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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)
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