Farmland Birds and Arable Farming, a Meta-Analysis

  • J. C. Wilcox
  • A. Barbottin
  • D. Durant
  • M. Tichit
  • D. Makowski
Part of the Sustainable Agriculture Reviews book series (SARV, volume 13)


Declines in farmland bird populations have been principally attributed to the intensification of agriculture. In response, agri-environmental schemes and organic farming have been introduced with the aim of making farmland better able to support wildlife populations. These “bird-friendly” agricultural practices include using more diverse crop rotations, stopping the use of pesticides, and creating more heterogeneous landscapes and are expected to create more food resources and nesting habitats for birds. Many studies have been published that evaluate the success or failure of agricultural practices to increase bird abundance. While many studies have found that most organic farming practices are beneficial to birds, other studies have found that some organic farming practices, such as using increased tillage passes, are not beneficial to birds. We conducted a search of the literature and used a meta-analysis approach to analyze the relationship between farming practices and bird populations. We first tested whether organic agriculture is more favorable to farmland birds of Europe and North America compared to conventional agriculture. We used data from 16 experiments and six publications that fulfilled fixed criteria for inclusion in the meta-analysis. We found that organic agriculture had a global positive effect on bird abundance compared to conventional agriculture. However, this effect was significant in only five out of the 16 site-year combinations tested. We also found that the effects varied with the bird species. Ten out of the thirty six species tested show a significant higher abundance value in organic agriculture. When the ratio was significantly different from zero, the abundance was 1.5–18 times higher in organic systems in comparison to conventional systems.

We also tested the effect of crop type on the territory abundance of the most studied species in the literature, the skylark (Alauda arvensis). Using data from six publications, we found two-times more skylark territories in set-aside and legume fields during the breeding season than in other crop types. One of the problems we encountered in our meta-analysis was that many different bird metrics were used in the studies, and these data were often reported without standard deviations or other measures of variability. We describe problems encountered with the data found in the literature and provide recommendations to prevent these problems.


Agriculture Organic farming Conventional farming Bird abundance Skylark Meta-analysis 


  1. Akaike H (1974) A new look at statistical model identification. IEEE Trans Autom Control 19:716–722CrossRefGoogle Scholar
  2. Arnqvist G, Wooster D (1995) Meta-analysis: synthesizing research findings in ecology and evolution. Trends Ecol Evol 10:236–240. doi:10.1016/s0169-5347(00)89073-4 PubMedCrossRefGoogle Scholar
  3. Beecher NA, Johnson RJ, Brandle JR, Case RM, Young LJ (2002) Agroecology of birds in organic and nonorganic farmland. Conserv Biol 16:1620–1631CrossRefGoogle Scholar
  4. Belfrage K, Bjorklund J, Salomonsson L (2005) The effects of farm size and organic farming on diversity of birds, pollinators, and plants in a Swedish landscape. Ambio 34:582–588. doi:10.1579/0044-7447-34.8.582 PubMedGoogle Scholar
  5. Bengtsson J, Ahnstrom J, Weibull AC (2005) The effects of organic agriculture on biodiversity and abundance: a meta-analysis. J Appl Ecol 42:261–269. doi:10.1111/j.1365-2664.2005.01005.x CrossRefGoogle Scholar
  6. Benton TG, Vickery JA, Wilson JD (2003) Farmland biodiversity: is habitat heterogeneity the key? Trends Ecol Evol 18:182–188. doi:10.1016/s0169-5347(03)00011-9 CrossRefGoogle Scholar
  7. Boatman ND, Brickle NW, Hart JD, Milsom TP, Morris AJ, Murray AWA, Murray KA, Robertson PA (2004) Evidence for the indirect effects of pesticides on farmland birds. Ibis 146:131–143. doi:10.1111/j.1474-919X.2004.00347.x CrossRefGoogle Scholar
  8. Bracken F, Bolger T (2006) Effects of set-aside management on birds breeding in lowland Ireland. Agric Ecosyst Environ 117:178–184. doi:10.1016/j.agee.2006.03.032 CrossRefGoogle Scholar
  9. Bradbury RB, Kyrkos A, Morris AJ, Clark SC, Perkins AJ, Wilson JD (2000) Habitat associations and breeding success of yellowhammers on lowland farmland. J Appl Ecol 37:789–805CrossRefGoogle Scholar
  10. Bradbury RB, Browne SJ, Stevens DK, Aebischer NJ (2004) Five-year evaluation of the impact of the arable stewardship pilot scheme on birds. Ibis 146:171–180CrossRefGoogle Scholar
  11. Bro E, Mayot P, Corda E, Reitz F (2004) Impact of habitat management on grey partridge populations: assessing wildlife cover using a multisite BACI experiment. J Appl Ecol 41:846–857CrossRefGoogle Scholar
  12. Browne S, Vickery J, Chamberlain D (2000) Densities and population estimates of breeding skylarks Alauda arvensis in Britain in 1997. Bird Stud 47:52–65CrossRefGoogle Scholar
  13. Chamberlain DE, Wilson JD, Fuller RJ (1999) A comparison of bird populations on organic and conventional farm systems in southern Britain. Biol Conserv 88:307–320CrossRefGoogle Scholar
  14. Chamberlain DE, Joys A, Johnson PJ, Norton L, Feber RE, Fuller RJ (2010) Does organic farming benefit farmland birds in winter? Biol Lett 6:82–84. doi:10.1098/rsbl.2009.0643 PubMedCrossRefGoogle Scholar
  15. Donald PF, Sanderson FJ, Burfield IJ, van Bommel FPJ (2006) Further evidence of continent-wide impacts of agricultural intensification on European farmland birds, 1990–2000. Agric Ecosyst Environ 116:189–196. doi:10.1016/j.agee.2006.02.007 CrossRefGoogle Scholar
  16. Eraud C, Boutin JM (2002) Density and productivity of breeding Skylarks Alauda arvensis in relation to crop type on agricultural lands in western France. Bird Stud 49:287–296CrossRefGoogle Scholar
  17. Eraud C, Corda E (2004) Nocturnal field use by wintering skylark Alauda arvensis on intensive farmlands. Rev Ecol-Terre Vie 59:581–589Google Scholar
  18. Field RH, Benke S, Badonyi K, Bradbury RB (2007) Influence of conservation tillage on winter bird use of arable fields in Hungary. Agric Ecosyst Environ 120:399–404. doi:10.1016/j.agee.2006.10.014 CrossRefGoogle Scholar
  19. Filippi-Codaccioni O, Clobert J, Juillard R (2009) Effects of organic and soil conservation management on specialist bird species. Agric Ecosyst Environ 129:140–143. doi:10.1016/j.agee.2008.08.004 CrossRefGoogle Scholar
  20. Freemark KE, Kirk DA (2001) Birds on organic and conventional farms in Ontario: partitioning effects of habitat and practices on species composition and abundance. Biol Conserv 101:337–350CrossRefGoogle Scholar
  21. Fuller RJ, Norton LR, Feber RE, Johnson PJ, Chamberlain DE, Joys AC, Mathews F, Stuart RC, Townsend MC, Manley WJ, Wolfe MS, Macdonald DW, Firbank LG (2005) Benefits of organic farming to biodiversity vary among taxa. Biol Lett 1:431–434. doi:10.1098/rsbl.2005.0357 PubMedCrossRefGoogle Scholar
  22. Gillings S, Newson SE, Noble DG, Vickery JA (2005) Winter availability of cereal stubbles attracts declining farmland birds and positively influences breeding population trends. Proc R Soc B-Biol Sci 272:733–739. doi:10.1098/rspb.2004.3010 CrossRefGoogle Scholar
  23. Gurevitch J, Hedges LV (1999) Statistical issues in ecological meta-analyses. Ecology 80:1142–1149. doi:10.2307/177061 CrossRefGoogle Scholar
  24. Hedges LV, Gurevitch J, Curtis PS (1999) The meta-analysis of response ratios in experimental ecology. Ecology 80:1150–1156. doi:10.2307/177062 CrossRefGoogle Scholar
  25. Hole DG, Perkins AJ, Wilson JD, Alexander IH, Grice F, Evans AD (2005) Does organic farming benefit biodiversity? Biol Conserv 122:113–130. doi:10.1016/j.biocon.2004.07.018 CrossRefGoogle Scholar
  26. Kleijn D, Sutherland WJ (2003) How effective are European agri-environment schemes in conserving and promoting biodiversity? J Appl Ecol 40:947–969. doi:10.1111/j.1365-2664.2003.00868.x CrossRefGoogle Scholar
  27. Kleijn D, Baquero RA, Clough Y, Diaz M, De Esteban J, Fernandez F, Gabriel D, Herzog F, Holzschuh A, Johl R, Knop E, Kruess A, Marshall EJP, Steffan-Dewenter I, Tscharntke T, Verhulst J, West TM, Yela JL (2006) Mixed biodiversity benefits of agri-environment schemes in five European countries. Ecol Lett 9:243–254. doi:10.1111/j.1461-0248.2005.00869.x PubMedCrossRefGoogle Scholar
  28. Kragten S, de Snoo GR (2007) Nest success of Lapwings Vanellus Vanellus on organic and conventional arable farms in the Netherlands. Ibis 149:742–749CrossRefGoogle Scholar
  29. Kragten S, de Snoo GR (2008) Field-breeding birds on organic and conventional arable farms in the Netherlands. Agric Ecosyst Environ 126:270–274. doi:10.1016/j.agee.2008.02.006 CrossRefGoogle Scholar
  30. Kragten S, Trimbos KB, de Snoo GR (2008) Breeding skylarks (Alauda arvensis) on organic and conventional arable farms in the Netherlands. Agric Ecosyst Environ 126:163–167. doi:10.1016/j.agee.2008.01.021 CrossRefGoogle Scholar
  31. McKenzie AJ, Whittingham MJ (2009) Why are birds more abundant on organic farms? J Food Agric Environ 7:807–814Google Scholar
  32. Newton I (2004) The recent declines of farmland bird populations in Britain: an appraisal of causal factors and conservation actions. Ibis 146:579–600. doi:10.1111/j.1474-919X.2004.00375.x CrossRefGoogle Scholar
  33. Norton L, Johnson P, Joys A, Stuart R, Chamberlain D, Feber R, Firbank L, Manley W, Wolfe M, Hart B, Mathews F, MacDonald D, Fuller RJ (2009) Consequences of organic and non-organic farming practices for field, farm and landscape complexity. Agric Ecosyst Environ 129:221–227. doi:10.1016/j.agee.2008.09.002 CrossRefGoogle Scholar
  34. Peach WJ, Lovett LJ, Wotton SR, Jeffs C (2001) Countryside stewardship delivers cirl buntings (Emberiza cirlus) in Devon, UK. Biol Conserv 101:361–373. doi:10.1016/s0006-3207(01)00083-0 CrossRefGoogle Scholar
  35. Piha M, Tiainen J, Holopainen J, Vepsalainen V (2007) Effects of land-use and landscape characteristics on avain diversity and abundance in a boreal agricultural landscape with organic and conventional farms. Biol Conserv 140:50–61. doi:10.1016/j.biocon.2007.07.021 CrossRefGoogle Scholar
  36. R Development Core Team (2011) R: a language and environment for statistical computing, Version 2.12.2 R Foundation for Statistical Computing, Vienna, AustriaGoogle Scholar
  37. Rands MRW (1986) The survival of gamebird (Galliformes) chicks in relation to pesticide use on cereals. Ibis 128:57–64CrossRefGoogle Scholar
  38. Robinson RA, Sutherland WJ (2002) Post-war changes in arable farming and biodiversity in Great Britain. J Appl Ecol 39:157–176. doi:10.1046/j.1365-2664.2002.00695.x CrossRefGoogle Scholar
  39. Roth T, Amrhein V, Peter B, Weber D (2008) A Swiss agri-environment scheme effectively enhances species richness for some taxa over time. Agric Ecosyst Environ 125:167–172. doi:10.1016/j.agee.2007.12.012 CrossRefGoogle Scholar
  40. Smith HG, Danhardt J, Lindstrom A, Rundlof M (2010) Consequences of organic farming and landscape heterogeneity for species richness and abundance of farmland birds. Oecologia 162:1071–1079. doi:10.1007/s00442-010-1588-2 PubMedCrossRefGoogle Scholar
  41. Van Buskirk J, Willi Y (2004) Enhancement of farmland biodiversity within set-aside land. Conserv Biol 18:987–994CrossRefGoogle Scholar
  42. Vickery JA, Bradbury RB, Henderson IG, Eaton MA, Grice PV (2004) The role of agri-environment schemes and farm management practices in reversing the decline of farmland birds in England. Biol Conserv 119:19–39. doi:10.1016/j.biocon.2003.06.004 CrossRefGoogle Scholar
  43. Wilson JD, Taylor R, Muirhead LB (1996) Field use by farmland birds in winter: an analysis of field type preferences using resampling methods. Bird Stud 43:320–332CrossRefGoogle Scholar
  44. Wilson JD, Evans J, Browne SJ, King JR (1997) Territory distribution and breeding success of skylarks Alauda arvensis on organic and intensive farmland in southern England. J Appl Ecol 34:1462–1478. doi:10.2307/2405262 CrossRefGoogle Scholar
  45. Wilson JD, Morris AJ, Arroyo BE, Clark SC, Bradbury RB (1999) A review of the abundance and diversity of invertebrate and plant foods of granivorous birds in northern Europe in relation to agricultural change. Agric Ecosyst Environ 75:13–30. doi:10.1016/s0167-8809(99)00064-x CrossRefGoogle Scholar
  46. Wolnicki K, Lesinski G, Rembialkowska E (2009) Birds inhabiting organic and conventional farms in central Poland. Acta Zool Crac Ser A-Vertebr 52A:1–10Google Scholar

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • J. C. Wilcox
    • 1
    • 2
    • 3
  • A. Barbottin
    • 1
    • 2
  • D. Durant
    • 4
  • M. Tichit
    • 1
    • 2
  • D. Makowski
    • 3
    • 5
  1. 1.INRA, UMR 1048 SAD-APTThiverval GrignonFrance
  2. 2.AgroParisTech, INRA, UMR 1048 SAD-APTParisFrance
  3. 3.INRA, UMR 211 AgronomieThiverval GrignonFrance
  4. 4.INRA, UE 57ParisFrance
  5. 5.AgroParisTech, UMR 211 AgronomieThiverval GrignonFrance

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