Invasive alien predator causes rapid declines of native European ladybirds

Roy, Helen E. and Adriaens, Tim and Isaac, Nick J.B. and Kenis, Marc and Onkelinx, Thierry and Martin, Gilles San and Brown, Peter M.J. and Hautier, Louis and Poland, Remy and Roy, David B. and Comont, Richard and Eschen, René and Frost, Robert and Zindel, Renate and Van Vlaenderen, Johan and Nedvěd, Oldřich and Ravn, Hans Peter and Grégoire, Jean-Claude and de Biseau, Jean-Christophe and Maes, Dirk (2012) Invasive alien predator causes rapid declines of native European ladybirds. Diversity and Distributions. ISSN 1366-9516

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Abstract

Aim: Invasive alien species (IAS) are recognized as major drivers of biodiversity loss, but few causal relationships between IAS and species declines have been documented. In this study, we compare the distribution (Belgium and Britain) and abundance (Belgium, Britain and Switzerland) of formerly common and widespread native ladybirds before and after the arrival of Harmonia axyridis, a globally rapidly expanding IAS. Location:  Europe. Methods:  We used generalized linear mixed-effects models (GLMMs) to assess the distribution trends of eight conspicuous and historically widespread and common species of ladybird within Belgium and Britain before and after the arrival of H. axyridis. The distribution data were collated largely through public participatory surveys but verified by a recognized expert. We also used GLMMs to model trends in the abundance of ladybirds using data collated through systematic surveys of deciduous trees in Belgium, Britain and Switzerland. Results:  Five (Belgium) and seven (Britain) of eight species studied show substantial declines attributable to the arrival of H. axyridis. Indeed, the two-spot ladybird, Adalia bipunctata, declined by 30% (Belgium) and 44% (Britain) over 5 years after the arrival of H. axyridis. Trends in ladybird abundance revealed similar patterns of declines across three countries. Main conclusion:  Together, these analyses show H. axyridis to be displacing native ladybirds with high niche overlap, probably through predation and competition. This finding provides strong evidence of a causal link between the arrival of an IAS and decline in native biodiversity. Rapid biotic homogenization at the continental scale could impact on the resilience of ecosystems and severely diminish the services they deliver.

Item Type: Journal Article
Additional Information: Citation: Roy, H.E. et al., 2012. Invasive alien predator causes rapid declines of native European ladybirds. Diversity and Distributions, 18(7), pp.717-725..
Faculty: Faculty of Science & Technology
Depositing User: Mr I Walker
Date Deposited: 29 Jul 2013 10:45
Last Modified: 07 Jul 2016 12:51
URI: http://arro.anglia.ac.uk/id/eprint/297108

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