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Diatom assemblages in Portuguese temporary rivers

Novais, Maria Helena; Morais, Manuela; Hoffmann, Lucien; Ector, Luc

During 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, Lucien

During 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, Lucien

Lors 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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