Table 3 Coefficients from the minimal adequate ordinary least-squares regression (OLS) and phylogenetic generalised least squares regression (PGLS) models for mean desiccation resistance, starvation resistance, lipid content, critical thermal minimum (CTmin) and critical thermal maximum (CTmax) of C. capitata populations.

From: Geographic variation and plasticity in climate stress resistance among southern African populations of Ceratitis capitata (Wiedemann) (Diptera: Tephritidae)

Effect

OLS

PGLS

Estimate

S.E.

t

P

AIC

Estimate

S.E.

t

P

AIC

λ

Desiccation

  (Intercept)

107.676

16.215

6.641

0.001

54.801

107.397

16.451

6.528

0.001

52.993

0.000

  GDD

−0.007

0.003

−2.647

0.038

 

−0.007

0.003

−2.584

0.042

  

Starvation

  (Intercept)

255.376

56.027

4.558

0.004

74.639

252.962

56.969

4.440

0.004

72.866

0.000

  GDD

−0.021

0.009

−2.411

0.052

 

−0.020

0.009

−2.317

0.060

  

Lipid content

  (Intercept)

1.114

0.848

1.314

0.280

−1.026

1.095

0.867

1.262

0.296

−2.873

0.000

  PET

−0.000

0.000

−1.121

0.344

 

−0.000

0.000

−1.112

0.347

  

  GDD

−0.000

0.000

−1.530

0.224

 

−0.000

0.000

−1.498

0.231

  

  Aridity

0.000

0.000

1.828

0.165

 

0.000

0.000

1.814

0.167

  

  Temp (sd)

0.000

0.000

1.411

0.253

 

0.000

0.000

1.418

0.251

  

CTmin

  (Intercept)

3.556

1.208

2.943

0.026

27.586

3.701

1.162

3.184

0.019

25.015

0.000

Temp (sd)

0.001

0.000

2.669

0.037

 

0.001

0.000

2.696

0.036

  

CTmax

  (Intercept)

42.573

1.070

39.778

 < 0.001

8.766

42.626

1.050

40.581

 < 0.001

6.528

0.000

  GDD

0.000

0.000

1.256

0.264

 

0.000

0.000

1.189

0.288

  

  Temp (sd)

−0.000

0.000

−2.927

0.033

 

−0.000

0.000

−2.962

0.031

  
  1. The minimal adequate least squares regression model was determined using step-wise deletion of least significant terms based on improvement of Akaike’s information criterion (AIC). Predictor variables in the full model were potential evapotranspiration seasonality [PET (sd)], growing degree-days with 0 °C base (GDD), aridity index, and temperature seasonality [Temp (sd)]. Phylogenetic correlation (on a scale of 0 to 1) is given by λ.
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