The Constant Effort Sites Scheme (CES)
The Constant Effort Sites (CES) scheme is the first national standardised ringing programme within the BTO Ringing Scheme and has been running since 1983. Ringers operate the same nets in the same locations over the same time period at regular intervals through the breeding season at 120 sites throughout Britain and Ireland.
The Scheme provides valuable trend information on abundance of adults and juveniles, productivity and also adult survival rates for 25 species of common songbird.
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2011 preliminary CES results
The CES preliminary report on the 2011 breeding season is now available. Records received so far this year have been analysed for 25 common breeding species and compared with data from previous years. See the report here.
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CES News May 2011 edition (2010 CES results)
Download a copy here.
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