Encontrados 9 documentos, a visualizar página 1 de 1
Development and validation of an experimental life support system for assessing...
Coelho, Francisco J. R. C.; Rocha, Rui J. M.; Pires, Ana C. C.; Ladeiro, Bruno; Castanheira, José M.; Costa, Rodrigo; Almeida, Adelaide; Cunha, ÂngelaAn experimental life support system (ELSS) was constructed to study the interactive effects of multiple stressors on coastal and estuarine benthic communities, specifically perturbations driven by global climate change and anthropogenic environmental contamination. The ELSS allows researchers to control salinity, pH, temperature, ultraviolet radiation (UVR), tidal rhythms and exposure to selected contaminants. ...
Heavy metal accumulation in Halimione portulacoides: Intra- and extra-cellular ...
Sousa, Ana I.; Caçador, Isabel; Lillebø, Ana I.; Pardal, Miguel A.Salt marsh plants can sequestrate and inherently tolerate high metal concentrations found in salt marsh sediments. This work intended to understand the Halimione portulacoides (L.) Aellen strategies to prevent metal toxicity, by investigating the metal location in different plant organs and in the cell. A sequential extraction was performed on leaves, stems and roots of H. portulacoides in order to determine an...
Contribution of Spartina maritima to the reduction of eutrophication in estuari...
Sousa, Ana I.; Lillebø, Ana I.; Caçador, Isabel; Pardal, Miguel A.http://www.sciencedirect.com/science/article/B6VB5-4T4WM2P-1/2/39c53246a441c97ea5fb560b5d7dd93a
Nutrient dynamics in Mediterranean temporary streams: A case study in Pardiela ...
Lillebø, Ana Isabel; Morais, Manuela; Guilherme, Pedro; Fonseca, Rita; Serafim, António; Neves, RamiroMost of the streams in the Mediterranean region are temporary, following predictable seasonal of flooding and drying, with a transition from lotic conditions to shallow lentic conditions. The goal of our study was to assess the nitrogen and phosphorus dynamics in channel-bed processes of temporary streams between floods. Results show that, during winter, temperatures ranged between 9.5 and 11.2 °C and oxygen co...
Spartina maritima influence on the dynamics of the phosphorus sedimentary cycle...
Lillebø, Ana; Coelho, J.; Flindt, M.; Jensen, H.; Marques, J.; Pedersen, C.; Pardal, M.Abstract During the last decades the Mondego estuary has been under severe ecological stress mainly caused by eutrophication. In this salt march system, Spartina maritima covers about 10.5 ha of the intertidal areas. The objective of the present study was to evaluate the effect of Spartina maritima marshes on the dynamics of phosphorus (P) binding in the surface sediment. We compare phosphate and oxygen fluxes...
Assessment of spatial environmental quality status in Ria de Aveiro (Portugal)
Lopes, Cláudia Batista; Pereira, Maria Eduarda; Vale, Carlos; Lillebø, Ana Isabel; Pardal, Miguel Ângelo; Duarte, Armando CostaThe productivity of Ria de Aveiro is sustained by the large quantities of dissolved inorganic nutrients, mainly from freshwater inputs (e.g. agricultural drainage) and organic-rich anthropogenic point sources (e.g. urban sewage). The concentration of silicate and nitrate showed a similar seasonal variation and conservative behaviour, since 63 to 96% of the total variance of the concentration of silicate and 88 ...
Population structure, dynamics and production of Hydrobia ulvae (Pennant) (Moll...
Lillebø, Ana Isabel; Pardal, Miguel Ângelo; Marques, João CarlosEutrophication in the Mondego estuary gave rise to qualitative changes in the benthic community, involving the replacement of eelgrass, Zostera noltii, by green algae such as Enteromorpha spp. and Ulva sp. It seems reasonable to assume that, through time, such changes may determine a selected new trophic structure. Hydrobia ulvae, a dominant species in terms of abundance and biomass, was studied with regard to ...
The effect of macrofauna, meiofauna and microfauna on the degradation of Sparti...
Lillebø, Ana Isabel; Flindt, Mogens R.; Pardal, Miguel Ângelo; Marques, João CarlosDecomposition of salt marsh plants results from physical, chemical and biological processes including abiotic and biotic fragmentation, microbial decay and chemical transformation. According to literature data, only a few species have the ability to feed directly on living plant material, so fungi and bacteria seem to be the principal competitors for the organic substrates. Nevertheless, by consuming bacteria, ...
Nutrient cycling and plant dynamics in estuaries: A brief review
Flindt, Mogens R.; Pardal, Miguel Ângelo; Lillebø, Ana Isabel; Martins, Irene; Marques, João CarlosEutrophication of European estuaries due to massive nutrient loading from urban areas and diffuse runoff from extensively cultivated land areas is analysed. Consequences for the ecology of estuaries, namely changes in plant species composition, which also affects heterotrophic organisms, are approached based on examples showing that the result is often a fundamental structural change of the ecosystem, from a gr...
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