Relative abundance maps

Relative abundance map

 

Maps showing the locations, and numbers, of birds counted as part of extensive bird surveys can provide useful information on bird distribution, and may highlight strongholds.  However, the utility of the maps is limited by the numbers of sites surveyed, which may be biased towards areas of higher coverage.

A project carried out in 2003 used BBS data and geostatistical methods to predict relative abundance at non-surveyed sites, and maps of 78 common and widespread breeding bird species were produced available here.  Kriging has been used here, which weights the surrounding counts at surveyed sites to derive a prediction for unsurveyed locations.

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