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

United Kingdom Butterfly Monitoring Scheme: species trends 2019

This dataset provides linear trends, over varying time periods, for the Collated Indices of individual butterfly species across the UK. The main statistical values derived from a linear regression (slope, standard error, P-value) are presented for the entire time series for each species (1976# to the present year), for the last 20 years, and for the last decade. In addition, trends are classified based on the direction and significance of a linear slope together with an estimated percentage change for that time period. These trend data are provided for all UK butterfly species for which we have sufficient data (58 species).

Trends are calculated by performing a linear regression on the annual Collated indices for each species. Collated indices are calculated using a log-linear model incorporating individual site indices from all monitored sites across the UK for a given species in a given year.

Trends across different time series allow us to determine the long and short-term status of individual species. This is enables us to focus conservation and research and also to assess species responses to conservation already in place.

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.

#Because the Collated indices are only calculated for each species in years in which it was recorded on five or more sites, the starting year for the series is later than 1976 for a number of rarer species.

Publication date: 2020-07-17

Where/When

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

Provenance & quality

Trends are calculated by performing a linear regression on the annual Collated Indices for each species. Indices are calculated for all species (across WCBS squares and traditional UKBMS sites) using the Generalised Abundance Index (GAI) method developed in 2016 with an additional modification that the data from each site in each year is weighted in the final stage relative to the proportion of the species flight period surveyed that year for that site. They give a statistical measure of how the abundance of each species has changed on monitored sites since 1976, over the last 20 years, and over the last decade. Because the Collated indices are only calculated for each species in years in which there was sufficient data available, the starting year for the series is later than 1976 for a number of rarer species.

Supplemental information

Correspondence/contact details

Tom Brereton
Butterfly Conservation
 tbrereton@butterfly-conservation.org

Authors

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

Custodian
NERC EDS Environmental Information Data Centre
 info@eidc.ac.uk
Publisher
NERC Environmental Information Data Centre
 info@eidc.ac.uk

Additional metadata

Topic categories
Biota
Keywords
annual,  Biodiversity Biodiversity Biodiversity butterflies,  England Lepidoptera,  Northern Ireland Scotland UK Butterfly Monitoring Scheme UK-SCAPE,  United Kingdom Wales
INSPIRE Theme
Environmental Monitoring Facilities
Funding
Natural Environment Research Council Award: NE/R016429/1
Spatial representation type
Tabular (text)
Spatial reference system
OSGB 1936 / British National Grid
Last updated
12 April 2022 12:52