Table 2.
Detour-completion latencies of Portia africana (time elapsing between beginning of trial and reaching top of Viewing Tower; Stages 1–7: see the text). Comparison of control trials (number of prey did not change during trial; Scene 1) with experimental trials (number of prey changed during trial; Scene 2). For each experiment, n for control trials is indicated. For experimental trials, n always 40. All prey were of medium size (see the text). Adjusted alpha for Bonferroni corrections was always 0.01. All comparisons NS.
| experiment | number of prey | Scene 1 | Scene 2 | n for Control | Mann–Whitney U-test |
|---|---|---|---|---|---|
| 8a | 1 versus 2 | 1 prey facing right | 2 prey facing each other | 60 | Z = 0.32, p = 0.747 |
| 8b | 2 versus 1 | 2 prey facing each other | 1 prey facing right | 60 | Z = 1.57, p = 0.117 |
| 9a | 1 versus 3 | 1 prey facing right | above: 2 prey facing each other; below: 1 prey facing right | 60 | Z = 0.44, p = 0.661 |
| 9b | 3 versus 1 | above: 2 prey facing each other; below: 1 prey facing right | 1 prey facing right | 60 | Z = 1.04, p = 0.299 |
| 10a | 1 versus 4 | 1 prey facing right | 2 rows of 2 prey facing each other | 60 | Z = 0.45, p = 0.653 |
| 10b | 4 versus 1 | 2 rows of 2 prey facing each other | 1 prey facing right | 60 | Z = 0.61, p = 0.541 |
| 11a | 2 versus 3 | 2 prey facing each other | 2 prey facing right, 1 prey facing left | 60 | Z = 1.01, p = 0.312 |
| 11b | 3 versus 2 | 2 prey facing right, 1 prey facing left | 2 prey facing each other | 40 | Z = 1.02, p = 0.308 |
| 12a | 2 versus 4 | 2 prey facing each other | 2 rows of 2 prey facing each other | 60 | Z = 1.07, p = 0.284 |
| 12b | 4 versus 2 | 2 rows of 2 prey facing each other | 2 prey facing each other | 60 | Z = 0.33, p = 0.739 |
| 13a | 2 versus 6 | 2 prey facing each other | 3 rows of 2 prey facing each other | 60 | Z = 1.34, p = 0.179 |
| 13b | 6 versus 2 | 3 rows of 2 prey facing each other | 2 prey facing each other | 60 | Z = 0.49, p = 0.621 |
| 14a | 3 versus 4 | above: 2 prey facing each other; below: 1 prey facing right | 2 rows of 2 prey facing each other | 60 | Z = 0.78, p = 0.437 |
| 14b | 4 versus 3 | 2 rows of 2 prey facing each other | above: 2 prey facing each other; below: 1 prey facing right | 60 | Z = 0.32, p = 0.752 |
| 15a | 3 versus 6 | above: 2 prey facing each other; below: 1 prey facing right | 3 rows of 2 prey facing each other | 60 | Z = 1.14, p = 0.252 |
| 15b | 6 versus 3 | 3 rows of 2 prey facing each other | above: 2 prey facing each other; below: 1 prey facing right | 60 | Z = 0.96, p = 0.337 |