Population estimates

This publication, from Wetlands International, sets the global standard in presenting estimates of the numbers and trends of waterbird populations throughout the world. Developed in support of the Ramsar Convention, and used for the African-Eurasian Migratory Waterbird Agreement (AEWA) under the Bonn Convention, it lists population estimates for biogeographical populations of waterbirds, along with 1% thresholds and population trend information. The compilation draws on many sources of data, including the International Waterbird Census (IWC), which itself draws on the Wetland Bird Survey (WeBS) for UK data.
The estimates and thresholds presented have been adopted for statutory use by JNCC and the Country Agencies. For ease of interpretation we provide a list of international populations and 1% thresholds for Great Britain and Ireland. 
JNCC supports the work of Wetlands International and supported the publication of the fourth edition of Waterbird Population Estimates.
UK and GB: the Avian Population Estimates Panel (APEP)
Population estimates are collated periodically in a single source document by the Avian Population Estimates Panel, which is a group of experts from key organisations that are involved in producing population estimates. The APEP list is used for statutory purposes and national 1% threshold values are derived from it according to rules agreed by the Statutory Conservation Agencies. 
APEP06 list (full published paper): published in British Birds 99 in January 2006, this is the most recent collation of national population estimates.  Link to British Birds report  


Trend information is published in a number of sources and can be accessed via the Surveillance & Montoring  pages of this website.