References of "Violle, Cyrille"
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See detailSpatio-temporal floral resource shifts in Belgium
Jacquemin, Floriane ULiege; Violle, Cyrille; Coppee, Thomas ULiege et al

Poster (2018, September 20)

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See detailThe role of bees in interaction networks with plants as a conservation argument
Jacquemin, Floriane ULiege; Violle, Cyrille; Munoz, François et al

Conference (2018, September 18)

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See detailMapping the dependency of crops on pollinators in Belgium
Jacquemin, Floriane ULiege; Violle, Cyrille; Rasmont, Pierre et al

in One Ecosystem (2017)

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See detailNaturalist historical databases help us to better understand plant-bee interactions and their dynamics across space and time
Jacquemin, Floriane ULiege; Folschweiller, Morgane; Drossart, Maxime et al

Poster (2016, December 02)

This work highlights the interest of compiling opportunistic naturalist databases and to systematically inform the host plants on which species are observed during sampling time to assess the impact of ... [more ▼]

This work highlights the interest of compiling opportunistic naturalist databases and to systematically inform the host plants on which species are observed during sampling time to assess the impact of land-use changes on plant-bee interactions, thanks to unique historical time series. Such initiative is a step forward in the perspective of pollination service mapping and tracking of changes at a biogeographical scale. [less ▲]

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See detailPlant diversity loss forces shift in ecological strategies for wild bees : Insights from historical time series at a country-wide scale
Jacquemin, Floriane ULiege; Violle, Cyrille; Munoz, François et al

Conference (2016, October 27)

Network analysis approach was used to investigate species composition, their interactions and dynamics over time to relate network patterns to ecological processes. Historical database used contains ... [more ▼]

Network analysis approach was used to investigate species composition, their interactions and dynamics over time to relate network patterns to ecological processes. Historical database used contains information about plant species visited at sampling time for ~ 50,000 identified specimens since 1900. Several indices were calculated to characterize the network topology (connectance, mean number of links, modularity, nestedness, H2fun, d2fun,…) and the ecological roles of bees (participation (c) and connectivity (z) coefficients). As a result, we identified a loss of bee species specialization through a loss of very specialist bee species and a shift to more generalist species. This work highlights the interest of compiling opportunistic naturalist databases and systematically informing the host plants on which species are observed. [less ▲]

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See detailSAPOLL : A cross-border action plan for wild pollinators
Drossart, Maxime; Folschweiller, Morgane; Jacquemin, Floriane ULiege et al

Poster (2016, February)

Wild pollinators in the France-Wallonia-Vlaanderen cross-border zone represent a valuable but highly endangered resource. In order to protect these pollinators, it is essential to set up a cross-border ... [more ▼]

Wild pollinators in the France-Wallonia-Vlaanderen cross-border zone represent a valuable but highly endangered resource. In order to protect these pollinators, it is essential to set up a cross-border organization that enables coordinated actions and synergies between regions. Indeed, isolated actions on both sides of the border are unlikely to lead to the sustainable management of this indispensable resource. The challenge is huge because wild pollinators, wild bees, syrphs and butterflies, are essential to maintaining agriculture and ecosystems in our regions. In order to meet this challenge, the SAPOLL project initiates the implementation of a cross-border action plan for wild pollinators with the actors from Wallonia, Flanders and northern France. This plan is the initiator of actions in favor of pollinators, bringing the necessary scientific, didactic and applied context to citizens, decision-makers, entrepreneurs or enrionmental managers. It is also adapted to the regional context of each area. The action plan, which is co-built with the partners in the cross-border territory. The SAPOLL project also organizes activities that aim to homogenize and share scientific knowledge, awareness-raising experience and naturalistic competences. [less ▲]

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See detailCommunity assembly along a soil depth gradient: contrasting patterns of plant trait convergence and divergence in a Mediterranean rangeland
Bernard-Verdier, Maud; Navas, Marie-Laure; Vellend, Mark et al

in Journal of Ecology (2012), (100), 1422-1433

1. Understanding how environmental factors drive plant community assembly remains a major challenge in community ecology. The strength of different assembly processes along environmental gradients, such ... [more ▼]

1. Understanding how environmental factors drive plant community assembly remains a major challenge in community ecology. The strength of different assembly processes along environmental gradients, such as environmental filtering and functional niche differentiation, can be quantified by analysing trait distributions in communities. While environmental filtering affects species occurrence among communities, functional divergence or convergence is strongly related to species abundances within communities, which few studies have taken into account. We examine the trait-mediated effect of these two processes along a stress-resource gradient. 2. We measured species abundances and the distributions of eight traits related to vegetative and regenerative phases in plant communities along a gradient of soil depth and resource availability in Mediterranean rangelands. We quantified environmental filtering, defined as a local restriction of trait range, and trait divergence, based on abundance-weighted trait variance, using a two-step approach with specifically designed null models. 3. Communities presented a clear functional response to the soil gradient, as evidenced by strong trends in community-weighted trait means. We detected environmental filtering of different traits at both ends of the gradient, suggesting that, contrary to widespread expectations, trait filtering may not necessarily be the result of abiotic filtering under harsh conditions but could likely also result from biotic interactions in productive habitats. 4. We found marked shifts in trait abundance distributions within communities along the gradient. Vegetative traits (e.g. leaf dry matter content) diverged on shallow soils, reflecting the coexistence of distinct water- and nutrient-use strategies in these constrained habitats and converged with increasing soil resource availability. By contrast, regenerative traits (e.g. seed mass) tended to diverge towards deeper soils, while plant reproductive heights diverged all along the gradient. 5. Synthesis: Our study highlights how the combination of abundance data with traits capturing different functional niches is critical to the detection of complex functional responses of plant communities to environmental gradients. We demonstrate that patterns of trait divergence and filtering are strongly contingent on both trait and environment such that there can be no expectation of a simple trend of increasing or decreasing functional divergence along a gradient of resource availability. [less ▲]

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See detailDifferential impacts of plant interactions on herbaceous species recruitment: disentangling factors controlling emergence, survival and growth of seedlings
Fayolle, Adeline ULiege; Violle, Cyrille; Navas, Marie-Laure

in Oecologia (2009)

Recruitment is a crucial event in the plant life cycle that is very sensitive to interaction with established vegetation. Based on a large comparative experiment, we tested the hypothesis that the ... [more ▼]

Recruitment is a crucial event in the plant life cycle that is very sensitive to interaction with established vegetation. Based on a large comparative experiment, we tested the hypothesis that the components of recruitment –emergence time and rate, seedling survival and biomass – differ in response to plant-plant interactions during recruitment. The consequences for the population are predicted with a simple demographic model assessing the response of seed production. In a common garden experiment, we recorded the recruitment of four target species in an individual-based survey protocol. A total of 7,680 seeds were sown within 20 neigbourhoods, consisting of 19 mono-specific herbaceous stands and a control treatment without vegetation. We measured transmitted light, temperature and moisture at soil surface to characterise the environmental conditions within neighbourhoods. The mean height of neighbours controlled temperature buffering and light interception and thus depicted the interaction gradient. Emergence rate and time increased with neighbour height in two of the four target species, while seedling survival and biomass significantly decreased with neighbour height in three and all four target species, respectively. We recorded a shift in seedling neighbour interactions under the tallest neighbours that largely favoured emergence but strongly depressed seedling survival and biomass. The components of recruitment were predicted to differ in their impact on later adult performance. Biomass strongly contributed to predicted seed production in three target species, and emergence had an equal or greater impact on a fourth species. These results confirm the fundamental role of plant-plant interactions in the recruitment of herbaceous species through a complex combination of habitat amelioration, which facilitates emergence and light competition, which in turn limits seedling survival and biomass. [less ▲]

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