Encontrados 14 documentos, a visualizar página 1 de 2
Influence of benthic macroinvertebrates on the erodability of estuarine cohesiv...
Kristensen, Erik; Neto, João Magalhães; Lundkvist, Morten; Frederiksen, Lars; Pardal, Miguel Ângelo; Valdemarsen, Thomas; Flindt, Mogens ReneThe impact of three dominating benthic invertebrates on sediment stability and erosion conditions of cohesive sediments in the Mondego Estuary, Portugal, was examined in laboratory annular flume experiments. The purpose was to test how the life habits and body size of the three involved species (Hydrobia ulvae, Nereis diversicolor and Scrobicularia plana) in terms of density or biomass influence sediment erosio...
Impact of climate variability on ichthyoplankton communities: An example of a s...
Primo, Ana Lígia; Azeiteiro, Ulisses Miranda; Marques, Sónia Cotrim; Pardal, Miguel ÂngeloRecent variations in the precipitation regime across southern Europe have led to changes in river fluxes and salinity gradients affecting biological communities in most rivers and estuaries. A sampling programme was developed in the Mondego estuary, Portugal, from January 2003 to December 2008 at five distinct sampling stations to evaluate spatial, seasonal and inter-annual distributions of fish larvae. Gobiida...
Changes in zooplankton diversity and distribution pattern under varying precipi...
Primo, Ana Lígia; Azeiteiro, Ulisses Miranda; Marques, Sónia Cotrim; Martinho, Filipe; Pardal, Miguel Ângelohttp://www.sciencedirect.com/science/article/B6WDV-4VGF3YJ-5/2/0532a272b92cfc2de9a24d92edc5265b
Ecological relationships between phytoplankton communities and different spatia...
Cabecinha, Edna; Van den Brink, Paul J.; Cabral, João Alexandre; Cortes, Rui; Lourenço, Martinho; Pardal, Miguel ÂngeloPhytoplankton communities are structured by factors acting over temporal and spatial scales. Identifying which factors are driving spatial patterns in aquatic communities is the central aim of ecology. In this study, data sets of phytoplankton communities and nvironmental data of two Portuguese servoirs types (lowland ‘‘riverine reservoirs’’ and higher altitude ‘‘artificial lake reservoirs’’) were used to dete...
Multi-scale approach using phytoplankton as a first step towards the definition...
Cabecinha, Edna; Cortes, Rui; Cabral, João Alexandre; Ferreira, Teresa; Lourenço, Martinho; Pardal, Miguel ÂngeloThe growing need to analyse the present state of ecosystems and predict their rate of change has triggered a demand to explore species environment relationships for assessing alterations under anthropogenic influence. The Water Framework Directive (WFD) requires the definition of different types of water bodies which are of relevance when assessing their ecological status. The main aim of this study was to defi...
Testing the Stochastic Dynamic Methodology (StDM) as a management tool in a sha...
Silva-Santos, Pedro; Pardal, Miguel Ângelo; Lopes, Ricardo Jorge; Múrias, Tiago; Cabral, João AlexandreA long-term monitoring program has been carried out since the early 1990s in the Mondego estuary, on Portugal's west coast, which is presently under heavy human pressure. In this shallow warm-temperate estuary, a significant macroalgal proliferation has been observed, which is a clear sign of nutrient enrichment. As a result of competition with algae, the extension of the seagrass meadows (mainly Zostera noltii...
Modelling nutrient mass balance in a temperate meso-tidal estuary: Implications...
Neto, João Magalhães; Flindt, Mogens René; Marques, João Carlos; Pardal, Miguel ÂngeloAlthough mitigation programmes have been implemented in huge eutrophied estuarine systems, satisfactory results are not always immediately achieved. External loadings are reduced but the nutrient pools still existing in the sediments (due to decades of external supply) start to deplete only slowly, to reach the lower steady state level related to the new external loading. In the Mondego Estuary, this situation ...
Climate variability and planktonic communities: The effect of an extreme event ...
Marques, Sónia Cotrim; Azeiteiro, Ulisses Miranda; Martinho, Filipe; Pardal, Miguel ÂngeloAs a consequence of climate change, flood and drought events are increasing in frequency throughout the world. Nevertheless, knowledge of the effects on zooplankton estuarine communities is still scarce. The present study aimed to examine zooplankton ecology over two contrasting environmental conditions: regular years and extreme dry years, in a shallow temperate southern European estuary, the Mondego Estuary (...
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 ...
A Stochastic Dynamic Methodology (SDM) to the modelling of trophic interactions...
Silva-Santos, Pedro; Pardal, Miguel Ângelo; Lopes, Ricardo Jorge; Múrias, Tiago; Cabral, João AlexandreIn the face of global change, declines in environmental quality are of increasing concern, especially in shallow coastal areas, densely populated and commonly affected by nutrient enrichment. The warm temperate Mondego estuary (Western Portugal), in common with many other shallow estuarine areas, is exhibiting increased macroalgal growth due to nutrient enrichment. The increase of macroalgal biomass and possibl...
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