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Registros recuperados: 28
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Alterações morfológicas da brânquia de Mugil causadas pela exposição de metais pesados na lagoa de Esmoriz-Paramos, Portugal IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Monteiro, Sandra Mariza; Salgado, Maria Antónia.
Tipo: ConferenceObject
Ano: 2005 URL: http://hdl.handle.net/10198/3935
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Avaliação do potencial algicida/algistático de extractos de plantas em microalgas (Chlorophta e Cyanophyta) IPB - Escola Superior Agrária
Barros, Sandra; Geraldes, Ana Maria; Ramos, Antonieta; Galhano, Victor; Fernandes, Conceição.
Devido à eutrofização, os sistemas aquáticos podem apresentar um desenvolvimento excessivo de fitoplâncton e algas filamentosas, com a concomitante diminuição da qualidade da água.. Para mitigar os problemas ambientais e económicos resultantes, têm sido implementadas medidas que abrangem a aplicação de algicidas e a redução do input de nutrientes. Contudo, alguns algicidas convencionais apresentam certas limitações, já que são tóxicos, a sua eficiência é discutível, e apresentam persistência no ambiente. A utilização de extractos vegetais poderá ser uma alternativa aos algicidas convencionais. O objectivo deste trabalho foi testar a actividade algicida e/ou algistática de extractos de plantas, recolhidas em Bragança, em dois tipos de microalgas.
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3842
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Avaliação do potencial algicida/algistático de extractos vegetais em microalgas (Chlorophta e Cyanophyta) IPB - Escola Superior Agrária
Barros, Sandra; Geraldes, Ana Maria; Ramos, A,; Galhano, Victor; Fernandes, Conceição.
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3850
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Bioaccumulation of heavy metals in Liza saliens from the Esmoriz-Paramos coastal lagoon, Portugal IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Peixoto, Francisco; Salgado, Maria Antónia.
Heavy metal (Cu and Zn) concentrations in liver, gills, and muscle of leaping grey mullet, Liza saliens, from the Portuguese Esmoriz–Paramos coastal lagoon were measured to evaluate their bioaccumulation as a function of sediment contamination. The highest metal concentrations were observed in the liver (254mg Cu kg 1) and gills (114 mgZn kg 1). Bioaccumulation factors (BAFs) were found to follow the order: Cu-liver4Cu-gills4Cu-muscle and Zn-gills4Zn-liver4Zn-muscle. The highest BAFs were observed in the organs mainly implicated in metal metabolism and a significant positive relationship was found between BAFs and fish age. These results suggest the loss of homeostatic capacity of L. saliens under chronic metal exposure leading to bioaccumulation....
Tipo: Article Palavras-chave: Bioaccumulation; Chronic exposure Heavy metals Liza saliens.
Ano: 2007 URL: http://hdl.handle.net/10198/3936
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Bioaccumulation of metals by Mugil saliens under chronic exposure to contamined sediments: Gill histopathological changes IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Monteiro, M.; Salgado, M.A..
The Esmoriz/Paramos coastal lagoon, is a habitat of ecological importance due to the presence of unique animal and plant species. During the past few years its immersed area has been gradually reduced due to effluent discharges and siltation. The major contaminants in the lagoon are derived from a multitude of nonpoint sources associated with urbanization and industrial activities within the watershed. Heavy metals are probably a class of pollutants contributing to the observed decline of fish species. The metal content in the water and sediments in the lagoon were investigated as well as gill metal bioaccumulation and gill histopathological changes of the grey leaping mullet, Mugil saliens.
Tipo: ConferenceObject Palavras-chave: Chronic exposure; Mugil saliens; Gill histopathology; Copper; Zinc.
Ano: 2005 URL: http://hdl.handle.net/10198/6012
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Biochemical blood parameters: are they effective biomarkers of chronic toxicity? IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Coimbra, A.; Saavedra, M.J.; Salgado, Maria Antónia.
The use of biomarkers has become attractive and useful for monitoring environmental quality and health of fish inhabiting polluted ecosystems. Among them, plasmatic biochemical parameters could be a promissory indicator of fish health condition. The question that arises is if these parameters can be applied to chronic toxicity. In this study we investigated the use of plasmatic biochemical parameters as indicators of fish chronic exposure to metals. Mullets (Liza saliens), inhabiting a metal polluted habitat, a small coastal lagoon Esmoriz-Paramos (Northwest coast, Portugal), showed alterations of plasmatic parameters related with Cu and Zn bioaccumulation in tissues. The effect of metals chronic exposure in plasmatic parameters is scarcely studied and...
Tipo: ConferenceObject Palavras-chave: Blood parameters; Biomarkers; Chronic toxicity.
Ano: 2009 URL: http://hdl.handle.net/10198/3843
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Can fish adopt the same defence strategy in gill and liver to face chronic metal exposure? IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Carrola, J.S.; Salgado, Maria Antónia.
Tipo: ConferenceObject
Ano: 2008 URL: http://hdl.handle.net/10198/3835
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Changes in plasma electrolytes and gill histopathology in wild Liza saliens from the Esmoriz-Paramos coastal lagoon, Portugal IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Monteiro, S.M.; Salgado, Maria Antónia.
The Esmoriz-Paramos is a lagoon of great ecological significance located on the Northwest coast of Portugal. The quality of water and sediment within this ecosystem has been gradually degraded due to the discharges of mostly untreated industrial waste and domestic sewage. Contaminants include heavy metals that can be taken up by fish from water, food, sediments, and suspended particulate material. Fish inhabiting polluted water bodies tend to accumulate many chemicals in high concentrations, even when the environmental contamination levels are low (Colombo et al. 1995). The leaping grey mullet (Liza saliens) is one of a few dominant species living in this environment. This species may contact xenobiotics in the water column or, when feeding, in the...
Tipo: Article
Ano: 2007 URL: http://hdl.handle.net/10198/3227
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Contaminação da Barrinha de Esmoriz/Lagoa de Paramos por metais pesados: Efeitos bioquímicos e histológicos em Liza saliens. IPB - Escola Superior Agrária
Fernandes, Conceição.
O presente trabalho centrou os seus objectivos na análise de alguns parâmetros químicos, bioquímicos, hematológicos e histológicos em tainha, Liza saliens, como medida do impacto da exposição crónica a metais pesados na Barrinha de Esmoriz/Lagoa de Paramos. Neste laguna costeira a contaminação por metais pesados é uma preocupação porque são poluentes que apresentam ao mesmo tempo persistência, capacidade de bioacumulação e toxicidade. A análise das concentrações totais de metais pesados (Cr, Cu, Pb e Zn), na água e nos sedimentos da Barrinha de Esmoriz/Lagoa de Paramos, mostrou que a ordem relativa de contaminação foi “Zn > Cu ~ Pb > Cr”. Nos sedimentos as concentrações de metais foram muito superiores às da água e a média por estrato de profundidade...
Tipo: DoctoralThesis
Ano: 2007 URL: http://hdl.handle.net/10198/3833
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Fish liver size and CAT activity: are they related to metals bioaccumulation? IPB - Escola Superior Agrária
Salgado, Maria Antónia; Fernandes, Conceição; Fontaínhas-Fernandes, A.; Ferreira, M.; Cortez, A..
Tipo: ConferenceObject
Ano: 2007 URL: http://hdl.handle.net/10198/5770
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Heavy metal contamination in a mugil wild population of a coastal lagoon IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Cabral, David; Carrola, J.S.; Salgado, Maria Antónia.
Polluted sediments usualy contain complex chemical mistures that may have synergistic and/or antagonistic effects on target organisms. Establishing causality in the 1ieId, is thus, particularly difficulty and the biomarker responses recorded in whole sediment toxicity assays are o correlactive nature only
Tipo: ConferenceObject
Ano: 2005 URL: http://hdl.handle.net/10198/3834
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Heavy metals in water, sediment and tissues of Liza saliens from Esmoriz-Paramos, Portugal. IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Cabral, David; Salgado, Maria Antónia.
Esmoriz–Paramos lagoon is an ecosystem of great ecological importance that is located on the northwest coast of Portugal and has been degraded as a result of industrial and anthropogenic activities. Concentrations of heavy metals (Cr, Cu, Pb and Zn) were measured in water, sediment and in tissues (liver and muscle) of Liza saliens, which is the dominant fish from the lagoon. Comparisons between metal concentrations in water and sediments were made with those in tissues of fish caught at the lagoon. Metals in water were quantified predominantly bound to particulate and equalled or exceeded the limit of chronic reference values. Metal concentrations in sediments varied among sampled sites. The relative order of concentrations was “Zn>Cu∼Pb>Cr” the same...
Tipo: Article Palavras-chave: Esmoriz–Paramos; Heavy metals; Sediment; Water; Fish.
Ano: 2008 URL: http://hdl.handle.net/10198/3937
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Histopathological gill changes in wild leaping grey mullet (Liza saliens) from the Esmoriz-Paramos coastal lagoon, Portugal IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Monteiro, Sandra Mariza; Salgado, Maria Antónia.
The histopathological changes are among the most recognized responses to environmental stressors, namely heavy metals. Liza saliens were sampled, in the Portuguese Esmoriz-Paramos coastal lagoon to assess their gill histopathological response to Cu and Zn contaminated sediments. A lesion prevalence index, severity, and extension scores of each lesion, as well as an assessment value (severity extension), were determined to evaluate the effect of environmental heavy metal exposure. The main histopathological changes observed were aneurisms, hyperplasia, lifting, and vasodilation. A high prevalence for each lesion (65–85%) was found, in addition to a high number of simultaneous lesions. Vasodilation and hyperplasia were the lesions that showed higher...
Tipo: Article Palavras-chave: Histopathological changes; Gill; Metals; Liza saliens.
Ano: 2007 URL: http://hdl.handle.net/10198/3934
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Liver histopathological assessment in wild mullet chronically exposed to Cu and Zn IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Salgado, Maria Antónia.
Tipo: ConferenceObject
Ano: 2008 URL: http://hdl.handle.net/10198/3836
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Metabolic and structural role of major fish organs as an early warning system in population assessment IPB - Escola Superior Agrária
Fernandes, Conceição; Afonso, A.; Salgado, M.A..
There are thousands of pollutants that affect aquatic environment and their effects have long been a concern and cause of research. This number grows annually since new compounds and formulations are synthesized. At present the concept of pollution involves knowledge of environmental fate and effects of chemical pollutants and their impacts on both, ecosystems and on social and economic development. Some aquatic environments are vital because of their critical ecological and economic importance. There are numerous lakes, lagoons and coastal lagoons playing a social and economic role on adjacent human populations, as they support fishing and recreational activities, and an ecological role, as they also support a characteristic flora and fauna, becoming...
Tipo: BookPart
Ano: 2011 URL: http://hdl.handle.net/10198/6057
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Metabolic mechanisms of adaptation to chronic metal exposure: a case study IPB - Escola Superior Agrária
Fernandes, Conceição; Salgado, M.A.; Fontainhas-Fernandes, A..
Metals are contaminants of great concern due to their persistence and potential toxic effects. Some heavy metals like lead have no function in biological systems, while others such as copper and zinc are essential for metabolism of living organisms, including fish. Nevertheless they may exert harmful effects, depending upon concentration. Fish can be exposed to trace metals via two main exposure routes, waterborne and dietary and their accumulation can reach high concentrations, with time of exposure, even when the environmental contamination levels are low. Toxicity of trace metals to fish is strongly dependent upon abiotic and biotic factors that influence metal uptake and bioaccumulation. Some fish species have demonstrated the ability to inhabit...
Tipo: BookPart
Ano: 2008 URL: http://hdl.handle.net/10198/6056
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Monitoring pollution in Esmoriz–Paramos lagoon, Portugal: liver histological and biochemical effects in Liza saliens IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Rocha, E.; Salgado, Maria Antónia.
The Esmoriz–Paramos lagoon is one important ecosystem located in the Northwest coast of Portugal. This study is concerned with the assessment of pollution of the lagoon contributed by urban, industrial and agricultural activities. The parameters selected for this aim were the occurrence of hepatic histological alterations and plasma blood biochemistry in Liza saliens, the dominant fish in this lagoon. Blood parameters were compared between mullets collected from the lagoon and from the sea and included plasma enzyme activities (aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP)), glucose (GLU) and total protein (TP).Apositive relationship between hepatocyte vacuolization index and hepatosomatic index was found,...
Tipo: Article Palavras-chave: Hepatic lesions .; Plasma transaminases; Heavy metals; Chronic exposure ..
Ano: 2008 URL: http://hdl.handle.net/10198/3228
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Mullet chronic exposure to Cu and Zn: liver histhopatological assessment and metabolic enzyme activities IPB - Escola Superior Agrária
Salgado, Maria Antónia; Fernandes, Conceição; Fontaínhas-Fernandes, A.; Rocha, E..
Tipo: ConferenceObject
Ano: 2007 URL: http://hdl.handle.net/10198/5771
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Osmotolerância em leveduras IPB - Escola Superior Agrária
Fernandes, Conceição; Rocha, Amélia; Estevinho, Leticia M..
No presente trabalho, seleccionaram-se diferentes estirpes de leveduras para testar a sensibilidade ao cloreto de sódio (NaCI). As estirpes usadas foram Saccharomyces cerevisiae ESAl, Candida utiJis ESA 2L Zygosaccharomyces bailii ISA 1307, Zygosaccharomyces rouxii ESA 18 e Candida pelliculosa ESA 16, tendo sido estimadas a taxa específica de crescimento (Kc) e a produção de biomassa na ausência e na presença de sal.
Tipo: ConferenceObject
Ano: 2000 URL: http://hdl.handle.net/10198/5820
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Oxidative stress enzymes and mitochondrial bioenergetics in wild Liza saliens exposed to heavy metals IPB - Escola Superior Agrária
Fernandes, Conceição; Fontainhas-Fernandes, A.; Peixoto, F.P.; Salgado, M.A..
The Esmoriz-Paramos coastal lagoon represents an ecosystem of great physical and ecological significance. However, as a result of industrial, agricultural and antropogenic activities this habitat has been progressively degrading over the last decades. The heavy metal contamination is an important factor to the decline of sediments quality and may adversely affect fish health. In the present work the leaping grey mullet Liza saliens was studied because it is the dominant endemic species in the lagoon. It is a filter feeder and also being a detritus-mud feeder, it is therefore exposed to contaminated sediments.
Tipo: ConferenceObject
Ano: 2006 URL: http://hdl.handle.net/10198/6001
Registros recuperados: 28
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