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Université de Fribourg

Molecular phylogenetics of the Brazilian giant bromeliads (Alcantarea, Bromeliaceae): implications for morphological evolution and biogeography

Versieux, Leonardo M. ; Barbará, Thelma ; Wanderley, Maria das Graças Lapa ; Calvente, Alice ; Fay, Michael F. ; Lexer, Christian

In: Molecular Phylogenetics and Evolution, 2012, p. -

The genus Alcantarea comprises near 30 species endemic to rocky outcrops from eastern Brazil. Most species are ornamental and several are threatened due to habitat loss and over collection. In this paper we examine the phylogenetics of Alcantarea and its relationship with the Brazilian members of Vriesea, a genus of which Alcantarea has been treated as a subgenus. We discuss the morphological...

Université de Fribourg

Phylogeography and genetic differentiation along the distributional range of the orchid Epidendrum fulgens: a Neotropical coastal species not restricted to glacial refugia

Pinheiro, Fábio ; Barros, Fábio De ; Palma-Silva, Clarisse ; Fay, Michael F. ; Lexer, Christian ; Cozzolino, Salvatore

In: Journal of Biogeography, 2011, vol. 38, no. 10, p. 1923–1935

Aim Phylogeographical studies in the Brazilian Atlantic Forest (BAF) have mostly included species associated with forest habitats, whereas taxa associated with grassland and sand-dune plant communities have so far been largely overlooked. This study examines the phylogeography of the orchid Epidendrum fulgens, which occurs on coastal sand dunes and granitic outcrops, in order to identify major...

Université de Fribourg

Sympatric bromeliad species (Pitcairnia spp.) facilitate tests of mechanisms involved in species cohesion and reproductive isolation in Neotropical inselbergs

Palma-Silva, Clarisse ; Wendt, T. ; Pinheiro, Fábio ; Barbará, Thelma ; Fay, Michael F. ; Cozzolino, Salvatore ; Lexer, Christian

In: Molecular Ecology, 2011, vol. 20, no. 15, p. 3185–3201

The roles of intra- and interspecific gene flow in speciation and species evolution are topics of great current interest in molecular ecology and evolutionary biology. Recent modelling studies call for new empirical data to test hypotheses arising from the recent shift from a ‘whole-genome reproductive isolation’ view to a ‘genic’ view of species and speciation. Particularly scarce (and...

Université de Fribourg

Genomic admixture analysis in european Populus spp. reveals unexpected patterns of reproductive isolation and mating

Lexer, Christian ; Joseph, Jeffrey A. ; Loo, Marcela van ; Barbará, Thelma ; Heinze, Berthold ; Bartha, Denes ; Castiglione, Stefano ; Fay, Michael F. ; Buerkle, C. Alex

In: Genetics, 2010, vol. 186, p. 699–712

Admixture between genetically divergent populations facilitates genomic studies of the mechanisms involved in adaptation, reproductive isolation and speciation, including mapping of the loci involved in these phenomena. Little is known about how pre- and postzygotic barriers will affect the prospects of 'admixture mapping' in wild species. We have studied 93 mapped genetic markers...

Université de Fribourg

Genetic diversity in Cypripedium calceolus (Orchidaceae) with a focus on north-western Europe, as revealed by plastid DNA length polymorphisms

Fay, Michael F. ; Bone, Ruth ; Cook, Peter ; Kahandawala, Imalka ; Greensmith, Jennifer ; Harris, Stacey ; Pedersen, Henrik Æ. ; Ingrouille, Martin J. ; Lexer, Christian

In: Annals of Botany, 2009, vol. 104, no. 3, p. 517-525

Background and Aims: Cypripedium calceolus, although widespread in Eurasia, is rare in many countries in which it occurs. Population genetics studies with nuclear DNA markers on this species have been hampered by its large nuclear genome size. Plastid DNA markers are used here to gain an understanding of variation within and between populations and of biogeographical patterns. Methods:...

Université de Fribourg

Genetic relationships and variation in reproductive strategies in four closely related bromeliads adapted to neotropical ‘inselbergs’: Alcantarea glaziouana, A. regina, A. geniculata and A. imperialis (Bromeliaceae)

Barbará, Thelma ; Martinelli, Gustavo ; Palma-Silva, Clarisse ; Fay, Michael F. ; Mayo, Simon ; Lexer, Christian

In: Annals of Botany, 2009, vol. 103, no. 1, p. 65-77

Background and Aims: Bromeliads (Bromeliaceae) adapted to rock outcrops or ‘inselbergs’ in neotropical rain forests have been identified as suitable plant models for studying population divergence and speciation during continental plant radiations. Little is known about genetic relationships and variation in reproductive strategies within and among inselberg-adapted species, yet knowledge...