References of "Vanderpoorten, Alain"
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See detailEvolution of multiple paralogous adenosine kinase genes in the moss genus Hygroamblystegium: phylogenetic implications
Vanderpoorten, Alain ULg; Shaw, A. J.; Cox, C. J.

in Molecular Phylogenetics and Evolution (2004), 31(2), 505-516

Maximum likelihood analyses of DNA sequences from two chloroplast regions, trnL-trnF and atpB-rbcL, and the internal transcribed spacers of ISS-5.8S-26S rRNA gene array, were performed to resolve species ... [more ▼]

Maximum likelihood analyses of DNA sequences from two chloroplast regions, trnL-trnF and atpB-rbcL, and the internal transcribed spacers of ISS-5.8S-26S rRNA gene array, were performed to resolve species relationships within the moss genus Hygroamblystegium. Constraining morphospecies to monophyly resulted in significantly less likely trees for H. tenax, but not for the other species. The lack of support for most clades and the partial incongruence among topologies necessitated the use of another independent, more variable region, namely the adenosine kinase gene (adk). Sequences for adk were polymorphic but were present as multiple copies within individuals. making parology a problem for phylogenetic analyses. Adk evolution was reconstructed using a reconciled gene tree approach in which duplications and losses were minimized in the context of ail estimate of the species tree derived from the analysis of the cp and nrDNA sequence data. Additional resolution of the species tree was then obtained by searching for reconstructions that further reduced adk duplications and losses. All the traditionally recognized morphospecies appeared to be polyphyletic in the resulting tree. Together with previous data from different molecular markers, the results Support the interpretation that Hygroamblystegium represents a recent radiation in which molecular and morphological evolution have been uncoupled. (C) 2003 Elsevier Inc. All rights reserved. [less ▲]

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See detailEvolutionary mode, tempo, and phylogenetic association of continuous morphological traits in the aquatic moss genus Amblystegium
Vanderpoorten, Alain ULg; Jacquemart, A. L.

in Journal of Evolutionary Biology (2004), 17(2), 279-287

Evolutionary significance of morphological characters that have traditionally been used for species delineation in the aquatic moss genus Amblystegium was tested by partitioning the environmentally and ... [more ▼]

Evolutionary significance of morphological characters that have traditionally been used for species delineation in the aquatic moss genus Amblystegium was tested by partitioning the environmentally and genetically induced morphological variation and focusing on morphological evolution using comparative methods. Cultivation experiments under controlled condition showed that most of the morphological variation in nature resulted from plasticity. Information regarding genetically fixed morphological variation and genetic similarity derived from polymorphic inter-simple sequence repeat markers was combined into an explicit model of morphological evolution. Maximum likelihood estimates of the model parameters indicated that evolution of most characters tended to accelerate in the most recent taxa and was often independent from the phylogeny. Constraining the different characters to be independent from each other most often produced a less likely result than when the characters were free to evolve in a correlated fashion. Thus, the morphological characters that have traditionally been used to circumscribe different Amblystegium species lack the independence, diagnostic value for specific lineages, and stability that would be required for distinguishing different species. [less ▲]

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See detailA contribution to the moss flora of southern South Africa
Vanderpoorten, Alain ULg; Barker, N. P.

in Journal of Bryology (2004), 26(Part 3), 230-232

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See detailThe Bryophyte Layer In A Calcareous Grassland After A Decade Of Contrasting Mowing Regimes
Vanderpoorten, Alain ULg; Delescaille, Lm.; Jacquemart, Al.

in Biological Conservation (2004), 117(1),

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See detailPatterns of molecular and morphological variation in Leucobryum albidum, L. Glaucum, and L-juniperoideum (Bryopsida)
Vanderpoorten, Alain ULg; Boles, S.; Shaw, A. J.

in Systematic Botany (2003), 28(4, OCT-DEC), 651-656

Restriction digest patterns from 18S-26S nuclear ribosomal DNA internal transcribed spacers (ITS) were employed to investigate delineation between the morphologically similar moss species Leucobryum ... [more ▼]

Restriction digest patterns from 18S-26S nuclear ribosomal DNA internal transcribed spacers (ITS) were employed to investigate delineation between the morphologically similar moss species Leucobryum glaucum, L. juniperoideum, and L. albidum. Discriminant analysis allowed assignment of specimens to haplotypes based on their morphological features and supported the recognition of L. glaucum and L. albidum. In contrast, L. albidum and L. juniperoideum both corresponded to the same haplotype. Many populations could be readily assigned to either L. glaucum or L. albidum by their morphological features. However, morphological variation between these two species was continuous and one of the ITS haplotypes could not be unambiguously characterized by its morphology. Genetically and morphologically identifiable specimens of L. albidum were sampled in Europe and North America, in contrast to the traditional interpretation of L. albidum as a North American endemic. Although L. albidum seems to have a more southern-Atlantic distribution pattern than L. glaucum, the two species occupy broadly overlapping geographic ranges and were sometimes found intermixed. [less ▲]

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See detailA taxonomic reassessment of the Vittiaceae (Hypnales, Bryopsida):evidence from phylogenetic analyses of combined chloroplast and nuclear sequence data
Vanderpoorten, Alain ULg; Goffinet, B.; Hedenäs, L. et al

in Plant Systematics & Evolution (2003), 241

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See detailPatterns Of Bryophyte Diversity And Rarity At A Regional Scale
Vanderpoorten, Alain ULg; Engels, Patrick ULg

in Biodiversity & Conservation (2003), 12(3),

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See detailTaxonomic assessment, distribution, and ecology of Tortula vahliana var. minor (Pottiaceae, Bryopsida)
Andriessen, L.; Nagels, C.; Arts, T. et al

in Journal of Bryology (2002), 24

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See detailPhylogeny and Morphological Evolution of the Amblystegiaceae (Bryopsida)
Vanderpoorten, Alain ULg; Hedenäs, L.; Cox, C. J. et al

in Molecular Phylogenetics & Evolution (2002), 23

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See detailA model for assessing water chemistry by using aquatic bryophyte assemblages in north-eastern France
Vanderpoorten, Alain ULg; Thiébaut, G.; Trémolières, M. et al

in Verhandlungen der Internationalen Vereinigung für Theoretische und Angewandte Limnologie = Proceedings of the International Association of Theoretical and Applied Limnology (2001), 27

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See detailUne révision critique de la distribution de Tortula inermis en Belgique
Vanderpoorten, Alain ULg; Stieperaere, H.; Sotiaux, André ULg

in Dumortiera (2001), 77

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See detailThe Syntrichia Ruralis Complex In Belgium
Vanderpoorten, Alain ULg

in Cryptogamie Bryologie (2001), 22(2),

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See detailAquatic bryophyte assemblages along a gradient of regulation in the river Rhine
Vanderpoorten, Alain ULg; Klein, J. P.

in Hydrobiologia (2000), 410

A study of the zonation of the aquatic bryophyte assemblages from the Anterior Rhine to the Middle Rhine is presented. The typology obtained differs from the hydrogeoinorphological classification because ... [more ▼]

A study of the zonation of the aquatic bryophyte assemblages from the Anterior Rhine to the Middle Rhine is presented. The typology obtained differs from the hydrogeoinorphological classification because the correction of the river has led to the homogenization of habitats. Since the straightening of the river in the course of the 19th century, the embankments have created more stable habitats on which mountain species formerly characteristic of the rapids of the High Rhine appeared. During the 20th century, regulation, the construction of hydroelectric powerstations even the canalization of the river in Alsace. have caused a great change in water level. On the Upper Rhine, the rcgularisation of the water level .'allowed the appearance and the spread of strict hydrophytes such as Octodiceras fontanum which is now common between Rastatt and Bonn. Conversely, species characteristic of variable water levels decreased or disappeared. The industrial development along the river has caused water quality to severely decrease downstream of the industrial areas, hence the decrease or the disappearance of their primary flora in favour of pollution-tolerant assemblages. The former side channels of the Upper Rhine in France that have been disconnected from the main river and fed by groundwater since canalization, possess a bryophyte flora very similar to that of good quality waters in the upstream part of the High Rhine or in the Alpine Rhine. This flora is the last regional relic of a flora that has disappeared from the main channel due to water pollution. These refugia should consequently be preserved from the flooding of alluvial forests, part of the flood management program. [less ▲]

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