New mechanistic insights into the reorganization of multi-trophic communities in novel ecosystems

Poster session
Partie de:
vendredi 20 déc. 11:30 AM (1 heure)
Dîner   12:30 PM à 01:30 PM (1 heure)
Salle ABCD
Mountains are fragile ecosystems, highly susceptible to global climate change and local human impacts. Among the latter, human-mediated plant invasions are increasingly becoming a worldwide phenomenon. The lodgepole pine (Pinus contorta) is a highly invasive pine because of its ecological tolerances and fast growth. Pinus contorta invasions can drastically alter the abiotic environment and soil conditions for native above-below ground communities. Pinus contorta was deliberately introduced to Patagonia in the '70s and rapidly invaded natural areas outside of the original plantations, particularly invading previously unforested areas such as the alpine regions above the local Nothophagus treeline. We studied a 20 years pine invasion occurring at an alpine plateau above the treeline in northern Patagonia, Argentina. We quantified the diversity and composition of native plants, plant-mutualistic microbiota (e.g. fungi, bacteria), and arthropods communities. In addition, we measured changes in plant functional diversity, using leaf traits as a proxy for the plant species responses to the presence of pines. Furthermore, we identified pairwise plant-plant, plant-soil microbiome interactions to construct layered multi-trophic networks. We quantified the changes in species composition, linkage pattern, and network topological structure along a chronosequence of pine invasion. Firstly, we hypothesize that an incongruent topology exists in the structure among individual trophic layers of the multi-trophic network. Secondly, we hypothesize that changes in above-ground interactions lag behind those happening at below-ground. The results of this study will likely offer new mechanistic insights into the reorganization of multi-trophic communities in novel ecosystems.

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