Consequences for flying insect communities after the eradication of the black rat (Rattus rattus) and ice plant (Carpobrotus spp.) within the framework of the ecological restoration programme on Bagaud Island (Port-Cros national Park, France): preliminary results.

• Main Authors: Braschi, Julie, Caceres, Mickaël, Delcourt, Ninon, Tournier, Florian, Ponel, Philippe
• Other Authors: Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement IRD : UMR237-Centre National de la Recherche Scientifique (CNRS), Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: French
• Published: HAL CCSD 2017
• Subjects: espèces exotiques envahissantes; biodiversité insulaire; pièges Polytrap; arthropodes; coléoptères; [SDE]Environmental Sciences; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Rotten; Rattus rattus
• Online Access: https://hal.science/hal-02010026; https://hal.science/hal-02010026/document; https://hal.science/hal-02010026/file/Braschi%20et%20al.%202017%20-%2002%20-%20Conse%CC%81quences%20sur%20les%20communaue%CC%81s.pdf

International audience Bagaud Island (Îles d’Hyères archipelago in Var, France), has experienced two major perturbations of human origin in the past few hundred years: the introduction of the invasive black rat (Rattus rattus) and ice plant (Carpobrotus spp.). An eradication programme for these two taxa was launched in 2010 by Port-Cros national Park. The project calls for the monitoring of animal and plant communities over a ten-year period, including pre-eradication levels at time zero. Monitoring of the island’s arthropod communities for this project includes sampling of flying insect communities using interception traps (Polytrap® type). Here we report the preliminary results from three trap stations, at time zero (2011) and in two post-eradication years (2013 and 2015). Flying insect communities have shown both structural and functional changes: diversity decreased among coleoptera and hymenoptera, with the number of saprophagous coleoptera individuals first increasing and then dropping significantly in 2015. These changes must be interpreted with caution, as several factors may have exercised a synergic influence alongside the eradication of the invasive taxa. Among these influences, piles of uprooted Carpobrotus serve as a source of rotten plant matter favourable to many insects, and climatic conditions vary significantly from year to year. Analysis of a greater number of traps over a longer period will allow for a more accurate interpretation. L’île de Bagaud (archipel des îles d’Hyères, Var, France) a été soumise à deux perturbations majeures d’origine anthropique au cours des derniers siècles : l’invasion du rat noir (Rattus rattus) et celle des griffes de sorcière (Carpobrotus spp.). Un programme d’éradication de ces deux taxons a été lancé en 2010 par le Parc national de Port-Cros. Ce projet prévoit un suivi des communautés animales et végétales sur 10 ans, précédé d’un “état zéro” pré-éradications. Parmi les suivis qui ont été menés sur les communautés d’arthropodes figure celui des insectes ...