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Table 2 Polynomial regressions of species richness patterns along the elevational gradient

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

Regressions Total species Large-ranged species Small-ranged species
First-order r2 0.46 0.157 0.767*
AIC 75.799 75.548 61.308
Second-order r2 0.956* 0.958* 0.858*
AIC 68.654 60.861 66.666
Third-order r2 0.99* 0.963* 0.944*
AIC 79.421 78.623 77.91
  1. Numbers in italics indicate the best regression model selected by lowest AIC value
  2. *Significant at p < 0.01