Botham, M.; Brereton, T.; Harris, S.; Harrower, C.; Middlebrook, I.; Randle, Z.; Roy, D.B.

United Kingdom Butterfly Monitoring Scheme: site location data 2019

This dataset provides the details of all sites on which butterflies have been monitored as part of the UK Butterfly Monitoring Scheme (UKBMS). This includes all standard UKBMS transect sites, Wider Countryside Butterfly Survey (WCBS) sites and targeted species survey sites (timed counts, single-species transects, larval web and egg counts). Data includes the location within the UK, the length and number of sections for the butterfly transect on each site and the number of years each transect has been monitored. The location of some sites are sensitive and are excluded from this dataset. A full set of UKBMS monitoring sites is available in a separate dataset requested via the UKBMS website.
The UKBMS started in 1976 with fewer than 50 sites. Since then the number of sites monitored each year has increased to several thousand. There are year new sites each and a small number where the transect is no longer surveyed. Details of this are provided in the site dataset in the form of the first and last year in which each site was surveyed.

The majority of site data is provided by recorders at the time a transect is created. Site data are crucial in order to determine where extra recording effort is required and to investigate where butterfly populations are changing most and thus where conservation should be targeted, including across different habitat types.

The UK Butterfly Monitoring Scheme is organized and funded by Butterfly Conservation (BC), the Centre for Ecology & Hydrology (CEH), the British Trust for Ornithology (BTO), and the Joint Nature Conservation Committee (JNCC). The UKBMS is indebted to all volunteers who contribute data to the scheme.

This work was supported by the Natural Environment Research Council award number NE/R016429/1 as part of the UK-SCAPE programme delivering National Capability.

Publication date: 2020-07-17

Get the data

This dataset is available under the terms of the Open Government Licence

Format of the data: Comma-separated values (CSV)

You must cite: Botham, M.; Brereton, T.; Harris, S.; Harrower, C.; Middlebrook, I.; Randle, Z.; Roy, D.B. (2020). United Kingdom Butterfly Monitoring Scheme: site location data 2019. NERC Environmental Information Data Centre.


© UK Centre for Ecology & Hydrology

© Butterfly Conservation

© British Trust for Ornithology

© Natural Environment Research Council

© Joint Nature Conservation Committee

The following attribution statement must be included on the catalogue record: Contains UK Butterfly Monitoring Scheme (UKBMS) data © copyright and database right Butterfly Conservation, the Centre for Ecology & Hydrology, British Trust for Ornithology, and the Joint Nature Conservation Committee.


Study area
Temporal extent
1973-04-01    to    2019-09-30

Provenance & quality

Site location data provide details about the linear transect at each UKBMS site. Data on the location and length and width of each transect are provided by the recorder for each site. Data on how long each transect has been monitored is calculated as the time period between when a transect was first and last monitored.


This dataset is included in the following collections

United Kingdom Butterfly Monitoring Scheme (UKBMS) 1976-2019 data

Supplemental information

Related websites:

Correspondence/contact details

Dr Marc Botham
UK Centre for Ecology & Hydrology
Maclean Building, Benson Lane, Crowmarsh Gifford
OX10 8BB
United Kingdom
Dr Tom Brereton
Butterfly Conservation


Botham, M.
UK Centre for Ecology & Hydrology
Brereton, T.
Butterfly Conservation
Harris, S.
British Trust for Ornithology
Harrower, C.
UK Centre for Ecology & Hydrology
Middlebrook, I.
Butterfly Conservation
Randle, Z.
Butterfly Conservation
Roy, D.B.
UK Centre for Ecology & Hydrology

Other contacts

Environmental Information Data Centre
NERC Environmental Information Data Centre

Additional metadata

Topic categories
annual,  Biodiversity butterflies,  England,  Lepidoptera,  Northern Ireland,  Scotland,  UK-SCAPE,  United Kingdom,  Wales
Environmental Monitoring Facilities
Natural Environment Research Council Award: NE/R016429/1
Spatial representation type
Tabular (text)
Spatial reference systems
OSGB 1936 / British National Grid
OSNI 1952 / Irish National Grid
Last updated
25 January 2021 12:39