Study ecosystems

Microbiome networks

rice

Rice fungal pathogens
Objective and System hypothesis
To reconstruct foliar microbial networks of positive and negative associations between OTUs in rice. Foliar microbes act as a barrier effect to foliar pathogens and modulate foliar physiology and their resilience is not understood. We test the hypothesis that intensive farming modifies foliar networks and ablates the barrier effect.

Hourtin_3sp_picture

Foliar microbiota of trees
Objective and System hypothesis
To reconstruct foliar microbial networks in several tree species differing in their tolerance to drought. Foliar microbes modulate foliar physiology and protect trees against biotic and abiotic stresses (pathogens, drought). We will test the hypothesis that drought-tolerant species harbor more diverse microbial communities and more stable microbial networks, and that drought-induced alteration of microbial networks ablates the barrier effect against pathogens.

Drosophila

Invasive fruit flies and bacteria
Objective and System hypothesis
To learn tripartite trophic networks between host plants, fruit flies (Tephritid sp.) and gut bacteria in La Reunion island. Fruit fly gut bacteria help synthesize essential amino acids and minerals and prevent the colonization of the gut by pathogenic bacteria. We will test whether the gut microbiota of fruit flies determines host range and their invasibility.
Macrobiome networks

biomphalaria

Freshwater invaded system
Objective and System hypothesis
To reconstruct mollusc species competition networks in lentic freshwaters of Grande-terre and Marie-Galante islands. Species invasion has led to marked changes in network structure, with local reductions and extinction of Biomphalaria glabrata that hosts the parasite Schistosoma mansoni, which we hypothesise has modified rates of schistosome transmission to humans and rats.

bombus

Plant-pollinator interactions
Objective and System hypothesis
To learn bipartite plant-pollinator visitation networks. Land use and climate change are modifying plant-pollinator network structure and function. Plant and pollinator species diversity increases from North to South in France. We will test whether this gradient is explained by changes in network connectance or modularity.

carabid

Arable agricultural ecosystem
Objective and System hypothesis
To reconstruct bipartite invertebrate-plant trophic interaction networks, centred on the carabid beetles in agriculture. Our hypothesis is that change in farmland management (herbicide use), acts on weed plants and modifies network structure and function.


  Teams