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Natural variability of lotic Mediterranean ecosystems or wildfire perturbations...
Pinto, Paulo; Ferreira, Maria Teresa; Caraça, Rute; Pedro, Ana; Novais, Maria Helena; Morais, Manuela; Robinsons, C. T.This study evaluates the impacts of wildfires in lotic Mediterranean ecosystems. It was carried out at Monchique ridge after big wildfires occurred during 2002 and 2003. Deferential impacts were evaluated comparing historical results obtained before the wildfires (1999 and 2001), with the post fire ones (2006 and 2007). Physical and chemical parameters of the water, habitat morphology, diatoms, macrophytes, mac...
Diatom assemblages in Portuguese temporary rivers
Novais, Maria Helena; Morais, Manuela; Hoffmann, Lucien; Ector, LucDuring a survey of benthic diatoms in watercourses from Portugal in spring and summer 2006 and 2007, 76 sites in temporary streams (according to the National Water Institute classification) have been studied. These streams belong to the Ribeiras do Algarve (10 sites), Guadiana (19 sites), Mira (7 sites), Sado (16 sites), Tejo (20 sites), and Douro (4 sites) watersheds. Among these 76 sites, the National Water I...
MORPHOLOGICAL DIVERSITY WITHIN THE ACHNANTHIDIUM MINUTISSIMUM SPECIES COMPLEX
Novais, Maria Helena; Ector, Luc; Vijver, Bart Van de; Morais, Manuela; Hoffmann, LucienDuring a survey of benthic diatoms sampled in watercourses from Mainland Portugal, several Achnanthidium populations morphologically ascribable to the A. minutissimum complex have been found. They clearly belong to the genus Achnanthidium on the basis of the valve outline, radiate striae, uniseriate, wider spaced striae in the centre of the valve and cells shallow‐V‐shaped in girdle view. The raphe valve has a ...
Diversité des espèces du complexe Achnanthidium minutissimum : comparaison morp...
Novais, Maria Helena; Ector, Luc; Van de Vijver, Bert; Morais, Manuela; Hoffmann, LucienLors d’un suivi des diatomées benthiques des cours d'eau du Portugal en 2006-2007, plusieurs populations appartenant au complexe d’espèces autour d’Achnanthidium minutissimum ont été trouvées. Ces taxons appartiennent au genre Achnanthidium et sont définis par les caractères suivants : forme lancéolée des valves ; stries radiantes, unisériées, écartées au centre de la valve; frustules coudés en vue connective ;...
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