Common in agricultural areas with abundant traditional farm buildings. Areas with dairy farming and mixed farming attract larger numbers, whereas large-scale arable land and areas with modern farms (often industrialised cattle-breeding) hold much lower densities. However, field methods used for this atlas are rather inaccurate to assess the abundance in this species. Data from a special Barn Swallow project point at a serious decline since the 1970s, mainly as a result of ongoing modernisation of farm buildings and increased hygienic demands put to farmers. Population size is poorly known, perhaps 100,000-200,000 bp.
Brink, B. van den
- SOVON Vogelonderzoek Nederland 2002. Atlas van de Nederlandse broedvogels 1998-2000. Nederlandse Fauna 5: 1-584. Nationaal Natuurhistorisch Museum Naturalis, KNNV Uitgeverij & European Invertebrate Survey-Nederland, Leiden.