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. 2001 Sep 11;98(20):11365–11370. doi: 10.1073/pnas.201398398

Figure 4.

Figure 4

The relationship between mean potential evapotranspiration (mm/year) and butterfly species richness based on 5° quadrats. Both variables are square root-transformed. The relationship, which is strongly positive at all spatial scales in this study, is always less significant than that between VGT land cover diversity and butterfly species richness.