Table 1: Summary of population estimates from Waterbird Population Estimates 5 (Wetlands International 2012). Subspecies Season Population Name Start End Minimum Maximum Estimate 1% References Year Year (ind.) (ind.) Quality Threshold Non-breeding Europe/Europe North 1990 2000 700,000 Expert Opinion 8,400 BirdLife 2004b, N. a. arquata & West Africa Thorup 2006 Non-breeding Western Siberia/SW 1987 1991 25,000 100,000 Best 1000 Perennou 1994 N. a. orientalis et al. Asia E & S Africa Non-breeding S Asia 1987 1991 10,000 100,000 Best Guess 1000 Perennou 1994 N. a. orientalis et al. Non-breeding E & SE Asia 2008 2008 100,000 100,000 Expert Opinion 1000 Cao 2009 N. a. orientalis et al. Breeding Southeast Europe & 2009 2009 1 10,000 Best 100 Delany 2009 N. a. suschkini et al. South-west Asia
Table 1: Summary of population estimates from Waterbird Population Estimates 5 (Wetlands International 2012). Subspecies Season Population Name Start Year End Year Minimum (ind.) Maximum (ind.) Estimate Quality 1% Threshold References N. a. arquata Non-breeding Europe/Europe North & West Africa 1990 2000 700,000 Expert Opinion 8,400 BirdLife 2004b, Thorup 2006 N. a. orientalis Non-breeding Western Siberia/SW Asia E & S Africa 1987 1991 25,000 100,000 Best 1000 Perennou et al. 1994 N. a. orientalis Non-breeding S Asia 1987 1991 10,000 100,000 Best Guess 1000 Perennou et al. 1994 N. a. orientalis Non-breeding E & SE Asia 2008 2008 100,000 100,000 Expert Opinion 1000 Cao et al. 2009 N. a. suschkini Breeding Southeast Europe & South-west Asia 2009 2009 1 10,000 Best 100 Delany et al. 2009
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