Encontrados 5 documentos, a visualizar página 1 de 1
Do climate and soil influence phenotypic variability in leaf litter, microbial ...
Graça, M. A. S.; Poquet, J. M.We tested the hypothesis that water stress and soil nutrient availability drive leaf-litter quality for decomposers and detritivores by relating chemical and physical leaf-litter properties and decomposability of Alnus glutinosa and Quercus robur, sampled together with edaphic parameters, across wide European climatic gradients. By regressing principal components analysis of leaf traits [N, P, condensed tannins...
Water quality assessment of Portuguese streams: Regional or national predictive...
Feio, M. J.; Norris, R. H.; Graça, M. A. S.; Nichols, S.http://www.sciencedirect.com/science/article/B6W87-4TY8WB4-2/2/5bab94f8490387f7a8da832e49003d6b
Diversity and activity of aquatic fungi under low oxygen conditions
Medeiros, A. O.; Pascoal, C.; Graça, M. A. S.1. The objective was to test whether a decrease in oxygen concentration in streams affects the diversity and activity of aquatic hyphomycetes and consequently leaf litter decomposition. 2. Senescent leaves of Alnus glutinosa were immersed for 7 days in a reference stream, for fungal colonization, and then incubated for 18 days in microcosms at five oxygen concentrations (4%, 26%, 54%, 76% and 94% saturation). L...
Food consumption by the larvae of Sericostoma vittatum (Trichoptera), an endemi...
Feio, M. J.; Graça, M. A. S.The caddisfly Sericostoma vittatum Rambur (Trichoptera: Sericostomatidae) is an endemic species of the Iberian Peninsula. Under laboratory conditions, larvae of S. vittatum had a higher activity and metabolism during the night. Besides consuming particulate allochthonous organic matter, young stages are also able to feed and grow on faecal pellets from adults. Daily growth rates varied from 0.02 mg (0.8–3.7 mg ...
The elaboration of indices to assess biological water quality. A case study
Graça, M. A. S.; Coimbra, C. N.Here we tested the application of a nodal analysis for the elaboration of biotic indices for particular stressing conditions. The work was carried out in an intermittent Mediterranean stream where superficial flow was absent during summer. The river was perturbed by an effluent with high pH, sulphates, nitrates and conductivity. "Summer" and "winter" samples were treated separately. We first identified groups o...
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