Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/3727

Title: Morphology and ecology of Achnanthidium caravelense (Bacillariophyceae), a new species from Portuguese rivers
Authors: NOVAIS, M.H.
HLÚBIKOVÁ, D.
MORAIS, M.
HOFFMANN, L.
ECTOR, L.
Editors: Chapman, Russell L.
Komárková, Jaroslava
Krienitz, habil. Lothar
Kristiansen, J.
Keywords: Achnanthidium caravelense
Achnanthidium eutrophilum
Bacillariophyceae
diatoms
ecology
morphology
new species
Portugal
ultrastructure
Issue Date: 2011
Publisher: Lucien Hoffmann
Citation: NOVAIS M. H., D. HLÚBIKOVÁ, M. MORAIS, L. HOFFMANN & L. ECTOR, 2011 - Morphology and ecology of Achnanthidium caravelensis (Bacillariophyceae), a new species from Portuguese rivers. Algological Studies, 136: 131-150
Abstract: A new benthic freshwater diatom species belonging to the genus Achnanthidium Kütz. has been recorded from several watercourses in the North of Portugal. Achnanthidium caravelense Novais et Ector is described as a new species based on light and scanning electron microscopic observations, as well as on its ecological preferences as reconstructed from field observations. The most characteristic morphological features of this species are the different outline of the raphe valve (narrowly elliptic with linear margins) and the rapheless valve (narrowly elliptic to narrowly rhombic with moderately convex margins), the non-protracted broadly rounded apices and the length/width ratio. Furthermore, the areolae of the single row along the mantle are elongated and are more or less widely open, which is a characteristic discernible in girdle view under light microscopy. The species that A.caravelense resembles most is A. eutrophilum (Lange-Bert.) Lange-Bert.; nevertheless it can be distinguished from the latter by the different raphe valve outline, its higher valve length/width ratio and autecology. A. caravelense is common and abundant in soft waters with low to moderate nutrient content in the North of Portugal.
URI: http://hdl.handle.net/10174/3727
ISSN: 1864-1318
Type: article
Appears in Collections:BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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