Encontrados 5 documentos, a visualizar página 1 de 1
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...
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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