The Constant Effort Sites (CES) scheme is the first national standardised ringing programme within the BTO Bird 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 approximately 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 24 species of common songbird.
The Partners
The Constant Effort Sites Scheme is supported by a partnership between the BTO and the JNCC on behalf of the statutory nature conservation bodies (Natural England, Natural Resources Wales, NatureScot and the Department of Agriculture, Environment and Rural Affairs, Northern Ireland).
It is part of the BTO Ringing Scheme which is also funded by the BTO/JNCC Partnership, The National Parks and Wildlife Service (Ireland) and the ringers themselves. The BTO's contribution to the Ringing Scheme is supported by funding from gifts in Wills, for which we are extremely grateful.