Abstract
The harlequin ladybird, Harmonia axyridis, is considered to be one of the most invasive insect species worldwide. Its invasion success and extreme speed of range expansion has been partially attributed to weak control of its populations by natural enemies. Previously published data on emergence rates of the hymenopteran parasitoid Dinocampus coccinellae support the enemy release hypothesis: H. axyridis has been consistently less successfully parasitized compared to native ladybird species. In this study, we show that since 2016, i.e., 10 years after its arrival in Central Europe, several populations of H. axyridis in the Czech Republic have a very high prevalence of D. coccinellae parasitism. D. coccinellae emerged from 46% of H. axyridis individuals in the most parasitized population. Moreover, H. axyridis was more parasitized than the native Coccinella septempunctata in seven of nine investigated co-occurring populations. The meta-analytically pooled estimate of D. coccinellae emergence rate from H. axyridis across the Czech populations (this study) is thirteen times higher than the pooled estimate for invasive populations of this beetle elsewhere (historical data up to 2016). We hypothesize that some Central European populations of D. coccinellae have evolved to overcome the immune system of H. axyridis, which was previously thought to be responsible for the high larval mortality of D. coccinellae. As parasitism rates are highly variable in time and space, we encourage future research investigating the determinants of parasitoid prevalence in H. axyridis and other large ladybird species on a continental scale.
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Acknowledgements
We are grateful to Helena Antošová, Daniel Bernt, Lukáš Fiedler, Patrycja Siwek and Mona Awad for taking care of our ladybirds in the laboratory, and to Danny Haelewaters and three reviewers for their insightful comments and suggestions on the manuscript. We thank Joel Brown for English edits. This study was supported by the Internal Grant Agency of the Faculty of Environmental Sciences, Czech University of Life Sciences Prague (Grant No. 42110/1312/3145), and by institutional research funding (IUT20-33) of the Estonian Ministry of Education and Research.
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Knapp, M., Řeřicha, M., Maršíková, S. et al. Invasive host caught up with a native parasitoid: field data reveal high parasitism of Harmonia axyridis by Dinocampus coccinellae in Central Europe. Biol Invasions 21, 2795–2802 (2019). https://doi.org/10.1007/s10530-019-02027-4
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DOI: https://doi.org/10.1007/s10530-019-02027-4