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Grass Feeding Butterflies Defy Deluge

by Butterfly Conservation
Date: 17/01/2013

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Grass-feeding butterflies defied the second wettest year on record to enjoy a bumper 2012 across the UK countryside, according to a new scientific survey.

Last year's incessant rain prompted substantial grass growth and provided good conditions for some grassland species such as the Meadow Brown, Ringlet and Gatekeeper.

The Wider Countryside Butterfly Survey (WCBS) revealed that the Meadow Brown enjoyed its best year since the start of the scheme with almost twice as many counted than in 2011.

But overall 2012 proved to be a washout with recorders seeing 43% fewer species on average than in 2011 during survey counts.

The WCBS involves counting butterflies in more than 700 randomly generated 1km-squares across the UK countryside.

The scheme helps assess the health of butterfly populations across the wider countryside, rather than specially managed hotspots such as nature reserves.

Last year, recorders saw on average 44 butterflies of four species per-survey made over July and August compared with 2011 when 47 butterflies from seven species were seen on average. In 2009 an average of 80 butterflies and eight species were recorded per-survey.

A relatively dry start to 2012 followed by near continual rain saw bumper grass growth providing some species with an abundance of their favoured food plants.

The Meadow Brown thrived as a result with more than 18,500 counted, almost twice as many as in 2011. This was the most widespread butterfly for the third successive year being seen in 89% of squares surveyed.

The Ringlet also enjoyed a good year and was found in almost two-thirds of squares compared to half of squares in 2011. Another grass-feeder, the Gatekeeper, was also more widespread than 2011.

But months of unseasonable wet weather proved problematic for many other species - there were 38 visits when recorders saw no butterflies at all.

Garden favourite the Small Tortoiseshell suffered further declines with less than half the number counted than in 2011. This once widespread species was present in less than half of the squares sampled.

The Common Blue also struggled and was found in 50% fewer squares than in 2011. The Wall butterfly also suffered following a series of declines and was found in just 4% of squares compared to 9% in 2009.

WCBS Co-ordinator Dr Zoe Randle said: "Last year was fantastic for the Meadow Brown however the overall picture is that butterfly populations are suffering in the wider countryside and this needs to be addressed urgently."

Kate Risely, who co-ordinates the BTO butterfly surveyors, said: "Record-breaking rainfall during the summer months affected birds and butterflies alike, and many species suffered a disastrous season. Credit is due to all the volunteer recorders who braved the weather and collected this valuable data on butterfly populations."

The WCBS is run by Butterfly Conservation, the British Trust for Ornithology (BTO) and the NERC Centre for Ecology & Hydrology (CEH) as part of the United Kingdom Butterfly Monitoring scheme (UKBMS).



CONTACTS
For interviews and images contact the Butterfly Conservation Press Office on:
t: 01929 406 005
e: news@butterfly-conservation.org.

To contact the BTO: kate.risely@bto.org and NERC Centre for Ecology & Hydrology (CEH): Barnaby Smith bpgs@ceh.ac.uk 07920 295384

The WCBS is funded by a multi-agency consortium including the Countryside Council for Wales, Defra, the Joint Nature Conservation Committee, Forestry Commission, Natural England, the Natural Environment Research Council and Scottish Natural Heritage. The WCBS is indebted to all volunteers who contribute data to the scheme.

Butterfly Conservation is the largest charity of its type in the world. Our aim is the conservation of butterflies, moths and their habitats. We run conservation programmes for more than 100 threatened species and manage over 30 nature reserves. www.butterfly-conservation.org.

The BTO is the UK's foremost independent bird research organisation and organises a range of annual and periodic surveys, mainly on birds, and including the BTO/JNCC/RSPB Breeding Bird Survey. Information on population trends in birds and other wildlife are provided on our website (www.bto.org) and you can follow the latest news and developments via twitter @_BTO.

The NERC Centre for Ecology & Hydrology (CEH) is the UK's Centre of Excellence for integrated research in the land and freshwater ecosystems and their interaction with the atmosphere. CEH is part of the natural Environment Research Council, employs more than 450 people at four major sites in England, Scotland and Wales, hosts over 150 PhD students and has an overall budget of £35m. CEH tackles complex environmental challenges to deliver practicable solutions so that future generations can benefit from a rich and healthy environment. www.ceh.ac.uk. You can follow the latest developments in CEH research via twitter @CEHScienceNews and our rss news feed http://www.ceh.ac.uk/rss.xml

If you have any questions or require more information about this press release, please contact Butterfly Conservation by email.

About Our Press Releases

Butterfly Conservation Warwickshire regularly issue press releases on issues in relation to butterfly and moth conservation in the Coventry, Warwickshire and Solihull area alongside occasional press releases covering national stories from Butterfly Conservation's head office.

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Notes For Editors
Butterfly Conservation is the largest conservation charity of its type in Europe with over 13,000 members in the UK. Its aim is the conservation of butterflies, moths and their habitats. It runs conservation programmes on over 60 threatened species of butterfly and moth, organises national butterfly recording and monitoring schemes, and manages over 30 nature reserves.

Further information at: www.butterfly-conservation.org