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Improving the value of field margins as foraging habitat for farmland birds
Article first published online: 9 FEB 2009
DOI: 10.1111/j.1365-2664.2009.01613.x
© 2009 The Authors. Journal compilation © 2009 British Ecological Society
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How to Cite
Douglas, D. J. T., Vickery, J. A. and Benton, T. G. (2009), Improving the value of field margins as foraging habitat for farmland birds. Journal of Applied Ecology, 46: 353–362. doi: 10.1111/j.1365-2664.2009.01613.x
Publication History
- Issue published online: 3 MAR 2009
- Article first published online: 9 FEB 2009
- Received 12 August 2008; accepted 29 December 2008Handling Editor: Jeremy Wilson
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Keywords:
- accessibility;
- agri-environment;
- food availability;
- habitat management;
- invertebrates;
- swards;
- vegetation structure;
- yellowhammer
Summary
- 1Uncropped field margins are important foraging habitats on farmland for many declining bird species and are a key component of Agri-Environment Schemes across Europe. Maximizing the value of foraging habitats requires detailed knowledge of the factors influencing habitat selection and food availability.
- 2We firstly conducted an observational study of foraging habitat selection by breeding yellowhammers Emberiza citrinella L. on lowland mixed farmland, in relation to underlying invertebrate and vegetation characteristics.
- 3There was a clear seasonal shift in the relative use of field margins and cereal crops. Margins were used less than crops in late summer, despite supporting higher invertebrate abundance relative to cereals. Seasonal increases in vegetation height were most marked in margins, suggesting the seasonal decline in margin use may reflect reduced food accessibility.
- 4In the second phase of the study, field margins were cut experimentally to create short, open patches within taller margin swards. The use of cut patches by foraging yellowhammers increased significantly between early and late summer, and patches were used more frequently with increasing height of adjacent uncut margin. These findings strongly support the theory that tall vegetation reduces margin accessibility in late summer.
- 5Synthesis and applications. Provision of invertebrate-rich field margins is a core component of Agri-Environment Schemes, but current prescriptions may result in them having limited value in late summer. More effective management, such as more frequent cutting, may be required to maximize the benefits for foraging birds by creating short, open vegetation patches. Measures to increase accessibility to invertebrates on farmland are likely to benefit a range of bird species across a variety of crop types.