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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 2018), 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.\n\nThe 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.\n\nThis work was supported by the Natural Environment Research Council award number NE/R016429/1 as part of the UK-SCAPE programme delivering National Capability.","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"funding":[{"funderName":"Natural Environment Research Council","funderIdentifier":"https://ror.org/02b5d8509","awardTitle":"UK-SCaPE","awardNumber":"NE/R016429/1","awardURI":"https://gtr.ukri.org/projects?ref=NE/R016429/1","orcid":false,"ror":true}],"id":"ee4b440e-2604-40b9-bca7-19d6392bd9ea","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/ee4b440e-2604-40b9-bca7-19d6392bd9ea.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Species Distribution","uri":"http://inspire.ec.europa.eu/theme/sd"}],"keywordsOther":[{"value":"lepidopteran","uri":"http://www.eionet.europa.eu/gemet/concept/4777"},{"value":"butterfly","uri":"http://www.eionet.europa.eu/gemet/concept/1091"}],"keywordsPlace":[{"value":"England","uri":"http://sws.geonames.org/6269131"},{"value":"Scotland","uri":"http://sws.geonames.org/2638360"},{"value":"Wales","uri":"http://sws.geonames.org/2634895"},{"value":"Northern Ireland","uri":"http://sws.geonames.org/2641364"},{"value":"United Kingdom","uri":"http://sws.geonames.org/2635167"}],"keywordsProject":[{"value":"UK-SCAPE"}],"keywordsTheme":[{"value":"Biodiversity","uri":"http://onto.nerc.ac.uk/CEHMD/topic/2"}],"licences":[{"value":"This resource is available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/ogl-ukbms/plain"}],"lineage":"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.","metadataDate":"2026-06-29T17:23:08","notGEMINI":false,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/data/ee4b440e-2604-40b9-bca7-19d6392bd9ea","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/ee4b440e-2604-40b9-bca7-19d6392bd9ea.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"pointsOfContact":[{"familyName":"Botham","givenName":"Marc","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, 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