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Table 4 General linear mixed models on niche/diet preferences by the use of stable isotopic responses of δ15N and δ13C with predictor variables for the threespined stickleback in Lake Engervann. - denote non-reported values

From: Ongoing niche differentiation under high gene flow in a polymorphic brackish water threespine stickleback (Gasterosteus aculeatus) population

Test

Parameter

Estimate ± se

Df

F

P

Stable isotopic values of nitrogen (δ15N)

Intercept

9.380 ± 0.772

–

–

< 0.001

R2 = 0.21

Sampling area

0.238 ± 0.077

1

9.50

0.002

N = 236

Sampling date

−0.210 ± 0.078

1

7.31

0.007

P < 0.001

Sex

−0.086 ± 0.077

1

1.25

0.265

Df = 6

Lateral plate morph - CPM*

0.258 ± 0.135

1

2.37*

0.095*

 

Lateral plate morph - LPM*

−0.313 ± 0.149

1

–

–

 

Body length

0.470 ± 0.164

1

8.21

0.005

Stable isotopic values of carbon (δ13C)

Intercept

−20.86 ± 0.943

–

–

< 0.001

R2 = 0.20

Sampling area

0.193 ± 0.095

1

4.16

0.043

N = 236

Sampling date

−0.474 ± 0.095

1

24.97

< 0.001

P < 0.001

Sex

0.001 ± 0.094

1

0.00

0.988

Df = 6

Lateral plate morph - CPM#

−0.117 ± 0.165

1

1.45#

0.237#

 

Lateral plate morph - LPM#

− 0.105 ± 0.182

1

–

–

 

Body length

0.762 ± 0.201

1

14.45

< 0.001

  1. for * and # the presented F-values and P-values are only reported jointly for the three classes of the lateral plate morphs (CPM Completely plated, PPM Partially plated, LPM Lowplated) while parameter values reported separately for CPM and LPM