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Providing evidence to improve practice

Action: Leave refuges in fields during harvest Bird Conservation

Key messages

  • A replicated study in France found that fewer gamebirds came into contact with mowing machinery when refuges were left in fields than when they were not left.
  • A review from the UK found that Eurasian skylarks Alauda arvensis did not nest at higher densities in uncut refuges than in the rest of the fields.

 

Supporting evidence from individual studies

1 

A replicated study in 1996-7 in 62 hay fields in Bourgogne, France (Broyer 2003), found that contact between mowing machinery and unfledged common quail Coturnix coturnix and corncrake Crex crex was reduced by approximately 50% and 33% respectively, by leaving 10 m wide, uncut strips in the centre of fields. In addition, unmowed strips held the highest concentrations of corncrakes, quails and passerines (7.7 birds/ha, 3.8 birds/ha and 10.8 birds/ha respectively in 1996).

 

2 

A review of four experiments on the effects of agri-environment measures on livestock farms in the UK (Buckingham et al. 2010) found one trial from 2006 to 2008 demonstrating that uncut nesting refuges for skylarks Alauda arvensis in silage fields were not used more than other areas. Refuge plots of 1 ha were cut with raised mowing height in the first silage cut, then left uncut for the rest of the season. The plots were preferred for re-nesting for two weeks following the first cut, but subsequently did not have higher nest densities than other areas. Skylarks continually re-nest rather than re-nesting in a batch after each cut. After the second cut, safe areas were completely avoided by skylarks. This study formed part of a Defra-funded project (BD1454) for which no reference is given in the review.

 

Referenced papers

Please cite as:

Williams, D.R., Child, M.F., Dicks, L.V., Ockendon, N., Pople, R.G., Showler, D.A., Walsh, J.C., zu Ermgassen, E.K.H.J. & Sutherland, W.J. (2018) Bird Conservation. Pages 95-244 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2018. Open Book Publishers, Cambridge, UK.