Table 1 General linear models of mean pore area measurements for four cranial canals, testing for differences between genetically characterised subpopulations

Mean mandibular pore area (log₁₀)

Subpopulation

0.733

48.96

2

194

 < 0.001^***

L-B

0.008^**

Standard length (log₁₀)

1.810

241.77

1

194

 < 0.001^***

I-B

1.000

Sex

0.004

0.489

1

194

0.485

I-L

0.155

Gross lateral head morphology (PC1)

0.0001

0.0001

1

194

0.995

Gross ventral head morphology (PC1)

0.0001

0.0015

1

194

0.969

Mean preopercular pore area (log₁₀)

Subpopulation

1.346

107.20

2

194

 < 0.001^***

L-B

 < 0.001^***

Standard length (log₁₀)

1.683

268.17

1

194

 < 0.001^***

I-B

0.303

Sex

0.001

0.156

1

194

0.693

I-L

0.040^*

Gross lateral head morphology (PC1)

0.018

2.825

1

194

0.094

Gross ventral head morphology (PC1)

0.010

1.646

1

194

0.201

Mean infraorbital pore area (log₁₀)

Subpopulation

4.209

234.98

2

191

 < 0.001^***

L-B

 < 0.001^***

Standard length (log₁₀)

1.844

205.88

1

191

 < 0.001^***

I-B

 < 0.001^***

Sex

0.000

0.039

1

191

0.844

I-L

0.021^*

Gross lateral head morphology (PC1)

0.019

2.12

1

194

0.148

Gross ventral head morphology (PC1)

0.027

3.07

1

194

0.082

Mean otic pore area (log₁₀)

Subpopulation

1.238

70.36

2

194

 < 0.001^***

L-B

 < 0.001^***

Standard length (log₁₀)

1.74

198.22

1

194

 < 0.001^***

I-B

0.013^*

Sex

0.007

0.757

1

194

0.375

I-L

0.848

Gross lateral head morphology (PC1)

0.001

0.037

1

194

0.848

Gross ventral head morphology (PC1)

0.002

0.170

1

194

0.681