Encontrados 13 documentos, a visualizar página 1 de 2
Structural and functional responses of benthic invertebrates to imidacloprid in...
Pestana, J. L. T.; Alexander, A. C.; Culp, J. M.; Baird, D. J.; Cessna, A. J.; Soares, A. M. V. M.Structural and functional responses of a benthic macroinvertebrate assemblage to pulses of the insecticide imidacloprid were assessed in outdoor stream mesocosms. Imidacloprid pulses reduced invertebrate abundance and community diversity in imidacloprid-dosed streams compared to control streams. These results correlated well with effects of imidacloprid on leaf litter decomposition and feeding rates of Pteronar...
Phenotypic variation of Fucus ceranoides, F. spiralis and F. vesiculosus in a t...
Cairrão, E.; Pereira, M. J.; Morgado, F.; Nogueira, A. J. A.; Guilhermino, L.; Soares, A. M. V. M.Brown algae includes several species of Fucus, reported both in the tidal and intertidal zones of cold and temperate regions. Environmental parameters induce wide biological variability in intertidal algae, manifested by alterations at several levels, and this has lead to the failure of some reports to discriminate between closely related taxa, particularly Fucus species. As the genus Fucus is widely represente...
Endosulfan sulphate interferes with reproduction, embryonic development and sex...
Palma, P.; Palma, V. L.; Fernandes, R. M.; Soares, A. M. V. M.; Barbosa, I. R.Endosulfan sulphate is the transformation product of endosulfan and it is the most frequent form of surface water contamination with endosulfan. The aim of this study was to evaluate the possible effects promoted by endosulfan sulphate in changes on the life cycle, embryo development and sex differentiation of Daphnia magna. The endpoints used were moulting frequency, fecundity, growth, developmentally abnormal...
In Situ and Laboratory Microalgal Assays in the Tropics: A Microcosm Simulation...
Moreira-Santos, M.; Silva, E. M. da; Soares, A. M. V. M.; Ribeiro, R.Without Abstract ; http://dx.doi.org/10.1007/s00128-004-0546-2
Comparison between two lunar situations on emission and larval transport of dec...
Gonçalves, F.; Ribeiro, R.; Soares, A. M. V. M.This study compares the rhythms of larval release of the most abundant decapod crustaceans between the New Moon and the First Quarter. Eurelian field surveys were conducted at a small estuary (Mondego river) on the Atlantic coast of Portugal. All taxa showed tidal and lunar rhythm changes in abundance. The larval emission was very strong during nocturnal ebb neap tides at the First Quarter. Export of zoea did n...
Assessing the trophic state of Linhos lake: a first step towards ecological reh...
Pereira, R.; Soares, A. M. V. M.; Ribeiro, R.; Gonçalves, F.Lack of recognition of the value of wetlands has led to the loss of considerable areas of these ecosystems in the past. Linhos lake (Figueira da Foz, Portugal) is a good example of one of these ecosystems, in which human intervention was responsible for its environmental degradation and led to its precocious terrestrialization. Physico-chemical conditions and zooplankton community structure were studied in Linh...
Effect of Endosulfan and Parathion on Energy Reserves and Physiological Paramet...
Ribeiro, Sónia; Sousa, J. P.; Nogueira, A. J. A.; Soares, A. M. V. M.The in vivo effects of parathion and endosulfan on the isopod Porcellio dilatatus were investigated. Feeding parameters (food consumption and assimilation rates), growth, and energy reserves (glycogen, lipid, and protein contents) of pesticide-exposed isopods were compared with those of control animals. Isopods were exposed to a wide range of concentrations of parathion or endosulfan (0.1, 1, 10, 25, 50, 100, 2...
Yeasts as a model for assessing the toxicity of the fungicides Penconazol, Cymo...
Ribeiro, I. C.; Veríssimo, I.; Moniz, L.; Cardoso, H.; Sousa, M. J.; Soares, A. M. V. M.; Leão, C.In the present work the sensitivity of yeast strains of Kluyveromyces marxianus, Pichia anomala, Candida utilis, Schizosaccharomyces pombe and Saccharomyces cerevisiae, to the fungicides cymoxanil, penconazol, and dichlofluanid, was evaluated. Dichlofluanid induced the most negative effects, whereas penconazol in general was not very toxic. Overall, our results show that the parameters IC50 for specific respira...
Optimization of Culture Conditions of Porcellio dilatatus (Crustacea: Isopoda) ...
Caseiro, Isabel; Santos, S.; Sousa, J. P.; Nogueira, A. J. A.; Soares, A. M. V. M.This paper describes the experimental results for optimizing isopod culture conditions for terrestrial ecotoxicity testing. The influence of animal density and food quality on growth and reproduction of Porcellio dilatatus was investigated. Results indicate that density influences isopod performance in a significant way, with low-density cultures having a higher growth rate and better reproductive output than m...
Influence of Cellular Density on Determination of EC50 in Microalgal Growth Inh...
Moreno-Garrido, I.; Lubián, L. M.; Soares, A. M. V. M.Growth inhibition tests for copper were carried out on four marine microalgal species: Chlorella autotrophyca, Nannochloris atomus (Chlorophyceae), Phaeodactylum tricornutum (Bacillariophyceae), and Isochrysis aff. galbana (Primnesiophyceae). The test initial cellular densities were reduced to 50 and 10% from the recommended initial cellular density in most of standardized assays. OECD test protocol (originally...
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