The changing status of the Chalkhill Blue butterfly Polyommatus coridon in the UK: the impacts of conservation policies and environmental factors

Brereton, Tom M.; Warren, Martin S.; Roy, David B. ORCID: https://orcid.org/0000-0002-5147-0331; Stewart, Katherine. 2008 The changing status of the Chalkhill Blue butterfly Polyommatus coridon in the UK: the impacts of conservation policies and environmental factors. Journal of Insect Conservation, 12 (6). 629-638. https://doi.org/10.1007/s10841-007-9099-0

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Abstract/Summary

The Chalkhill Blue Polyommatus coridon is a widespread butterfly of lowland calcareous grassland in southern Britain and is considered a good indicator of habitat condition. Polyommatus coridon has been identified as a Species of Conservation Concern in the UK Biodiversity Action Plan due to a greater than 25% decline in range size since the 1950s, with losses due to the combined effects of habitat destruction, agricultural intensification and neglect. Analysis of annual butterfly monitoring data (transects) collected at 161 sites from 1981 to 2000 show a three-fold population recovery had occurred. The increases were at established sites, with no re-colonisations or range expansion detected. The 1980s population increase coincided with increases across the species range in stock and rabbit Oryctolagus cuniculus grazing, as well as greater protection and management of sites through protected areas and nature reserves. During the 1990s agri-environment schemes were thought to be the main conservation and policy mechanism driving the favourable conservation status of P. coridon, by facilitating appropriate habitat restoration and management. Weather played a part in the species recovery, with warm, but wet summers associated with increases in abundance. The research provides strong evidence of an important conservation success with the UK Biodiversity Action Plan, with implications for other specialist biodiversity.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1007/s10841-007-9099-0
Programmes:	CEH Programmes pre-2009 publications > Biodiversity > BD01 Conservation and Restoration of Biodiversity > BD01.2 Trends and drivers of change among taxa
UKCEH and CEH Sections/Science Areas:	Pywell
ISSN:	1366-638X
Additional Keywords:	Abundance trends, Conservation policy, Grazing, Agri-environment schemes, Biodiversity action plans Habitat condition
NORA Subject Terms:	Ecology and Environment General > Science Policy
Date made live:	29 Jun 2009 13:56 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/7048

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