《Table 3 Results of a weighted mixed-model meta-analysis assessing how the slope(z)of the power spec

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《A global consistent positive effect of urban green area size on bird richness》

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The Q test（Q），degrees of freedom（df），P values and the fail-safe numbers are shown a Biomes with only a single case study were excluded from the analysis b Test performed after excluding a case study with exceptional distance to rural areas

Of the 101 articles we found that analyzed bird communities in urban green areas，relevant information was found in 49 studies.These studies were published between 1976and 2015（mean=2004）.Of these 49 studies，44 were conducted solely in urban parks，four in urban parks and golf courses or cemeteries，and one study was conducted only in cemeteries.A total of 17 studies（35%）were from Europe，14（29%）from South America，nine（18%）from North America，seven（14%）from Asia and two（4%）from Oceania（Fig.2）.Of the 49 studies，the sampling methodology employed was classified as stringent in22（45%），intermediate in 17（35%），and lax in 10（20%）（Additional file 1:Table S1）.For 46 studies，we obtained data on the area and species richness of each green area in the study（see below）.