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Evolutionary ecology of microsporidia associated with the invasive ladybird Harmonia axyridis

Insect Science 2015年第3期22卷 313-324页

作者： Andreas Vilcinskas Henrike Schmidtberg Arnaud Estoup Ashraf Tayeh benoit facon Heiko Vogel Institute of Phytopathology and Applied Zoology Justus-Liebig-University of Giessen Heinrich-Buff-Ring 26-32 Giessen D-35392 Germany Fraunhofer Institute for Molecular Biology and Applied Ecology Winchester Strasse 2 Giessen D-35394 Germany UMR 1062 CBGP Inra 34988 Montpellier France Max Planck Institute for Chemical Ecology Hans-Knoll-Strasse 8 D-07745 Jena Germany

Invasive species are characterized by the rapid growth and spread of their populations after establishing a foothold in new habitats, and there are now many examples of such species negatively affecting biodiversity and the economy. It is unclear why some species can become successful invaders, whereas most （even if closely related） remain noninvasive. We previously proposed a hypothesis that parasites associated with invading species can promote their invasive success if they are harmless toward the invaders but harmful to their competitors and/or predators in the newly colonized habitat. Here we discuss whether microsporidia that have recently been discovered in the invasive ladybird Harmonia axyridis contribute to its invasive success. We show that all H. axyridis beetles sourced from diverse collection sites all over the world carry abundant microsporidia. This suggests that both native and invasive H. axyridis populations are associated with these tolerated parasites, which were likely to have existed in native populations before expansion rather than being acquired in newly colonized areas. We describe the pathogenesis of the microsporidia during different developmental stages of H. axyridis and we address the possibility that the predation of its infected eggs and larvae by competing native ladybird species may lead to their infection and ultimately to their decline. Finally, we discuss our initial hypothesis： microsporidia that are tolerated by an invasive vector insect can be active against susceptible native competitors and/or predator species.

关键词： Coccinellidae evolutionary ecology Harmonia aryridis innate immunity intraguild predation invasion biology microsporidia

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