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Darriba S.,Instituto Tecnoloxico Para O Control Do Medio Marino Of Galicia Intecmar | Rodriguez R.,Estacion de Ciencias Marinas de Toralla ECIMAT
Diseases of Aquatic Organisms | Year: 2015

This paper reports the results of the survey developed after the first detection of protozoan Marteilia sp. infection of the grooved razor shell Solen marginatus (Pulteney, 1799) from Galicia (NW Spain) in 2006. Furthermore, we analysed other parasites and pathological conditions found in grooved razor shell populations throughout this survey, such as metacercariae of trematodes, prokaryotic infections and disseminated neoplasms, some of which could cause moderate or severe damage to the host depending on the intensity of infection. A total of 17 natural beds distributed along the Galician coast were analysed, and Marteilia sp. was detected in 6 of them with low prevalence, moderate intensity and no negative effects over the populations. © Inter-Research 2015. Source


Darriba S.,Instituto Tecnoloxico Para O Control Do Medio Marino Of Galicia Intecmar | Rodriguez R.,Estacion de Ciencias Marinas de Toralla ECIMAT | Lee R.,Consello Regulador do Mexillon de Galicia
Diseases of Aquatic Organisms | Year: 2011

During a histological survey of razor clam Ensis arcuatus (Jeffreys, 1865) from Galicia (NW Spain), basophilic inclusion bodies were observed in epithelial cells of the digestive gland. Transmission electron microscopy revealed the intranuclear position of these inclusions containing viral particles with icosahedral symmetry. Size and symmetry of these unenveloped virus particles suggest similarities to the families Papillomaviridae and Polyomaviridae which have been described as causing a viral gametocytic hypertrophy in oysters Crassostrea virginica and C. gigas. This is the first report of viral particles in E. arcuatus. © Inter-Research 2011. Source


Mhadhbi L.,Estacion de Ciencias Marinas de Toralla ECIMAT | Fumega J.,FARO | Beiras R.,Estacion de Ciencias Marinas de Toralla ECIMAT
Water, Air, and Soil Pollution | Year: 2012

Polybrominated diphenyl ethers (PBDEs) are highly persistent anthropogenic contaminants found in trace amounts in many environmental compartments far from their source areas, posing a risk to aquatic ecosystems. Our objective was to determine the relative toxicities of three BDEs, BDE-47, BDE-99 and BDE-154 on marine phytoplankton algae Isochrysis galbana. For a highly sensitive endpoint: the 72-h inhibition of autotrophic growth rate was calculated according to standards methods. Actual PBDE concentration was measured by GC-MS and toxicity parameters were calculated on the basis of time-weighted mean actual concentrations. No observable effect concentration (NOEC) values were 2.53 μg L -1 for BDE-47, 3.48 μg L -1 for BDE-99 and 12.3 μg L -1 for BDE-154, and LOEC values were 5.06, 6.96 and 24.60 μg L -1 for BDE-47, BDE-99 and BDE-154, respectively. The calculated IC 10 (the concentration inhibiting growth rate by 10 %) corresponded to 9.3, 12.78 and 54.6 μg L -1 for BDE-47, BDE-99 and BDE-154, respectively. The 50 % inhibitions of growth rate (IC 50) values were: 25.7 μg L -1 BDE-47, 30.0 μg L -1 BDE-99 and 243.7 μg L -1 BDE-154. Therefore, the acute toxicity of PBDEs decreases as the degree of bromination increases, the order of toxicity is BDE-47∈>∈BDE-99∈>∈BDE-154. Significant (p∈<∈0.05) adverse effects were observed for all compounds at concentrations >15 μg L -1. Our results indicated that under laboratory conditions PBDEs inhibited the growth of marine phytoplankton at concentrations near 10 μg L -1. However, further work is required to investigate long-term effects in these and other aquatic organisms. © 2012 Springer Science+Business Media B.V. Source


Mhadhbi L.,Estacion de Ciencias Marinas de Toralla ECIMAT | Mhadhbi L.,University of Carthage | Beiras R.,Estacion de Ciencias Marinas de Toralla ECIMAT
Water, Air, and Soil Pollution | Year: 2012

The present study evaluated the short-term toxicity of seven selected pesticides: four insecticides (chlorpyrifos, dieldrin, diazinon and pirimiphosmethyl) and three herbicides (diuron, alachlor and atrazine). With this aim, a standard toxicity test with the highly sensitive early life stages (ELS) of a marine fish was used. The turbot, Psetta maxima, is abundant in shallow estuarine and costal habitats and is currently the most commonly cultivated fish species in Galicia, NW Spain. According to the turbot ELS test results, chlorpyrifos was the most toxic pesticide tested for both embryos and larvae and was followed in order of decreasing toxicity by dieldrin, pirimiphos-methyl, diazinon, alachlor, atrazine and diuron. Larvae were more sensitive than embryos to the seven pesticides. The median lethal concentrations of the selected pesticides during a 48- and a 96-h exposure for turbot embryos and larvae were, respectively (in micrograms per litre): chlorpyrifos, 116.6 and 94.65; dieldrin, 146 and 97; pirimiphos-methyl, 560 and 452; diazinon, 1,837 and 1,230; alachlor, 2,177 and 2,233; diuron, 10,076 and 7,826; and atrazine, 11,873 and 9,957. According to their acute toxicity, the insecticides were more toxic than the herbicides. Furthermore, all insecticides and herbicides appear to be teratogenic to turbot ELS. © Springer Science+Business Media B.V. 2012. Source

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