2 Issues Of Wetland Bird Survey - Wildfowl And Wader Counts 2007-2010
Merchant: Oxfam
Merchant's Category: Media> Books
"WeBS surveyors monitor the UK's internationally important non-breeding waterbirds. Following a tradition begun in 1947, wetland sites are counted once per month, providing data for population and trends in abundance and distribution. The network of sites legally protected for their importance to wintering waterbirds depends fundamentally on the WeBS counts. "Waterbirds" includes wildfowl (ducks, geese and swans), waders, rails, divers, grebes, cormorants and herons. Gulls and terns are optionally included. In a typical year over 220 waterbird species, races or populations are counted in WeBS, including non-native, feral and vagrant species. National trends are produced for the most numerous 110 of these" (from BTO website). These items are the two surveys 2007-2008 & 2009-2010. Both in very good condition.
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