Table 4.
ANCOVA for canal diameter and neuromast size in the SO and MD canals combined in Tramitichromis and Aulonocara
| N | R 2 | F | d.f. | P -value | |
|---|---|---|---|---|---|
|
Canal diameter (
Tramitichromis
) |
175 |
0.67 |
|
|
|
| SL |
|
|
348.0619 |
1, 171 |
<.0001 |
| Canal |
|
|
5.0408 |
1, 171 |
0.026 |
| SL x Canal |
|
|
0.3324 |
1, 171 |
0.5650 |
|
Canal diameter (
Aulonocara
) |
183 |
0.77 |
|
|
|
| SL |
|
|
582.8945 |
1, 179 |
<.0001 |
| Canal |
|
|
5.708 |
1, 179 |
0.0179 |
| SL x Canal |
|
|
3.1312 |
1, 179 |
0.0785 |
| |
N |
R
2
|
F |
d.f. |
P
-value |
|
Neuromast length (
Tramitichromis
) |
180 |
0.74 |
|
|
|
| SL |
|
|
338.8333 |
1, 176 |
<.0001 |
| Canal |
|
|
149.0871 |
1, 176 |
<.0001 |
| SL x Canal |
|
|
0.3759 |
1, 176 |
0.5406 |
|
Neuromast length (
Aulonocara
) |
209 |
0.73 |
|
|
|
| SL |
|
|
487.6754 |
1, 205 |
<.0001 |
| Canal |
|
|
54.3751 |
1, 205 |
<.0001 |
| SL x Canal |
|
|
2.4841 |
1, 205 |
0.1165 |
| |
N |
R
2
|
F |
d.f. |
P
-value |
|
Neuromast width (
Tramitichromis
) |
180 |
0.89 |
|
|
|
| SL |
|
|
1362.844 |
1, 176 |
<.0001 |
| Canal |
|
|
76.2438 |
1, 176 |
<.0001 |
| SL x Canal |
|
|
0.2324 |
1, 176 |
0.6304 |
|
Neuromast width (
Aulonocara
) |
209 |
0.88 |
|
|
|
| SL |
|
|
1441.915 |
1, 205 |
<.0001 |
| Canal |
|
|
16.9214 |
1, 205 |
<.0001 |
| SL x Canal | 0.4012 | 1, 205 | 0.5272 |
Analysis was carried out for supraorbital (SO) and mandibular (MD) canals combined in Tramitichromis and in Aulonocara. SL = Standard length (fish size) in mm. All data were normally distributed. Significance = P <0.05. The interaction terms in these ANCOVAs were significant, so the Johnson-Neyman technique was not used. See Figure 12 and Table 2 for ANOVA results and individual regressions.