Réponse à échelle fine de Primula vulgaris Huds. à la structure du paysage : la connectivité physique des réseaux de haies favorise-t-elle les flux de gènes?

International audienceVariation in pollen flow, mating performances, and seed dispersal were examined using direct and indirect approaches in contrasted hedgerow networks (i.e., dense vs. sparse) of the distylous Primula vulgaris. Seed dispersal reached negligible distances, and no difference was observed between the two hedgerow networks. On the contrary, pollen flow through Bombylius sp. activity was impeded in the dense hedgerow network. Furthermore, P. vulgaris was found to be partially self-compatible in our study site. The lower pollen flow in the dense hedgerow network, and especially in small populations, is likely to have unusually favoured self-compatibility and hence selfing in P. vulgaris short-style morph. In addition, the inbreeding depression values recorded were higher in the dense hedgerow network. Our results suggested that a dense hedgerow network does not necessarily ensure connectivity in Primula vulgaris in terms of gene flow. This study provides evidence for considering landscape structure in the microevolutionary processes

Sources and sinks of ozone in savanna and forest areas during EXPRESSO: Airborne turbulent flux measurements

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Fine-scale response to landscape structure in Primula vulgaris Huds. : does hedgerow network connectedness ensure connectivity through gene flow?

Variation in pollen flow, mating performances, and seed dispersal were examined using direct and indirect approaches in contrasted hedgerow networks (i.e., dense vs. sparse) of the distylous Primula vulgaris. Seed dispersal reached negligible distances, and no difference was observed between the two hedgerow networks. On the contrary, pollen flow through Bombylius sp. activity was impeded in the dense hedgerow network. Furthermore, P. vulgaris was found to be partially self-compatible in our study site. The lower pollen flow in the dense hedgerow network, and especially in small populations, is likely to have unusually favoured self-compatibility and hence selfing in P. vulgaris short-style morph. In addition, the inbreeding depression values recorded were higher in the dense hedgerow network. Our results suggested that a dense hedgerow network does not necessarily ensure connectivity in Primula vulgaris in terms of gene flow. This study provides evidence for considering landscape structure in the microevolutionary processes

Genetic signs of connectivity in Primula vulgaris (Primulaceae) in a hedgerow network landscape

The effects of landscape configuration on the genetic connectivity of the heterostylous species Primula vulgaris Huds. (Primulaceae) were studied using AFLP markers. Isolation by distance pattern was shown by spatial autocorrelation analysis; moreover, hedgerow network distances were found to contribute less than Euclidian distances to spatial genetic structure. Pollen flow is probably the main factor shaping the spatial genetic structure rather than seed dispersal, which is limited in this myrmecochorous species. Detailed analysis on the genetic similarity between neighborhoods and differentiation rates showed that density of hedgerow networks impede gene flow. We therefore concluded that a high degree of habitat contiguity does not necessarily promote genetic connectivity. To cite this article: P Campagne et al., C R. Biologies 332 (2009)

Carpobrotus eradication on a Mediterranean island: a compromise between recolonization of Carpobrotus and native species, and soil degradation issues

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Les Griffes de sorcière, Carpobrotus, une espèce invasive du littoral : méthodes d’éradication, application à l’île de Bagaud et conséquences sur la flore de Bagaud

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Restauration écologique de la Réserve intégrale de l’île de Bagaud (Var, 83) : résilience de la végétation autochtone après éradication des Carpobrotus spp. invasifs.

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