12 Works

Mechanisms of dietary resource partitioning in large-herbivore assemblages: a plant-trait-based approach

Arjun Potter, Matthew Hutchinson, Johan Pansu, Bart Wursten, Ryan Long, Jonathan Levine & Robert Pringle
Sympatric large mammalian herbivore species differ in diet composition, both by eating different parts of the same plant and by eating different plant species. Various theories proposed to explain these differences are not mutually exclusive, but are difficult to reconcile and confront with data. Moreover, whereas several of these ideas were originally developed with reference to within-plant partitioning (i.e., consumption of different tissues), they may analogously apply to partitioning of plant species; this possibility has...

What drives diversification in a pantropical plant lineage with extraordinary capacity for long-distance dispersal and colonisation?

Isabel Larridon, Javier Galán Díaz, Kenneth Bauters & Marcial Escudero
Aim: Colonisation of new areas may entail shifts in diversification rates linked to biogeographic movement (dispersification), which may involve niche evolution if species were not pre-adapted to the new environments. Scleria (Cyperaceae) includes c. 250 species and has a pantropical distribution suggesting an extraordinary capacity for long-distance dispersal and colonisation. We investigate patterns of diversification in Scleria, and whether they are coupled with colonisation events, climate niche shifts or both. Location: Tropics and subtropics. Taxon:...

Pre-adaptation to climate change through topography-driven evolution of traits and their plasticity

Hanne De Kort, Bart Panis, Steven Janssens, Kenny Helsen & Olivier Honnay
1. Climate change will increase the level of drought stress experienced by plant communities, but the spatial distribution of projected changes in dryness remains highly uncertain. Species can, to some extent, deal with climate uncertainty through natural variation in adaptive responses to environmental heterogeneity and predictability. Biodiversity conservation could thus target populations pre-adapted to climatic heterogeneity to anticipate climate uncertainty. Disentangling evolution of trait means vs. trait plasticity, however, requires a sampling design with genetic...

Highlighting convergent evolution in morphological traits in response to climatic gradient in African tropical tree species: the case of genus Guibourtia Benn

Felicien Tosso, Jean-Louis Doucet, Kasso Daïnou, Adeline Fayolle, Alain Hambuckers, Charles Doumenge, Honoré Agbazahou, Piet Stoffelen & Olivier Hardy
Adaptive evolution is a major driver of organism diversification but the links between phenotypic traits and environmental niche remains little documented in tropical trees. Moreover, trait-niche relationships are complex because a correlation between the traits and environmental niches displayed by a sample of species may result from (1) convergent evolution if different environmental conditions have selected different sets of traits, and/or (2) phylogenetic inertia if niche and morphological differences between species are simply function of...

Data from: Ex situ cultivation entails high risk of seed dormancy loss on short-lived wild plant species

Andreas Ensslin, Ann Van De Vyver, Thierry Vanderborght & Sandrine Godefroid
1. Changes in life-history traits such as seed dormancy during cultivation of wild plant species in ex situ facilities could jeopardise conservation actions such as revegetation and plant reintroductions, but the magnitude of these risks and their spread across different plant taxa is unknown. 2. In this study, we explored whether plants cultivated in the Botanic Garden Meise differ in seed germination characteristics from plants from natural populations. Using a Bayesian approach of a phylogenetically...

Data from: Ecological niche and phylogeny explain distribution of seed mass in the Central European flora

Filip Vandelook, Steven B. Janssens & Diethart Matthies
Seed size is a crucial life-history trait determining the amount of reserves that are available to establishing seedlings. The most frequently observed patterns in seed size distribution are a higher frequency of large-seeded species in shaded habitats and a positive correlation of seed size with plant size. We analysed to what extent realised niche dimensions, as expressed by Ellenberg indicator values and plant functional traits such as plant height and life form, explained seed mass...

Data from: Lineages of Silene nutans developed rapid, strong, asymmetric postzygotic reproductive isolation in allopatry

Helene Martin, Pascal Touzet, Mathilde Dufay, Cécile Godé, Eric Schmitt, Emna Lahiani, Lynda F. Delph & Fabienne Van Rossum
Reproductive isolation can rise either as a consequence of genomic divergence in allopatry or as a byproduct of divergent selection in parapatry. To determine whether reproductive isolation in gynodioecious Silene nutans results from allopatric divergence or from ecological adaptation following secondary contact, we investigated the pattern of postzygotic reproductive isolation and hybridization in natural populations using two phylogeographic lineages, western (W1) and eastern (E1). Experimental crosses between the lineages identified strong, asymmetric postzygotic isolation between...

Global biogeography and diversification of a group of brown seaweeds (Phaeophyceae) driven by clade-specific evolutionary processes

Christophe Vieira, Frederique Steen, Sofie D'hondt, Quinten Bafort, Cindy Fernandez-García, Brian Wysor, Lennert Tyberghein, Ana Tronholm, Lydiane Mattio, Claude Payri, Gary Saunders, Frederik Leliaert, Heroen Verbruggen & Olivier De Clerck
Aim: Historical processes that shaped current diversity patterns of seaweeds remain poorly understood. Using Dictyotales, a globally distributed order of brown seaweeds as a model, we test if historical biogeographical and diversification patterns are comparable across clades. Dictyotales contain some 22 genera, three of which, Dictyota, Lobophora and Padina, are exceptionally diverse. Specifically we test if the evolutionary processes in these clades that shaped their latitudinal diversity patterns are in line with the tropical conservatism,...

Data from: Evolution of woody life form on tropical mountains in the tribe Spermacoceae (Rubiaceae)

Suman Neupane, Paul O. Lewis, Steven Dessein, Hunter Lee Shanks, Sushil Paudyal, Frederic Lens & Hunter Shanks
Spermacoceae are mainly an herbaceous group in the Rubiaceae. However, a few lineages are woody, and are found in a diverse range of habitat types. Three of the largest woody lineages (Arcytophyllum, Hedyotis, and Kadua) are characterized by their distribution in the moist tropical mountains, and have disjunct distribution patterns with respect to their closest relatives. In this study, we explore the cases of derived woodiness in these three lineages and their diversification dynamics in...

Data from: Disentangling the effects of mating systems and mutation rates on cytoplamic diversity in gynodioecious Silene nutans and dioecious Silene otites

Pascal Touzet, Emna Lahiani, Mathilde Dufay, Vincent Castric, Solenn Le Cadre, Deborah Charlesworth & Fabienne Van Rossum
Many flowering plant species exhibit a variety of distinct sexual morphs, the two most common cases being the co- occurrence of females and males (dioecy) or the co-occurrence of hermaphrodites and females (gynodioecy). In this study we compared DNA sequence variability of the three genomes (nuclear, mitochondrial and chloroplastic) of a gynodioecious species, Silene nutans, with that of a closely related dioecious species, Silene otites. In the light of theoretical models, we expect cytoplasmic diversity...

Data from: Phylogeographic pattern of range expansion provides evidence for cryptic species lineages in Silene nutans in Western Europe

Hélène Martin, Pascal Touzet, Fabienne Van Rossum, Damien Delalande & Jean-François Arnaud
As a result of recent or past evolutionary processes, a single species might consist of distinct Evolutionary Significant Units (ESUs), even corresponding to cryptic species. Determining the underlying mechanisms of range shifts and the processes at work in the build-up of divergent ESUs requires elucidating the factors that contribute to population genetic divergence across a species’ range. We investigated the large-scale patterns of genetic structure in the perennial herbaceous plant species Silene nutans (Caryophyllaceae) in...

Data from: Congruent phylogeographic patterns of eight tree species in Atlantic Central Africa provide insights on the past dynamics of forest cover

Gilles Dauby, Jérôme Duminil, Myriam Heuertz, K. Guillaume Koffi, Tariq Stévart & Olivier J. Hardy
Cycles of Quaternary climate change are assumed to be major drivers of African rainforest dynamics and evolution. However, most hypotheses on past vegetation dynamics relied on palaeobotanical records, an approach lacking spatial resolution, and on current patterns of species diversity and endemism, an approach confounding history and environmental determinism. In this context, a comparative phylogeographic study of rainforest species represents a complementary approach because Pleistocene climate fluctuations may have left interpretable signatures in the patterns...

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  • Botanic Garden Meise
  • French National Centre for Scientific Research
  • Université Libre de Bruxelles
  • Estación Biológica de Doñana
  • University of Liège
  • Ghent University
  • Princeton University
  • Royal Botanic Gardens
  • Roger Williams University
  • University of Melbourne