Expression of spots and blotches by plaice settled for 15 min on the three backgrounds
| . | . | Level of expression . | . | . | |
|---|---|---|---|---|---|
| Spots | |||||
| Background | 0 | 1 | 2 | 3 | |
| 1 | 0 | 12 | 0 | 0 | |
| 2 | 0 | 0 | 5 | 7 | |
| 3 | 0 | 1 | 9 | 2 | |
| Blotches | |||||
| Background | 0 | 1 | 2 | 3 | |
| 1 | 1 | 9 | 2 | 0 | |
| 2 | 2 | 1 | 6 | 3 | |
| 3 | 1 | 3 | 5 | 3 | |
| . | . | Level of expression . | . | . | |
|---|---|---|---|---|---|
| Spots | |||||
| Background | 0 | 1 | 2 | 3 | |
| 1 | 0 | 12 | 0 | 0 | |
| 2 | 0 | 0 | 5 | 7 | |
| 3 | 0 | 1 | 9 | 2 | |
| Blotches | |||||
| Background | 0 | 1 | 2 | 3 | |
| 1 | 1 | 9 | 2 | 0 | |
| 2 | 2 | 1 | 6 | 3 | |
| 3 | 1 | 3 | 5 | 3 | |
Each of the six fish was tested twice on each of the three backgrounds;values are the scores for each individual test. Given the balanced design we treated samples as independent using two-sided ϰ2, with Fisher's exact test where appropriate.
There are significant effects of the background. For spots comparing background 1 with combined data for backgrounds 2 and 3, at expression levels 0,1 vs 2,3: P<0.001. For spots comparing backgrounds 2 and 3 at expression levels 0-2 vs 3 P=0.09. For blotches comparing levels 1, 2, 3 separately and expression levels 0,1 vs 2,3: P=0.008.