Table 3 Summary of the simple linear regression analysis on the ‘extended dataset’ using phylogenetic generalized least square (PGLS) model

‘Range + Mean’

data

λ = 0.966

λ = 0.805

λ = 0.902

λ = 0.901

λ = 0.964

λ = 0.961

λ = 0.963

R² = 0.36

df = 453

df = 407

df = 402

df = 371

df = 366

df = 404

df = 2, 249

t = −1.71

t = −3.21

t = −2.86

t = −2.84

t = −2.87

t = 1.74

ES: p < 0.01

p = 0.09

p < 0.01

p < 0.01

p < 0.01

p < 0.01

p = 0.08

Slope = 0.46

t = 8.06

CS: p < 0.01

Slope = 0.15

t = 10.24

‘Mean’ data

λ = 0.970

λ = 0.895

λ = 0.899

λ = 0.894

R² = 0.41

df = 255

df = 295

df = 291

df = 2, 196

R² = 0.02

t = −2.59

t = −2.84

ES: p < 0.01

ES: p = 0.05

p = 0.01

p < 0.01

Slope = 0.49

Slope=

t = 7.92

−0.15

CS: p < 0.01

t = −1.99

Slope = 0.16

t = 9.96