8 Works

Top-down cascading effects of seed-feeding beetles and their parasitoids on plants and leaf herbivores

Maximilien Cuny, Diana La Forgia, Gaylord Desurmont, Carlos Bustos-Segura, Gaetan Glauser & Betty Benrey
When feeding on a plant, herbivorous insects alter the quality of the plant as a food source. This affects other organisms interacting with the same plant. These so-called ‘plant-mediated interactions’ can be altered by parasitoids that attack the herbivores. So far, this research area has mainly focused on interactions at the leaf level, and very little is known about plant-mediated interactions via seeds. It is still poorly understood if seeds that survive insect damage have...

Generalised host-plant feeding can hide sterol specialised foraging behaviours in bee-plant interactions

Maryse Vanderplanck, Pierre-Laurent Zerck, Georges Lognay & Denis Michez
Host-plant selection is a key factor driving the ecology and evolution of insects. While the majority of phytophagous insects are highly host specific, generalist behaviour is quite widespread among bees and presumably involves physiological adaptations that remain largely unexplored. However floral visitation patterns suggest that generalist bees do not forage randomly on all available resources. While resource availability and accessibility as well as nectar composition have been widely explored, pollen chemistry could also have an...

Data from: Relationships between population density, fine-scale genetic structure, mating system and pollen dispersal in a timber tree from African rainforests.

Jérôme Duminil, Kasso Daïnou, David Kombi Kaviriri, Pauline Gillet, Judy Loo, Jean-Louis Doucet & Olivier J. Hardy
Due to the reduction of population density and/or the environmental changes it induces, selective logging could affect the demography, reproductive biology and evolutionary potential of forest trees. This is particularly relevant in tropical forests where natural population densities can be low and isolated trees may be subject to outcross pollen limitation and/or produce low quality selfed seeds that exhibit inbreeding depression. Comparing reproductive biology processes and genetic diversity of populations at different densities can provide...

Data from: Speciation slowing down in widespread and long-living tree taxa: insights from the tropical timber tree genus Milicia (Moraceae)

Kasso Dainou, Grégory Mahy, Jérôme Duminil, Christopher W. Dick, Jean-Louis Doucet, Armel S. L. Donkpégan, Michaël Pluijgers, Brice Sinsin, Philippe Lejeune & Olivier J. Hardy
The long generation time and large effective size of widespread forest tree species can result in slow evolutionary rate and incomplete lineage sorting, complicating species delimitation. We addressed this issue with the African timber tree genus Milicia that comprises two morphologically similar and often confounded species: M. excelsa, widespread from West to East Africa, and M. regia, endemic to West Africa. We combined information from nuclear microsatellites (nSSRs), nuclear and plastid DNA sequences, and morphological...

Data from: The influence of spatially structured soil properties on tree community assemblages at a landscape scale in the tropical forests of southern Cameroon

Jason Vleminckx, Jean-Louis Doucet, Julie Morin-Rivat, Achille Biwolé, David Bauman, Olivier J. Hardy, Adeline Fayolle, Jean-François Gillet, Kasso Daïnou, Anaïs Gorel & Thomas Drouet
Species distribution within plant communities results from both the influence of deterministic processes, related to environmental conditions, and neutral processes related to dispersal limitation and stochastic events, the relative importance of each factor depending on the observation scale. Assessing the relative contribution of environment necessitates controlling for spatial dependences among data points. Recent methods, combining multiple regression and Moran's eigenvectors maps (MEM), have been proved successful in disentangling the influence of pure spatial processes related...

Data from: A shift from phenol to silica-based leaf defenses during long-term soil and ecosystem development

Félix De Tombeur, Etienne Laliberté, Hans Lambers, Michel-Pierre Faucon, Graham Zemunik, Benjamin Turner, Jean-Thomas Cornélis & Grégory Mahy
The resource availability hypothesis predicts that plants adapted to infertile soils have high levels of anti-herbivore leaf defenses. This hypothesis has been mostly explored for secondary metabolites such as phenolics, while it remains underexplored for silica-based defenses. We determined leaf concentrations of total phenols and silicon (Si) in plants growing along the 2-million-year Jurien Bay chronosequence, exhibiting an extreme gradient of soil fertility. We found that nitrogen (N) limitation on young soils led to a...

Data from: History of the fragmentation of the African rain forest in the Dahomey Gap: insight from the demographic history of Terminalia superba

Boris Demenou, Jean-Louis Doucet & Olivier J. Hardy
Paleo-environmental reconstructions show that the distribution of tropical African rain forests was affected by Quaternary climate changes. They suggest that the Dahomey Gap (DG) - the savanna corridor that currently separates Upper Guinean (UG, West Africa) and Lower Guinean (LG, western Central Africa) rain forest blocks – was forested during the African Humid Holocene period (from at least 9 ka till 4.5 ka), and possibly during other interglacial periods, while an open vegetation developed in...

Data from: DNA taxonomy in the timber genus Milicia: evidence of unidirectional introgression in the West African contact zone

Kasso Daïnou, Jean-François Flot, Bernd Degen, Céline Blanc-Jolivet, Jean-Louis Doucet, Ludivine Lassois & Olivier J. Hardy
DNA-based techniques are helpful in characterising hybridisation patterns in plant species. To be efficient in disentangling species boundaries and interspecific gene flow, it is recommended to combine various methodologies and types of markers. Here, we used different analytical tools (algorithms implemented in Structure, Tess, NewHybrids and HIest, and the haploweb approach) and three nuclear genetic markers (7 nuclear simple sequence repeat loci (SSRs), 62 single-nucleotide polymorphism loci (SNPs) and a single-copy gene region, At103) to...

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