The role plays by freshwater insects in terrestrial ecosystems: a review of our current works and future challenges



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19/03/21 - Séminaire (en ligne) de Christophe PISCART et Benjamin BERGEROT

Le vendredi 19 mars 2021 à 13h00, séminaire en ligne

The role plays by freshwater insects in terrestrial ecosystems: a review of our current works and future challenges

The amount of available energy is mainly supported by autochthonous primary production in most ecosystems. However, recent studies brought out the crucial role played by reciprocal subsidies (allochtonous inputs) between ecosystems and their interface (ecotone). In freshwater ecosystems, the ratio between autochthonous and allochtonous productions is hence depending on the landscape structure (River Continuum Concept). Conversely, the highly productive and diversified freshwater ecosystems provide a large amount of organisms to adjacent terrestrial ecosystems representing until several hundreds of kg biomass per hectare per year. Exchanges between terrestrial and aquatic ecosystems are mainly controlled by landscape connectivity (e.g. presence of corridors, barriers, etc…) but also by dispersal capabilities of species. However, the research topic is still poorly investigated and both dispersal mechanisms of aquatic insects in terrestrial ecosystems and the effects of landscape characteristics remain largely unknown. That is why, we started few years ago to develop studies at the interface between freshwater and terrestrial boundary to understand the role play by aquatic insects (with aquatic larvae and terrestrial adults) in the biodiversity patterns and associated fluxes observed at the Land-Stream interface and their consequences on the ecosystem functionning. This talk aim to present i) a summary of our research questions, ii) the preliminary results already obtained and iii) our future challenges.