10.5285/DDCD1FA7-27D8-4082-93BD-A550C98208CF
Botham, M.S.
https://orcid.org/0000-0002-5276-1405
Centre for Ecology & Hydrology
Brereton, T.
Butterfly Conservation
Harris, S.
British Trust for Ornithology
Harrower, C.
https://orcid.org/0000-0001-5070-5293
Centre for Ecology & Hydrology
Middlebrook, I.
https://orcid.org/0000-0002-0448-9144
Butterfly Conservation
Randle, Z.
Butterfly Conservation
Roy, D.B.
https://orcid.org/0000-0002-5147-0331
Centre for Ecology & Hydrology
United Kingdom Butterfly Monitoring Scheme: species trends 2017
NERC Environmental Information Data Centre
2019
England
Scotland
Wales
Northern Ireland
United Kingdom
Biodiversity
butterfly
lepidopteran
Botham, M.S.
UK Centre for Ecology & Hydrology
Brereton, T.
Butterfly Conservation
NERC EDS Environmental Information Data Centre
https://ror.org/04xw4m193
2019-07-11
en
https://catalogue.ceh.ac.uk/id/ddcd1fa7-27d8-4082-93bd-a550c98208cf
https://data-package.ceh.ac.uk/sd/ddcd1fa7-27d8-4082-93bd-a550c98208cf.zip
text/csv Comma-separated values (CSV)
This resource is made available under the terms of the Open Government Licence
This dataset provides linear trends, over varying time periods, for the UK Butterfly Monitoring Scheme (UKBMS) 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 2017), for the last 20 years, and for the last decade. In addition a trend class, based on slope direction and its significance, and a percentage change for that time period are provided to describe the statistical trends. These trend data are provided for 59 UK butterfly species. Trends across different time series allow us to determine the long and short-term trends for individual species. This 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.
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.
-8.648
1.768
48.718
60.861