Breeding birds: scrub encroachment of marshes, bogs and swamps
On average, the number of pairs of breeding birds in marshes, bogs and swamps has remained constant, but there has been a change in the composition of the bird population.
Trends
On average, numbers of breeding pairs of birds in marshes, bogs and swamps in 1990 and 1950 are comparable. The species group remained more or less stable thereafter, although in the last three years there seems to have been a slight increase. The composition of the population of breeding birds has changed, however: since 1950 some of the birds of reed vegetation have declined, whereas certain other species have increased, particularly hedgerow birds The main reasons for the changes are scrub encroachment and the dwindling of fringes of reed.
