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Temporal changes in ladybird species assemblages coinciding with the arrival of Harmonia axyridis in the UK

Brown, P. M. J.; Frost, R.; Sparks, T.; Doberski, J.; Roy, Helen. 2009 Temporal changes in ladybird species assemblages coinciding with the arrival of Harmonia axyridis in the UK. [Lecture] In: 1st meeting of the IOBC WPRS study group Benefits and Risks associated with Exotic Biological Control Agents, Switzerland, 6-10 September 2009.

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Abstract/Summary

Temporal changes in ladybird species assemblages were studied at seven sites in various arboreal habitats (lime, pine and mixed trees/vegetation) in Cambridgeshire, England from 2006 to 2008. The impact of Harmonia axyridis and other factors (e.g. weather, prey availability) on native ladybirds was assessed. In year one H. axyridis was present but not abundant in Cambridgeshire and was recorded only in very small numbers (0.2% of total ladybirds recorded; n = 1506) in our surveys. In year three H. axyridis was the most abundant species and was breeding at five of the seven sites (pine tree sites were the exceptions). It accounted for 40.3% of the total ladybirds recorded (n = 1513). Only two other species (Aphidecta obliterata and Anatis ocellata) increased in number over the three years, while 13 species decreased. The generalist aphidophagous species Adalia 2-punctata, Coccinella 7-punctata and Propylea 14-punctata suffered the greatest declines. In an attempt to quantify possible levels of intraguild predation, genetic studies have commenced to detect native ladybirds in the guts of H. axyridis collected at some of the survey sites.

Item Type: Publication - Conference Item (Lecture)
Programmes: CEH Topics & Objectives 2009 onwards > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity > BD - 1.1 - Standards for data collection, quality, management and integration ...
CEH Topics & Objectives 2009 onwards > Biodiversity > BD Topic 3 - Managing Biodiversity and Ecosystem Services in a Changing Environment > BD - 3.1 - Develop methods to quantify the link between biodiversity ..
CEH Topics & Objectives 2009 onwards > Biodiversity > BD Topic 2 - Ecological Processes in the Environment
CEH Topics & Objectives 2009 onwards > 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 onwards > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity > BD - 1.3 - Long-term/large-scale monitoring and experiments ...
CEH Sections: Pywell
NORA Subject Terms: Zoology
Ecology and Environment
Date made live: 18 Feb 2010 15:31
URI: http://nora.nerc.ac.uk/id/eprint/8344

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