Trends of pervasive and wintering water birds.
Data available from: 1975
Frequency: yearly
Changes to the previous version:
Of the next 6 fresh Rjkswaters, the counting data are now also
included in the calculation of national indexes and trends:
Naardermeer, Nieuwkoopse Plassen, Boezems van Kinderdijk, Abtkolk
and Putten, Zouwe Boezem and Swan Water.
The indexes and trends of the following bird species have also been calculated:
Dwarf goose, Geo-ordered Fuut, Big Canadian Goose, Big Eagle, Small
Silver heron, Crombek beach runner, Krooneend, Tiny diver, Lepelaar and
Strandplevier.
For the indexes, the base year 2000 is set to 100.
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