Wider Countryside Butterfly Survey
Enter your Wider Countryside Butterfly Count
The Wider Countryside Butterfly Survey (WCBS) will be running in 2013 at a welcome higher resource level for training and promotion, as a collaborative project with BTO and CEH. Many thanks to all of you who took part and helped to encourage participation in the WCBS. Last year 771 random 1km squares were covered by over 600 recorders - a fabulous achievement and a 17% increase in coverage compared to 2011.
The 2012 WCBS
newsletter is now available in pdf format (452 KB).
New recorders are very welcome and there are still squares available so let's
try and hit our 1000 square target this year. The survey is co-ordinated
separately by the BTO and Butterfly Conservation, although the method is exactly
the same. The Insect Flower Search Pilot will not be happening this year. Here's how to take part:
Butterfly Conservation recorders
If you surveyed a Butterfly Conservation WCBS square (not a BTO BBS square) and
wish to continue with the survey, then please download forms and instructions from
the bottom of the page or contact the WCBS co-ordinator via email
firstname.lastname@example.org or phone 01929 406006 to receive information
in the post or to receive a copy of your route map.
If you wish to start the survey on a new square this year then please get in touch
with the WCBS co-ordinator to be allocated a random square close to your home.
BTO Breeding Bird Survey recorders
If you already take part in the BTO BBS and if you are continuing the survey from
last year then you will receive details from the BTO in May.
If you are a BTO BBS recorder and wish to start the survey this year then please
contact email@example.com to register and take part.
The Small Copper – one of a number
of wider countryside species
Through the UKBMS project, Butterfly Conservation and the Centre for Hydrology and
Ecology have developed a method for a new monitoring scheme that aims to more effectively
monitor the changing abundance of widespread butterfly species across the general
This new scheme runs in parallel with UKBMS transect monitoring, which is very effective
at monitoring habitat specialist butterflies and lowland semi-natural habitats,
and the BNM project which acts as the main source of information on where butterflies
Wider countryside monitoring is organised in partnership with the
British Trust for Ornithology (BTO).
titles below will show that piece of information. However, you can also chose to
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The design of a new scheme
New monitoring is required, to more
accurately assess the changing
abundance of butterflies in lowland
pasture and other widespread
Strong emphasis has been placed on making sure that the WCBS is both scientifically
sound (by sampling of the countryside through random sampling) and
efficient (a scheme with fewer visits to account for the fact that
butterfly species are now uncommon across much of the general countryside).
Through consulting widely in 2005/6 and successful pilot years in 2007/8, the method
we have come up with is based on the BTO’s Breeding Bird Survey (the ‘BBS’),
counting along two parallel 1-km long transects subdivided into 10 sections, located
within randomly selected 1-km squares. The differences being that butterflies
are counted in a more restricted area than for birds and at different times of the
day. Only 2-4 visits are required compared to 26 on transects.
Results from 2007 field testing
Over 250 volunteers took part in the
pilot studies in 2007
310 squares surveyed in 2007 by BC (green circles)
and BTO (blue squares) recorders
Good coverage was achieved across Great Britain with 310 squares surveyed. In total
181 BBS squares were surveyed by 165 recorders, nearly double the prediction, and
only 33 squares received just one visit. 99 squares were surveyed by 86 recorders
in the four selected Butterfly Conservation Branches (Highland, Norfolk, South Wales,
Somerset and Bristol) with a further 30 completed by staff (total= 129). 50 squares
were visited during May-June to pick up early flying species. The majority of squares
were in England (258) followed by Wales (31), Scotland (20) and one square in Northern
In spite of the poor weather 42 butterfly species were seen across the UK, including
nearly all of the target wider countryside species (excluding the White-letter Hairstreak),
plus a good range of migrants and rarer species such as the Large Heath and White
Admiral. On average nearly 100 butterflies and ten species were seen per square
based on two summer visits, showing that taking part in this survey in the future
should produce a good diversity of butterflies for recorders. There were, however,
15 squares where the recorder saw no butterflies on single visits, although at the
other extreme one recorder in Kent counted a staggering 672 butterflies on one visit.
The most species rich squares were in Norfolk and Somerset both with 15 species
recorded on single visits. Of particular interest were the high occupancy rates
(percentage squares occupied) of the Small Heath (20%) and the Wall Brown
(5%) which are UK Biodiversity Action Plan priority species in decline. It wasn’t
just butterflies that caught recorder’s eyes - dragonflies were recorded on
more than 50% of squares and day-flying moths were recorded on a quarter of squares.
Results from 2008 field testing
Wider countryside field testing was repeated in 2008 to further refine field methods
and to compare abundance and occupancy (number of squares occupied) in common species
between 2007 and 2008 a) within wider countryside squares and b) in comparison to
All recorders that took part in 2007 were invited to take part again in 2008. 192
squares were surveyed in 2008- 62% of last year's total (310). The 38% decrease
in uptake was mainly due to very unsettled weather in 2008 and uncertainties over
the roll out.
On average 11 species and 104 individuals were seen per square based on 2 summer
visits, which is the same as 2007 (10 species and 95 individuals). In total 40 species
were recorded in 2008 with 5 species lost compared to 2007 and 3 species gained,
all of which are habitat specialists recorded in low numbers. Two key target species
of the WCBS are the Small Copper and the Small Heath, both of which increased in
abundance and in the number of squares occupied in 2008. The decline in the Small
Tortoiseshell was detected using the new method, with 17% fewer squares occupied
in 2008. Overall the occupancy figures were relatively stable which is to be expected
over a short time scale and provides evidence that the method is robust.
Results from the roll out in 2009
Location of the WCBS squares-
360 BTO BBS squares (blue) and
403 Butterfly Conservation squares (green)
Following four years of pilot studies, the WCBS was formally launched in 2009. The
WCBS is the first UK-wide survey of butterfly abundance based on random sampling.
In spite of limited resources for promotion, there was a fantastic response by volunteer
recorders. In total 1642 visits were made to 763 1-km squares (see map) by 611 recorders,
who collectively walked 3300 km of survey line, counting 119,000 butterflies of
The full feedback newsletter can be downloaded
The most widely recorded species over the core July and August period was the Large
White, occurring in nearly 90% of squares, whilst the most abundant species was
the Meadow Brown with approximately 15,000 individuals counted. Two Browns (Meadow
Brown, Gatekeeper) and three Whites (Large White, Small White, Green-veined White)
accounted for two thirds of all butterflies counted.
On average, recorders saw 11 species and 160 butterflies per square (based on two
visits). This represents a marked increase in numbers from the pilot study years,
when around 100 butterflies were seen in the same period. This increase could be
due to a good year for migrant species such as the Painted Lady which was present
in 83% of squares and ranked 4th in total abundance compared to 2008 when it ranked
26th and also Large White which jumped three places to 1st position in 2009. Encouragingly
the Small Copper, a species of intermediate range and abundance, was seen in over
a quarter of squares and moved five places up the table to become the 14th most
commonly seen species.
Looking back to 2008, butterfly numbers are up by nearly a third and 1-2 more species
were seen per visit. With three years of data from 2007-2009 we will be able to
look at changes in butterfly abundance in the wider countryside and the possible
reasons for change.
The Insect Flower Search Pilot study was very successful with around a third of
recorders taking part. The Common Carder Bumblebee was the most widespread species
and the Marmalade Hoverfly was the most abundant. The pilot study will not be continuing
in 2010 but it shows that recorders are keen to look for other insects in the countryside.
Results from the 2011 survey
Location of the WCBS squares-
276 BTO BBS squares (blue)
362 Butterfly Conservation squares (green)
85 Contract (yellow)
The Wider Countryside Butterfly Survey (WCBS) is the main scheme for monitoring
population changes of the UK's common and widespread butterflies. The survey is a
partnership project run jointly by Butterfly Conservation, the British Trust for
Ornithology (BTO) and the Centre for Ecology and Hydrology (CEH). We now have five
years of data (including the pilot years of 2007 and 2008) from the Wider Countryside
Butterfly Survey (WCBS). In 2011, 723 squares were surveyed by 523 recorders who
counted in excess of 67,000 butterflies of 45 species. This is a fantastic recording
effort and we wish to thank everyone who took part.
The newsletter of the 2011 results can be downloaded
On average recorders saw 47 butterflies of seven species per survey made over July
and August compared to 60 butterflies of 7 species per survey in 2010. These data
support anecdotal observations that 2011 was a relatively poor year for common and
widespread butterflies. Almost two-thirds of the butterflies seen comprised of
Meadow Brown, Small White, Green-veined White, Large White and Gatekeeper. The most
widespread (and abundant) species was the Meadow Brown occurring in over 80% of
Due to a grant from Scottish Natural Heritage coverage was boosted in Scotland, giving
more representative coverage for a number of northerly distributed species including
Scotch Argus. The Essex Skipper had a good year as did the Red Admiral. However, it
wasn't all good news; both the Small Tortoiseshell and Common Blue had poor years.
Participants once again recorded day-flying moths in 146 squares, Silver-Y was the most
widespread species and Six-spot Burnet was the most abundant. Dragonflies and
damselflies were recorded in 222 squares Common Darter was the most widespread and
abundant species for the third year running.
Results from the 2012 survey
Location of the WCBS squares-
334 BTO BBS squares (blue)
437 Butterfly Conservation squares (pink)
The Wider Countryside Butterfly Survey (WCBS) is the main scheme for monitoring population changes of the UK's common and widespread butterflies. The survey is a partnership project run jointly by Butterfly Conservation, the British Trust for Ornithology (BTO) and the Centre for Ecology and Hydrology (CEH). We now have six years of data (including the pilot years of 2007 and 2008) from the Wider Countryside Butterfly Survey (WCBS). In 2012, 771 squares were surveyed by 648 recorders who counted in excess of 64,000 butterflies of 46 species. This is a fantastic recording effort and we wish to thank everyone who took part.
The newsletter of the 2012 results can be downloaded
It was a good year for some of the grass-feeding Satyrid (Brown) species. For the fourth consecutive year Meadow Brown was the most abundant butterfly with 18,629 individuals counted. It was also the most wide spread species occurring in almost 90% of squares. Meadow Brown, Gatekeeper, Small White, Ringlet and Green-veined white accounted for over two-thirds of butterflies observed.
For the majority of species it was a poor year – the worst in a four year series. There has been a year-on-year decline in mean butterfly abundance in each year of the WCBS. On average, recorders saw 44 butterflies of four species per survey made over July and August compared to 80 butterflies of 8 species per survey in 2009.
Participants once again recorded day-flying moths in 222 squares, Silver-Y was the most widespread and abundant species. Dragonflies and damselflies were recorded in 259 squares; Common Blue Damselfly was the most abundant species and Common Hawker the most widespread species.
To take part in the WCBS please contact the WCBS co-ordinator:
Dr Zoë Randle
Tel: 01929 406006
To take part on an existing BTO BBS square please contact the BBS National Organiser:
Tel: 01842 750050
Entering your data online
The online data entry system is available to use. Please enter your data by the
end of September.
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