Harmonia axyridis implicated in native European ladybird declines

Roy, Helen E. ORCID:; Adrians, Tim; Isaac, Nick J.B. ORCID:; Kenis, Marc; Onkelinx, Thierry; Martin, Gilles San; Brown, Peter M.J.; Hautier, Louis; Poland, Remy; Roy, David B. ORCID:; Comont, Richard; Eschen, Rene; Frost, Robert; Zindel, Renate; Van Vlaenderen, Johan; Nedved, Oldrich; Ravn, Hans Peter; Gregoire, Jean-Claude; de Biseau, Jean-Christophe; Maes, Dirk. 2011 Harmonia axyridis implicated in native European ladybird declines. In: 2nd Meeting of the IOBC/WPRS Working Group "Benefits and Risks of Exotic Biological Control Agents", Hluboka, Czech Republic., 30 October - 3 November 2011. (Unpublished)

Before downloading, please read NORA policies.

Download (480kB) | Preview
Official URL:


Rates of global extinction are orders of magnitude higher than historical estimates and show no sign of slowing. The Convention on Biological Diversity and the 10th Conference of the Parties (Nagoya in 2010), identified invasive alien species (IAS) as one of five major pressures driving biodiversity loss, and ultimately extinction of species. However, there are few examples of causal relationships between IAS and species declines. IAS afford a unique opportunity to accurately assess threats to biodiversity because the time at which an IAS arrives within an ecosystem is often known, unlike other drivers of change. We examined trends in distribution of native ladybirds from large-scale and long-term annual citizen-science surveys before and after the arrival of the predatory harlequin (or Asian) ladybird Harmonia axyridis, an IAS that is rapidly expanding across North America and Europe. We report rapid, dramatic and ongoing declines in the distribution of formerly common and widespread native ladybirds in direct response to the arrival of H. axyridis in Belgium and Britain. The dramatic decline of A. bipunctata over the five years following the arrival of H. axyridis is of particular note. Trends in ladybird abundance revealed similar patterns of declines in ladybirds across Belgium, Britain and Switzerland. Together, these parallel analyses show H. axyridis to be displacing native ladybirds with a high niche overlap, probably through predation and competition. Such rapid biotic homogenisation at the continental scale could impact on the resilience of ecosystems and severely diminish the services they deliver.

Item Type: Publication - Conference Item (Paper)
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity > BD - 1.2 - Data collection systems to record and assess changes ...
CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 2 - Ecological Processes in the Environment > BD - 2.2 - Quantify the impact of invasive species, pathogens ...
UKCEH and CEH Sections/Science Areas: Pywell
NORA Subject Terms: Zoology
Ecology and Environment
Date made live: 30 Jan 2012 11:08 +0 (UTC)

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...