Individual study: Mixed effects of re-wetting grasslands on wader populations in Denmark
Kahlert J., Clausen P. & Hounisen J. (2007) Response of breeding waders to agri-environmental schemes may be obscured by effects of existing hydrology and farming history. Journal of Ornithology, 148, 287-293
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Reduce management intensity on permanent grasslands (several interventions at once)
A replicated, controlled study in 1999-2001 and 2004-2005 in Jutland, Denmark (Kahlert et al. 2007), found that permanent grassland fields under an agri-environment scheme designed to increase water levels had significantly higher numbers of three species of wading bird (northern lapwing Vanellus vanellus, black-tailed godwit Limosa limosa, common redshank Tringa totanus) after the scheme was implemented (2004-2005), compared to numbers before the scheme (1999-2001). Eurasian oystercatchers Haematopus ostrolagus did not increase. Effects of the scheme varied between restored and permanent grasslands, and between wet and dry fields. The scheme involved promoting wet grasslands as well as reducing fertilizer inputs, grazing pressure and the period of mowing. A total of 615 fields were studied. The four species were surveyed twice during the breeding season (April-May), and the number of each species and their location recorded.