Myzus ascalonicus, an Aphid Recently Introduced to Sub-Antarctic Islands, Prefers Native to Exotic Host-Plants

• Published in: Environmental Entomology
• Main Author: Hullé, Maurice
• Other Authors: Institut de Génétique, Environnement et Protection des Plantes (IGEPP), Institut National de la Recherche Agronomique (INRA)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), "Institut Paul Emile Victor" IPEV 136, "Institut Ecologie et Environnement" of the "Centre National de la Recherche Scientifique" INEE-CNRS (Zone Atelier de Recherche sur l'Environnement antarctique et subantarctique); Agence Nationale de la Recherche ANR 07 Vulnerability-EVINCE
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: EVOLUTION; DIVERSITY; HYPOTHESIS; IMPACTS; DEFENSE; KERGUELEN; INSECT HERBIVORES; PRINGLEA-ANTISCORBUTICA; CHERRY-OAT APHID; INCREASED COMPETITIVE ABILITY; host plant; Myzus ascalonicus; Kerguelen Islands; biological invasion; Indian Oceanic Islands; [SDV]Life Sciences [q-bio]; Antarctic; Kerguelen; Indian; Antarc*
• Online Access: https://hal.archives-ouvertes.fr/hal-01208650; https://doi.org/10.1603/EN12057

International audience Newly introduced phytophagous insects can affect native and introduced plant species. If the native plant species evolved without undergoing selective pressure from these insects, insect-plant interactions may be different for native and introduced plant species. In particular, this difference may involve mechanisms of plant defense against herbivores. If native plants lack such mechanisms, they may be more palatable to insects than exotic plants. On isolated sub-Antarctic islands, native plant species have evolved in the absence of sap-feeding insects, subsequently introduced a few decades ago. In this study, performance of an introduced aphid species, Myzus ascalonicus Doncaster, was experimentally compared on three native [Pringlea antiscorbutica Hook.f., Acaena magellanica (Lam) Vah, and Leptinella plumosa Hook.f.] and three exotic plant species (Taraxacum officinale F. H. Wigg, Cerastium fontanum Baumg., and Senecio vulgaris L.) found on the Kerguelen Islands. Counts and weights of aphid colonies were 2-7 times higher on native plants than on exotic plants depending on experimental conditions. The results are discussed in light of the possibility of an absence or ineffective defense mechanisms in native plants.