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Table 3 Simple ordinary least squares (OLS) regression analyses of interpolated species richness against seven factors for different species categories

From: Elevational patterns of bird species richness on the eastern slope of Mt. Gongga, Sichuan Province, China

Species categories Factors
LA EVI STR MDT IB SP MDE
Total species
r 2 0.42 0.577 0.254 0.286 0.596 0.123 0.494
r 2adj 0.324 0.507 0.13 0.168 0.529 − 0.023 0.41
p 0.082 0.029 − 0.203 0.172 0.025 0.394 0.052
Large-ranged species
r 2 0.222 0.213 0.036 0.053 0.37 < 0.001 0.797
r 2adj 0.092 0.08 − 0.125 − 0.104 0.265 − 0.167 0.763
p 0.239 0.25 − 0.655 0.582 0.11 0.949 0.003
Small-ranged species
r 2 0.51 0.925 0.624 0.632 0.65 0.558 0.1
r 2adj 0.427 0.912 0.562 0.571 0.59 0.484 − 0.05
p 0.047 < 0.001 − 0.02 0.018 0.016 − 0.033 0.448
  1. r 2adj is the adjusted r2 value for multiple regressions
  2. Negative relationships are indicated by “− ”
  3. LA land area, EVI enhanced vegetation index, STR seasonal temperature range, MDT mean daily temperature, IB invertebrate biomass, SP seasonal precipitation, MDE the mid-domain effect
  4. Numbers in italics indicate significant r2 values (p < 0.05)