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O campo na cidade: as hortas e os hortelões de Lisboa

Agricultural production faces a complex situation related to the unsustainability of many intensive agriculture, biodiversity losses and the necessary compatibilisation of agriculture and nature conservation, increasing use of soils to produce biofuels, decreasing availability at world level of good agricultural soils, climatic contingencies. As a result, prices of agricultural products rise. Apparently the era...

A Natureza, a Ideologia, o Sagrado

In a time of secularization, skepticism regarding ideologies, and general disenchantment, nature occupied a central place. In the context of the sacred-profane opposition of the cultural sociology, the sacred character of nature is briefly analyzed in relation to city vs. nature dichotomy, genetically modified organisms, organic food, and natural products. Nature is also the object of ideologies and social mov...

Paisagem e Natureza na arte contemporânea portuguesa

Texto do catálogo da Exposição Paisagem e Natureza na arte contemporânea portuguesa, Museu de Évora 12 dez 2013 - 02 fev 2014

Fish-based groups for ecological assessment in rivers: the importance of enviro...

The use of river-types is of practical value, serving as groups for which assessment procedures can be developed and applied. An abiotic typology was set by the Portuguese Water Agency, mainly based on 6 major morphoclimatic regions. However, to be biologically meaningful, this typology should fit the distribution patterns of the biological quality elements communities proposed in Water Framework Directive unde...

Effects of hydrological variability on fish assemblages in small Mediterranean ...

Small Mediterranean streams are shaped by predictable seasonal events of flooding and drying over an annual cycle, and present a strong inter and intra-annual variation in flow regime. Native fish assemblages in these streams are adapted to this natural evironmental variability. The distinction of human-induced disturbances from the natural ones is thus a crucial step before assessing the ecological status of t...

Effects of hydrological variability on fish assemblages in small Mediterranean ...

Small Mediterranean streams are shaped by predictable seasonal events of flooding and drying over an annual cycle, and present a strong inter and intra-annual variation in flow regime. Native fish assemblages in these streams are adapted to this natural environmental variability. The distinction of human-induced disturbances from the natural ones is thus a crucial step before assessing the ecological status of ...

Dispersal and coexistence of two non-native crayfish species (Pacifastacus leni...

NE Portugal is one of the most isolated and low populated regions of Western Europe. Recently, two American crayfish species reached this area: signal crayfish Pacifastacus leniusculus coming from Spain and red swamp crayfish Procambarus clarkii in its northward expansion. The dispersion of both species was followed throughout the last decade in river Maçãs (Douro catchment). Our results support the hypothesis ...

Manual para a avaliação biológica da qualidade da água em sistemas fluviais seg...

A Directiva nº 2000/60/CE do Parlamento Europeu e do Conselho, de 23 de Outubro de 2000 (Directiva Quadro da Água - DQA), transposta para a legislação nacional pela Lei da Água, Lei nº58/2005, de 29 de Dezembro e pelo Decreto-Lei nº77/2006, de 30 de Março, veio tornar mais premente a necessidade de, a nível nacional, se desenvolver um esforço de normalização quanto a métodos de amostragem de elementos de qualid...

Tipologia de rios em Portugal Continental no âmbito da implementação da Directi...

Os tipos são grupos de massas de água com características geográficas e hidrológicas relativamente homogéneas, consideradas relevantes para a determinação das condições ecológicas. O objectivo da definição de tipos é permitir que sejam correctamente estabelecidas condições de referência e que sejam comparáveis as classificações de estado ecológico dentro de cada grupo de rios com características semelhantes. Na...

Predation of invasive crayfish on aquatic vertebrates: the effect of Procambaru...