Alexandre Raimbault présente ses travaux de thèse à la conférence BES à Edimbourgh

Raimbault, A. (a); Brin, A. (a); Manzi, S. (b); Savoie, J.M. (a); Fogliani, O. (c); Roy, M. (b): Influence of the landscape on mycorrhizal communities in ancient forests in Occitania (France)

(a) Ecole d’ingénieur de Purpan INPT/ ENSAT/EIPURPAN, UMR 1201 DYNAFOR 75 Voie du TOEC BP 57611 31076 TOULOUSE Cedex 3 France

(b) Laboratoire Evolution Diversité Biologique UMR 5174 Université Toulouse 3 Paul Sabatier Bâtiment 4 R 1 118 route de Narbonne 31062 Toulouse cedex 9 France

(c) Université du Québec en Abiti-Témiscamingue, 445 Bd de l'Université, Rouyn-Noranda, QC J9X 5E4, Canada

Abstract: Habitat fragmentation is an important consequence of land use change and is considered a significant threat to biodiversity. Fahrig proposes the hypothesis that the quantity of habitat in the landscape would be more important than the effects of the number and isolation of habitat fragments. Despite the essential roles played by fungi in the maintenance and functioning of ecosystems, very few studies focus on the consequences of the fragmentation of their habitats. The objective of this study is to observe how the proportion and number of patches of ancient forests influence fungal communities in the landscape of southwestern France. We characterized the fungal communities of 41 plots with eDNA. The results show that the number of patches of ancient forest negatively influences the alpha diversity of pathotrophs in contrast to symbiotrophs and saprotroph. Soil variables also have a significant effect on alpha diversity regardless of guild