Encontrados 6 documentos, a visualizar página 1 de 1
Behavioural responses of indigenous benthic invertebrates (Echinogammarus merid...
Macedo-Sousa, Joaquim A.; Gerhardt, Almut; Brett, Christopher M.A.; Nogueira, António J.A.; Soares, Amadeu M.V.M.The drainage of abandoned mines leads to several ecological problems, particularly the acidification of surface freshwater systems and heavy metal contamination. In order to study the possibility of using the behavioural early warning responses of Portuguese indigenous benthic invertebrates to detect an acute short-term pulse of Acid Mine Drainage (AMD), experiments with the Multispecies Freshwater Biomonitor M...
Acute and chronic effects of testosterone and 4-hydroxyandrostenedione to the c...
Barbosa, Isabel R.; Nogueira, António J. A.; Soares, Amadeu M. V. M.Steroid compounds have been globally detected in surface waters. The ecological impacts of these biologically active chemicals are largely unknown. Toxicity of testosterone and 4-hydroxyandrostenedione was assessed for the freshwater cladoceran Daphnia magna. Acute toxicity tests showed that 6.20 mg L-1 of testosterone, the highest concentration tested, did not have effect on the daphnids, whereas 4-hydroxyandr...
Ranging behaviour of translocated roe deer in a Mediterranean habitat: seasonal...
Carvalho, Pedro; Nogueira, António J. A.; Soares, Amadeu M. V. M.; Fonseca, CarlosIn this study we investigated the causes of seasonal variation in the home ranges of roe deer reintroduced to the Gardunha Mountains (Portugal). From May 2002 to April 2003, 1 year after the animals had been released, we collected data using radio-tracking techniques for five monitored animals (two males and three females). We found differences in the size of home ranges between seasons, with home ranges larger...
A microbial approach in soils from contaminated mine areas: The Jales mine (Por...
Loureiro, Susana; Nogueira, António J. A.; Soares, Amadeu M. V. M.Microorganisms play a crucial role in decomposition processes and nutrient cycling and, therefore, in soil quality. Soil enzymes have shown sensitivity to contaminants, such as heavy metals, due to their interaction with the specific reaction sites, thereby reducing the formation of the reaction products. In this study, several enzymatic bioassays were applied (dehydrogenase, acid phosphatase, arylsulfatase, ur...
Evaluation of the effects, on canopy arthropods, of two agricultural management...
Santos, Sónia A.P.; Pereira, J.A.; Torres, L.; Nogueira, António J. A.This study aims to investigate the effect of management regime on canopy arthropod community of the olive tree (Olea europaea L.). Field studies were performed in two successive years, 2002 and 2003, in two olive groves, one under organic farming and the other under integrated protection. The integrated protection grove was sprayed once a year in June, with dimethoate, to control the anthophagous generation of ...
Bioaccumulation and elimination of 14C-lindane by Enchytraeus albidus in artifi...
Amorim, Mónica João de Barros; Sousa, José Paulo; Nogueira, António J. A.; Soares, Amadeu M. V. M.http://www.sciencedirect.com/science/article/B6V74-46M5B4P-K/1/3a3b739c975b196cf18bd0a44065258a
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