Effect of provision of supplementary food during winter and spring on the number of bird species using gardens in Europe
Published source details
Thompson P.S., Greenwood J.J.D. & Greenaway K. (1993) Birds in European gardens in the winter and spring of 1988-89. Bird Study, 40, 120-134
Published source details Thompson P.S., Greenwood J.J.D. & Greenaway K. (1993) Birds in European gardens in the winter and spring of 1988-89. Bird Study, 40, 120-134
This study is summarised as evidence for the following.
Provide supplementary foodAction Link
Provide supplementary food
A replicated controlled study of 440 gardens across 14 countries in Western Europe (excluding the UK) from October 1988 until May 1989 (Thompson et al. 1993) found that 264 gardens frequently provided with supplementary food were visited by an average of 21 species of birds, compared with 22 species for 40 moderately-fed gardens and 21 species for 116 infrequently-fed gardens. Differences were not significant. There was considerable variation across the study area, and feeding frequency appeared to affect the number of species visiting gardens in France and Switzerland, with 17.5 species visiting four infrequently-fed gardens, 13.3 species visiting four moderately-fed gardens and 20.7 species visiting 104 frequently-fed gardens. There was a similar, weaker effect for West Germany, the Netherlands and Belgium. Frequently-fed gardens were provided with food in more than two-thirds of the weeks studied, moderately-fed ones were provided with food for between one and two thirds of the weeks and infrequently-fed ones were provided with food in fewer than one third of the weeks studied.