Cite this dataset as
Rennie, S.; Bater, J. ; Beaumont, D. ; Benham, S. ; Britt, C. ; Brooks, D. ; Brunt, A. ; Brunt, J. ; Corbett, S. ; Critchley, N. ; Donovan, N. ; Hargreaves, P. ; Howe, M. ; Lane, M. ; McMillan, S. ; Morecroft, M. ; Onley, D. ; Overall, R. ; Pallett, D. ; Schafer, S. ; Scott, T. ; Sherrin, L. ; Shortall, C. ; Smith, R. ; Smith, P. ; Taylor, M. ; Tyson, K. (2017). UK Environmental Change Network (ECN) common breeding birds data 1971-2007. NERC Environmental Information Data Centre. (Dataset). https://doi.org/10.5285/8582a02c-b28c-45d2-afa1-c1e85fba023d
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This dataset is made available under the terms of the Open Government Licence 
Comma-separated values (CSV)
These data are collected, using the British Trust for Ornithology (BTO)'s Common Bird Census methodology, at all of ECN's terrestrial sites using a standard protocol. Prior to deposit of the data in the EIDC, data are managed by the ECN Data Centre at CEH Lancaster according to defined protocols.
Verification steps include numeric range checks (i.e. checking if a value falls within a specified range), categorical checks (e.g. checking that a species code appears on the standard code list), formatting (i.e. that the dataset conforms to the specified data format) and logical integrity checks (i.e. checking the data make sense, e.g. that the dates in one dataset match those in a related dataset).
Appropriate range settings for ECN variables have been selected following discussion with specialists in each field. Where data fall outside these ranges, a cautious approach has been adopted towards discarding data on the principle that apparent errors may be valid outliers. Such values are discarded only if there is a clear explanation (e.g. an instrumentation error) and corrections are made where possible. If the reason is unclear, the values are stored, but are qualified using pre-defined quality codes or free-text descriptions. Data providers also use these codes or free text to describe factors affecting sampling outside their control, instrument damage or site management effects.
https://orcid.org/0000-0002-0027-0436