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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 2012), 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 is enables us to focus conservation and research and also to assess species responses to conservation already in place. The Centre for Ecology & Hydrology (CEH) and Butterfly Conservation (BC) are responsible for the calculation and interpretation of this trend datasets. The collection of the underlying UKBMS data is reliant on a large volunteer community. The UK Butterfly Monitoring Scheme is funded by a consortium of organisations led by the Joint Nature Conservation Committee (JNCC). This dataset is updated annually and a more recent version of the UKBMS species trends (2013) is now available.","distributionFormats":[{"name":"Comma-separated values (CSV)","type":"text/csv","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","role":"distributor","email":"ukbms@ceh.ac.uk"}],"id":"5afbbd36-2c63-4aa1-8177-695bed98d7a9","incomingCitationCount":2,"incomingCitations":[{"description":"Harrison, K.A., Wright, D.G., & Trembath, P. (2016). Implementation of a workflow for publishing citeable environmental data: successes, challenges and opportunities from a data centre perspective. 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Biological Journal of the Linnean Society, 115(3), 636–646.","url":"https://doi.org/10.1111/bij.12527"}],"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/5afbbd36-2c63-4aa1-8177-695bed98d7a9.zip","name":"Documents","description":"Documents available to assist with re-use of this dataset.","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Species Distribution","uri":"http://inspire.ec.europa.eu/theme/sd"}],"keywordsOther":[{"value":"butterfly","uri":"http://www.eionet.europa.eu/gemet/concept/1091"},{"value":"lepidopteran","uri":"http://www.eionet.europa.eu/gemet/concept/4777"},{"value":"Biodiversity","uri":"http://onto.nerc.ac.uk/CEHMD/topic/2"}],"keywordsPlace":[{"value":"United Kingdom","uri":"http://sws.geonames.org/2635167"},{"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"}],"licences":[{"value":"Licence terms and conditions apply ","code":"license","uri":"https://eidc.ac.uk/licences/ukbms-click-through/plain"}],"lineage":"Trends are calculated by performing a linear regression on the annual Collated Indices for each species. Collated indices are calculated from UKBMS data using a log-linear model incorporating individual site indices from all monitored sites across the UK for a given species in a given year. 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 it was recorded on five or more sites, the starting year for the series is later than 1976 for a number of rarer species.","metadataDate":"2026-06-27T13:59:01","notGEMINI":false,"onlineResources":[{"url":"https://data-package.ceh.ac.uk/sd/5afbbd36-2c63-4aa1-8177-695bed98d7a9.zip","name":"Documents","description":"Documents available to assist with re-use of this dataset.","function":"information","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/data/5afbbd36-2c63-4aa1-8177-695bed98d7a9","name":"Download the data","description":"Download a copy of this data","function":"download","type":"OTHER"}],"pointsOfContact":[{"displayName":"UKBMS","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire","postalCode":"OX10 8BB","country":"United Kingdom"},"fullName":"UKBMS","pointOfContact":"UK Centre for Ecology & Hydrology"},{"organisationName":"Butterfly Conservation","organisationIdentifier":"https://ror.org/05jg03a59","role":"pointOfContact","email":"info@butterfly-conservation.org","pointOfContact":"Butterfly Conservation"}],"publicationDate":"2013-05-01T00:00:00.000Z","publishers":[{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"relationships":[{"relation":"http://purl.org/dc/terms/isPartOf","target":"36f0209a-cbef-43a5-892f-332a214f330b"}],"resourceIdentifiers":[{"code":"1368011698524","codeSpace":"CEH:EIDC:"},{"code":"https://catalogue.ceh.ac.uk/id/5afbbd36-2c63-4aa1-8177-695bed98d7a9"},{"code":"10.5285/5afbbd36-2c63-4aa1-8177-695bed98d7a9","codeSpace":"doi"}],"resourceMaintenance":[{"frequencyOfUpdate":"annually","note":"Main updates occur annually at the end of the year following data collection and collation at Butterfly Conservation."}],"resourceType":{"value":"dataset"},"responsibleParties":[{"displayName":"UKBMS","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh Gifford","city":"Wallingford","administrativeArea":"Oxfordshire","postalCode":"OX10 8BB","country":"United Kingdom"},"fullName":"UKBMS","pointOfContact":"UK Centre for Ecology & Hydrology"},{"organisationName":"Butterfly Conservation","organisationIdentifier":"https://ror.org/05jg03a59","role":"pointOfContact","email":"info@butterfly-conservation.org","pointOfContact":"Butterfly Conservation"},{"organisationName":"UK Butterfly Monitoring Scheme","role":"resourceProvider","email":"ukbms@ceh.ac.uk"},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"},{"familyName":"Botham","givenName":"M.","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"enquiries@ceh.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-5276-1405","fullName":"Botham, M."},{"familyName":"Roy","givenName":"D.","organisationName":"Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"author","email":"enquiries@ceh.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-5147-0331","fullName":"Roy, D."},{"familyName":"Brereton","givenName":"T.","organisationName":"Butterfly Conservation","organisationIdentifier":"https://ror.org/05jg03a59","role":"author","email":"info@butterfly-conservation.org","fullName":"Brereton, T."},{"familyName":"Middlebrook","givenName":"I.","organisationName":"Butterfly Conservation","organisationIdentifier":"https://ror.org/05jg03a59","role":"author","email":"info@butterfly-conservation.org","fullName":"Middlebrook, I."},{"familyName":"Randle","givenName":"Z.","organisationName":"Butterfly Conservation","organisationIdentifier":"https://ror.org/05jg03a59","role":"author","email":"info@butterfly-conservation.org","fullName":"Randle, Z."},{"organisationName":"NERC Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"}],"securityConstraints":["unclassified"],"spatialReferenceSystems":[{"code":"http://www.opengis.net/def/crs/EPSG/0/27700","title":"OSGB 1936 / British National Grid"}],"spatialRepresentationTypes":["textTable"],"supplemental":[{"name":"UKBMS website","description":"This is a web page which provides data for each butterfly species at each monitored site. 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