1000 resultados para Paisajes andino amazónicos
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long-term cultural history of the Madriu-Perafita-Claror valleys (Andorra) and the Cadí Range (Catalonia) has been investigated thanks to the combination of archaeological surveys and excavation, analysis of written sources, multiproxy alaeoenvironment analysis (pollen, NPP, micro and macro charcoal, sedimentology and geochemistry), and digital technologies such as stereophotogrammetry, multispectral imaging, DGPS and GIS. The project has been designed from a landscape archaeology approach and the study area has been selected due to the suitable setting it provides for a meaningful application of the aforementioned techniques. Consequently, archaeological, historical and palaeoenvironmental data have been all treated as cultural proxies. Their comparison has allowed obtaining not only coherent but also complementary results. The project outcomes show an uninterrupted occupation of these high mountain valleys (2000-2600 m a.s.l.) from the Mesolithic until the present. This human occupation shows strong spatial and chronological variability in human practices ranging from a stable long term group occupation in the Late Neolithic to the diversification of representative practices during the Roman period (metallurgy, pine resin exploitation, charcoal production, pastoralism, etc.). This high diversity of activities leads to complex cultural landscapes in the high Pyrenean areas. The reconstruction of the cultural history at the study areas will allow the development of more sustainable politics for these landscapes management.
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We presented a bird-monitoring database inMediterranean landscapes (Catalonia, NE Spain) affected by wildfires and we evaluated: 1) the spatial and temporal variability in the bird community composition and 2) the influence of pre-fire habitat configuration in the composition of bird communities. The DINDIS database results fromthemonitoring of bird communities occupying all areas affected by large wildfires in Catalonia since 2000.We used bird surveys conducted from 2006 to 2009 and performed a principal components analysis to describe two main gradients of variation in the composition of bird communities, which were used as descriptors of bird communities in subsequent analyses. We then analysed the relationships of these community descriptors with bioclimatic regions within Catalonia, time since fire and pre-fire vegetation (forest or shrubland).We have conducted 1,918 bird surveys in 567 transects distributed in 56 burnt areas. Eight out of the twenty most common detected species have an unfavourable conservation status, most of them being associated to open-habitats. Both bird communities’ descriptors had a strong regional component and were related to pre-fire vegetation, and to a lesser extent to the time since fire.We came to the conclusion that the responses of bird communities to wildfires are heterogeneous, complex and context dependent. Large-scale monitoring datasets, such as DINDIS, might allow identifying factors acting at different spatial and temporal scales that affect the dynamics of species and communities, giving additional information on the causes under general trends observed using other monitoring systems
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La gestión y evaluación del paisaje exige la necesaria convergencia de disciplinas en aras de delimitar los valores que la propia sociedad otorga al paisaje. El establecimiento de metodologías de análisis de tipo cualitativo parece satisfacer, en la mayoría de los casos, las necesidades de la comunidad científica en relación con la catalogación del paisaje. Las dificultades surgen cuando lo que pretende es clasificar el paisaje a partir de indicadores más de tipo cualitativo, lo que implica, sin lugar a dudas, la búsqueda de disciplinas que aporten más luz al ya de por sí complejo estudio de los denominados como valores intangibles del paisaje. La Comunicología representa, en este sentido, un aporte disciplinario novedoso, sobre todo en el sentido de intentar habilitar un lenguaje del paisaje, a partir del cual fijar los cimientos de su interpretación simbólica e identitaria. Así, las contribuciones teóricas del interaccionismo simbólico, de la ecología humana, de la psicología cognitiva o de la semiótica visual, entre otras, permiten vislumbrar las posibilidades de estudio del paisaje desde un punto de vista comunicológico. En este ensayo se sitúan los indicadores de evaluación de los paisajes en la órbita de la aportación disciplinar de la Comunicología. De ahí se abre un horizonte de posibilidades infinitas para el que se podría denominar como “abordaje comunicológico del paisaje”, con especiales sinergias en la concepción del paisaje como elemento activo de comunicación.
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A final 241 µM of ascorbyl palmitate and 555 µM of the following antioxidants separately: BHA, myricetin and quercetin standards, and extracts of Byrsonima crassifolia, Inga edulis or Euterpe oleracea, were added to crude açai oil and submitted to the oxidation process at 60 ºC for 11 days. Among the antioxidants used, only the myricetin standard showed the ability to defer the oxidation process until the third day of treatment. B. crassifolia, I. edulis and E. oleracea extracts showed no preventive capacity against the oxidation process, despite their high concentration phenolic compounds and antioxidant activities.
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Foi estudada a estabilidade química e microbiológica de "minced fish" produzidos, em condições industriais, com espécies de peixes da Amazônia: aracú-comum (Schizodon fasciatus), branquinha-comum (Potamorhina latior), branquinha-de-cabeça-lisa (P. altamazonica), curimatã (Prochilodus nigricans), jaraqui-de-escama-fina (Semaprochilodus taeniurus), jaraqui-de-escama-grossa (S. insignis), mapará (Hypophthalmus edentatus), pacú-comum (Metynnis hypsauchen), pacú-manteiga (Mylossoma duriventre) e pirapitinga (Piaractus brachypomum), durante 150 dias sob congelamento a -18±1°C e -36±1°C. Com base no pH, nitrogênio das bases voláteis totais (N-BVT), substâncias reagentes ao ácido tiobarbitúrico (TBARS) e contagens de aeróbios mesófilos a 35°C e psicrotróficos a 7°C, e de coliformes totais e fecais (NMP), os "minced fish" obtidos a partir das espécies de peixes estudadas e de misturas de espécies (aracú+curimatã+pirapitinga; jaraqui+branquinha) mantiveram-se em condições de consumo, durante o período experimental. Os resultados obtidos são altamente promissores sob o ponto de vista tecnológico.
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