United Kingdom Butterfly Monitoring Scheme: site indices 2019
THIS DATASET HAS BEEN SUPERSEDED.
This dataset is updated annually with new data and may also include corrected data. We recommend using the most up-to-date dataset unless there is a need for a dataset pertaining to a particular time period required for analysis.
If you need access to this archived version, please contact the UK-SCAPE Programme Office
Site indices are only calculated at sites with sufficient monitoring visits throughout the season, or for targeted reduced effort surveys (timed observations, larval web counts and egg counts) where counts are generally obtained as close to the peak of the flight period as possible and are subsequently adjusted for the time of year and size of the site (area of suitable habitat type for a given species). Wider Countryside Butterfly Survey (WCBS) sites are thus excluded because they are based on very few visits from which indices of abundance are not calculated. For transect sites, a statistical model (a General Additive Model, 'GAM') is used to impute missing values and to calculate a site index. Each year most transect sites (over 90%) produce an index for at least one species and in recent years site indices have been calculated for over 2,000 sites across the UK.
Site indices are subsequently collated to contribute to the overall 'Collated Index' for each species, which are relative measures of the abundance of each species across a geographical area, for example, across the whole UK or at country level for England, Scotland, Wales or Northern Ireland. Individual site indices are important in informing conservation management as not all sites show the same patterns for each species and likely reflect a combination of local climate and habitat management at the site.
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
- Study area
- Temporal extent
2019-04-01 to 2019-09-30
Provenance & quality
- Topic categories
- Biodiversity, Biodiversity, Biodiversity, Monitoring and Observation Systems, UK Butterfly Monitoring Scheme, UK-SCAPE
- INSPIRE Theme
- Environmental Monitoring Facilities
- Natural Environment Research Council Award: NE/R016429/1
- Spatial representation type
- Tabular (text)
- Spatial reference system
- OSGB 1936 / British National Grid
- Last updated
- 04 May 2022 15:20