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Decline in native ladybirds in response to the arrival of Harmonia axyridis: early evidence from England

Brown, Peter M.J.; Frost, Robert; Doberski, Julian; Sparks, Tim; Harrington, Richard; Roy, Helen E.. 2011 Decline in native ladybirds in response to the arrival of Harmonia axyridis: early evidence from England. Ecological Entomology, 36 (2). 231-240. 10.1111/j.1365-2311.2011.01264.x

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Abstract/Summary

1. Harmonia axyridis (Coleoptera: Coccinellidae) is an invasive nonnative ladybird in Europe, where it was introduced as a biological control agent of aphids and coccids. 2. This study assesses changes to ladybird species assemblages, in arboreal habitats, over a 3-year period encompassing the invasion phase of H. axyridis in eastern England. The effects of H. axyridis and other factors (weather and prey availability)on native ladybirds are assessed. 3. Harmonia axyridis increased from 0.1% to 40% of total ladybirds sampled, whilst native aphidophagous species declined from 84% to 41% of total ladybirds. The actual number of native aphidophagous ladybirds per survey decreased from a mean of 19.7 in year 1, to 10.2 in year 3. 4. Three ladybird species in particular experienced declines: Adalia bipunctata,Coccinella septempunctata, and Propylea quattuordecimpunctata. Harmonia axyridis was the most abundant species by the end of the study. 5. The decline in native aphidophagous ladybirds could be attributed to competition for prey and intraguild predation of eggs, larvae, and pupae by H. axyridis. Physiological and behavioural traits of H. axyridis are likely to confer an advantage over native ladybird species.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1365-2311.2011.01264.x
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 1 - Observations, Patterns, and Predictions for Biodiversity > BD - 1.4 - Quantify and model interactions to determine impacts ...
CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity > BD - 1.3 - Long-term/large-scale monitoring and experiments ...
CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 2 - Ecological Processes in the Environment > BD - 2.2 - Quantify the impact of invasive species, pathogens ...
CEH Sections: Pywell
ISSN: 0307-6946
Additional Keywords: Adalia bipunctata, biological control, Coccinellidae, harlequin ladybird, intraguild predation, invasive species, non-target effects
NORA Subject Terms: Zoology
Ecology and Environment
Date made live: 18 Aug 2011 11:03
URI: http://nora.nerc.ac.uk/id/eprint/14962

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