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Status of Native Wintering Waders: 1974-2004
Percentage change since 1974-1978 R 7
| 1980-1984 | 1985-1989 | 1990-1994 | 1995-1999 | 2000-2004 |
|---|
Dunlin | -46 | -50 | -20 | -13 | -25 |
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Redshank | -44 | -35 | -28 | -29 | -23 |
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Knot | -35 | -37 | -23 | -3 | -16 |
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Sanderling | 377 | 258 | 130 | 190 | 255 |
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Black-tailed Godwit | 53 | 73 | 203 | 418 | 663 |
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During the autumn, winter and spring, Scotland's wetlands and shores support internationally-important populations of waders. Most waders are highly mobile and capable of responding rapidly to changes in the environment which might affect feeding or survival. For example, weather conditions may affect count data for a particular species, so short-term trends may therefore indicate a redistribution of populations rather than a decrease or increase.
The Wetland Bird Survey 8 provides the data to calculate reliable population indices on 11 out of 18 wader species wintering in Scotland. Comparing the mean populations during two five-year periods, 1974-1978 and 2000-2004, shows that six of the 11 species increased by at least 10% and four fell by at least 10%. The dunlin population decreased by 25% while the black-tailed godwit showed the largest rise in population, increasing by 663% over this period. This increase is probably related to warmer summer conditions at Icelandic breeding grounds favouring chick survival and breeding success.
The UK is bound by international laws and conventions to protect and conserve waders, and the wetlands on which they depend. These include the EC Birds Directive (79/409/ EEC and amendments), the EC Habitats Directive (92/43/ EEC), and the Ramsar Convention on Wetlands.
SOURCE: BRITISH TRUST FOR ORNITHOLOGY - WETLAND BIRD SURVEY DATA 8
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