Table 1.
Results of pairwise olfactory choice experiments on field-collected juvenile A. percula, including the choices made between (a) water from reefs with and without islands, (b) water from different distances away from islands and (c) water with and without anemones and rainforest leaves. In addition, (d) shows the pairwise trials for laboratory-reared juveniles and their choices between water with and without anemones and leaves. Data are mean percentage of time spent in water flowing from the two sources ±s.e. Statistic tests are Χ2-tests on the number of trials where larvae exhibited a preference for one water source in the test chamber. n, sample size; p, probability of the data given the null hypothesis that there is no choice.
| pairwise test | choice 1, mean % time±s.e. | choice 2, mean % time±s.e. | Χ2 | n | p | ||
|---|---|---|---|---|---|---|---|
| (a) field experiment 1: reefs with and without islands | Tuare Is. | 99.6±0.04 | South Bay Reef | 0.4±0.04 | 28.0 | 28 | <0.001 |
| Kimbe Is. | 99.5±0.1 | May Reef | 0.5±0.1 | 22.0 | 22 | <0.001 | |
| (b) field experiment 2: distance from island | Tuare Is. beach | 98.0±0.1 | Tuare Is. offshore | 2.0±0.1 | 22.0 | 22 | <0.001 |
| Tuare Is. beach | 95.0±0.3 | Tuare Is. crest | 5.0±0.3 | 22.0 | 22 | <0.001 | |
| Tuare Is. crest | 55.0±0.6 | Tuare Is. offshore | 45.0±0.6 | 0.17 | 22 | 0.683 | |
| Kimbe Is. beach | 93.0±0.4 | Kimbe Is. offshore | 7.0±0.4 | 24.0 | 24 | <0.001 | |
| Kimbe Is. beach | 97.2±0.8 | Kimbe Is. crest | 7.3±0.6 | 20.2 | 24 | <0.001 | |
| Kimbe Is. crest | 57.0±0.8 | Kimbe Is. offshore | 43.0±0.8 | 0.0 | 24 | 1 | |
| (c) field experiment 3: response to anemones and leaves | anemone | 91.0±0.7 | no anemone | 9.0±0.7 | 18.2 | 22 | <0.001 |
| mixed leaves | 89.5±0.7 | no leaves | 10.5±0.7 | 20.2 | 24 | <0.005 | |
| leaves sp. 1 | 90.0±0.6 | no leaves | 10.0±0.7 | 20.0 | 20 | <0.001 | |
| leaves sp. 2 | 92.0±0.4 | no leaves | 8.0±0.4 | 20.0 | 20 | <0.001 | |
| leaves sp. 3 | 90.0±0.7 | no leaves | 10.0±0.7 | 16.2 | 20 | <0.001 | |
| leaves sp. 4 | 92.0±0.6 | no leaves | 8.0±0.6 | 20.0 | 20 | <0.001 | |
| leaves sp. 5 | 94.0±0.4 | no leaves | 6.0±0.4 | 20.0 | 20 | <0.001 | |
| (d) laboratory experiment: response of naive larvae to anemones and leaves | anemone | 98.0±0.2 | no anemone | 2.0±0.2 | 24.0 | 24 | <0.001 |
| rainforest leaves | 96.0±0.2 | no leaves | 4.0±0.2 | 36.0 | 36 | <0.001 | |
| Melaleuca leaves | 0±0 | no leaves | 100±0 | 30.0 | 30 | <0.001 | |