increase between 6 and 18% of the flows and a possible end of urbanisation within the next two to three decades. These findings should contribute to a better understanding of hydrological impact of Belo Horizonte urbanisation and to the restauration of its Lake Pampulha.
Afficher plus [+] Moins [-]Microplastic contamination of sediment and water column in the Seine River Estuary | Contamination en microplastiques dans les sédiment et colonne d'eau de l'estuaire de la Seine Texte intégral
2019
Alligant, Soline | Gasperi, Johnny | Rakwe, El | Dreanno, Catherine | Gangnery, Aline | Maheux, Frank | Simon, Benjamin | Halm-Lemeille, Marie-Pierre | Cachot, Jérôme | Tassin, Bruno | Laboratoire Eau Environnement et Systèmes Urbains (LEESU) ; AgroParisTech-École nationale des ponts et chaussées (ENPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) | Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) | Laboratoire Environnement Ressources de Normandie (LERN) ; Unité Observation et écologie de la restauration des écosystèmes littoraux (COAST) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) | Environnements et Paléoenvironnements OCéaniques (EPOC) ; École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Proceedings of the 2nd International Conference on Microplastic Pollution in the Mediterranean Sea, Capri, ITALIE, 15-/09/2019 - 18/09/2019 | International audience | Nowadays, microplastic (MPs) pollution is well documented in marine ecosystems since the first publication alarming about marine plastic pollution in 1972 [1]. Similarly, continental contamination is more and more investigated. More recently, interest for estuarine systems is growing. Estuaries are considered as a suspected predominant pathway for microplastic pollution from continent to oceans. The specific conditions of estuaries, like salinity gradient, tides and hydrodynamics, could affect the repartition, settling and transfer of microplastics to marine systems.
Afficher plus [+] Moins [-]Biocide emissions from building materials during wet weather: identification of substances, mechanism of release and transfer to the aquatic environment Texte intégral
2019
Paijens, Claudia | Bressy, Adèle | Frere, Bertrand | Moilleron, Régis | Laboratoire Eau Environnement et Systèmes Urbains (LEESU) ; AgroParisTech-École nationale des ponts et chaussées (ENPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) | Laboratoire Central de la Préfecture de Police (LCPP) ; Préfecture de police de Paris | OPUR
International audience | Biocides are added to or applied on building materials to prevent microorganisms from growing on their surface or to treat them. They are leached into building runoff and contribute to diffuse contamination of receiving waters. This review aimed at summarizing the current state of knowledge concerning the impact of biocides from buildings on the aquatic environment. The objectives were (i) to assess the key parameters influencing the leaching of biocides and to quantify their emission from buildings; (ii) to determine the different pathways from urban sources into receiving waters; and (iii) to assess the associated environmental risk. Based on consumption data and leaching studies, a list of substances to monitor in receiving water was established. Literature review of their concentrations in the urban water cycle showed evidences of contamination and risk for aquatic life, which should put them into consideration for inclusion to European or international monitoring programs. However, some biocide concentration data in urban and receiving waters is still missing to fully assess their environmental risk, especially for isothiazolinones, iodopropynyl carbamate, zinc pyrithione and quaternary ammonium compounds, and little is known about their transformation products. Although some models supported by actual data were developed to extrapolate emissions on larger scales (watershed or city scales), they are not sufficient to prioritize the pathways of biocides from urban sources into receiving waters during both dry and wet weathers. Our review highlights the need to reduce emissions and limit their transfer into rivers, and reports several solutions to address these issues.
Afficher plus [+] Moins [-]Nitrogen mass balance of a biotrickling filter treating NH3 emissions from pig facilities. Device control using electrical conductivity measurement Texte intégral
2019
Dumont, Eric | Lagadec, Solène | Guingand, Nadine | Loyon, Laurence | Amrane, Abdeltif | Couvert, Annabelle | Institut Universitaire de Technologie - Nantes (IUT Nantes) ; Université de Nantes (UN) | Traitement Eau Air Métrologie (GEPEA-TEAM) ; Laboratoire de génie des procédés - environnement - agroalimentaire (GEPEA) ; Institut Universitaire de Technologie - Nantes (IUT Nantes) ; Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) ; Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire) ; Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN) ; Université de Nantes (UN)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique) ; Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon) ; Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes) ; Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) ; Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire) ; Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN) ; Université de Nantes (UN)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique) ; Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon) ; Université de Nantes (UN) | Chambre Régionale d'Agriculture de Bretagne | Institut du Porc (IFIP) | Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Institut des Sciences Chimiques de Rennes (ISCR) ; Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes) ; Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)
International audience
Afficher plus [+] Moins [-]Harmful phytoplankton in the Beagle Channel (South America) as a potential threat to aquaculture activities Texte intégral
2019
Almandoz, Gastón O | Cefarelli, Adrián O | Diodato, Soledad | Montoya, Nora G | Benavides, Hugo R | Carignan, Mario | Hernando, Marcelo | Fabro, Elena | Metfies, Katja | Lundholm, Nina | Schloss, Irene R | Álvarez, Marcela | Ferrario, Martha E
Harmful phytoplankton in the Beagle Channel (South America) as a potential threat to aquaculture activities Texte intégral
2019
Almandoz, Gastón O | Cefarelli, Adrián O | Diodato, Soledad | Montoya, Nora G | Benavides, Hugo R | Carignan, Mario | Hernando, Marcelo | Fabro, Elena | Metfies, Katja | Lundholm, Nina | Schloss, Irene R | Álvarez, Marcela | Ferrario, Martha E
The Beagle Channel is a remote subantarctic environment where mussel aquaculture initiatives have existed since the early 1990s. Here we analyze phytoplankton biomass and composition, and the occurrence of harmful microalgae species and their toxins at three sites during the period 2015–2016. The occurrence of potentially harmful algae was observed throughout the study period, including toxigenic dinoflagellates such as Alexandrium catenella (Group I of the A. tamarense complex), A. ostenfeldii, Dinophysis acuminata, Gonyaulax spinifera, Azadinium sp., and the diatoms Pseudo-nitzschia australis and P. fraudulenta. Toxic dinoflagellates were detected in low densities whereas a Pseudo-nitzschia bloom was observed in late February. Isolates of A. catenella and P. delicatissima sensu stricto were phylogenetically characterized. The toxin profile of A. catenella was dominated by GTX4, while P. delicatissima sensu stricto showed no production of the neurotoxin domoic acid in culture conditions. The results provide base-line information for the management of harmful algal blooms in this little explored subantarctic area.
Afficher plus [+] Moins [-]Harmful phytoplankton in the Beagle Channel (South America) as a potential threat to aquaculture activities Texte intégral
2019
Almandoz, Gaston Osvaldo | Cefarelli, Adrián Oscar | Diodato, Soledad Lorena | Montoya, Nora Gladys | Benavides, Hugo R. | Carignan, Mario Osvaldo | Hernando, Marcelo Pablo | Fabro Cerreia Fus, Elena Ines | Metfies, Katja | Lundholm, Nina | Schloss, Irene Ruth | Álvarez, Marcela | Ferrario, Martha Elba
The Beagle Channel is a remote subantarctic environment where mussel aquaculture initiatives have existedsince the early 1990s. Here we analyze phytoplankton biomass and composition, and the occurrence of harmfulmicroalgae species and their toxins at three sites during the period 2015?2016. The occurrence of potentiallyharmful algae was observed throughout the study period, including toxigenic dinoflagellates such asAlexandrium catenella (Group I of the A. tamarense complex), A. ostenfeldii, Dinophysis acuminata, Gonyaulaxspinifera, Azadinium sp., and the diatoms Pseudo-nitzschia australis and P. fraudulenta. Toxic dinoflagellates weredetected in low densities whereas a Pseudo-nitzschia bloom was observed in late February. Isolates of A. catenellaand P. delicatissima sensu stricto were phylogenetically characterized. The toxin profile of A. catenella wasdominated by GTX4, while P. delicatissima sensu stricto showed no production of the neurotoxin domoic acid inculture conditions. The results provide base-line information for the management of harmful algal blooms in thislittle explored subantarctic area. | Fil: Almandoz, Gaston Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina | Fil: Cefarelli, Adrián Oscar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro de Investigaciones y Transferencia Golfo San Jorge. Centro de Investigaciones y Transferencia Golfo San Jorge: Sede Caleta Olivia - Santa Cruz | Universidad Nacional de la Patagonia Austral. Centro de Investigaciones y Transferencia Golfo San Jorge. Centro de Investigaciones y Transferencia Golfo San Jorge: Sede Caleta Olivia - Santa Cruz | Universidad Nacional de la Patagonia "san Juan Bosco". Centro de Investigaciones y Transferencia Golfo San Jorge. Centro de Investigaciones y Transferencia Golfo San Jorge: Sede Caleta Olivia - Santa Cruz; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Instituto de Desarrollo Costero; Argentina | Fil: Diodato, Soledad Lorena. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina | Fil: Montoya, Nora Gladys. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina | Fil: Benavides, Hugo R.. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina | Fil: Carignan, Mario Osvaldo. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina | Fil: Hernando, Marcelo Pablo. Comisión Nacional de Energía Atómica; Argentina | Fil: Fabro Cerreia Fus, Elena Ines. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina | Fil: Metfies, Katja. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung; Alemania | Fil: Lundholm, Nina. Universidad de Copenhagen; Dinamarca | Fil: Schloss, Irene Ruth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina | Fil: Álvarez, Marcela. Instituto Nacional de Investigaciones y Desarrollo Pesquero. Dirección de Pesquerías Demersales. Programa Pesquerías de Peces Demersales Costeros; Argentina | Fil: Ferrario, Martha Elba. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina
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