Table 1.
Predicted self-seeding rate for OTI and downstream capture rates at reefs W, H and S at time Tmax + 4 days. The model was run for various scenarios determined by the following physical and biological parameters, namely (i) the subgrid-scale turbulent horizontal diffusion coefficient Kx, (ii) the maximum swimming cruise velocity Umax of the fish larvae, (iii) the pre-flexion time Tpre-flexion of the larvae, (iv) the time Tmax at which the larvae start swimming at maximum swimming cruise velocity, (v) the width W of the band around reefs in which larvae can hear the reefs, and (vi) the ability to detect a odour gradient where the concentration is at least 0.1% (odour = 0.1), 1% (odour = 1) and 10% (odour = 10) that at 400 m from the source. The model accounted only for the larvae that survive. Non-swimming larvae were assumed to start to recruit on day 5 after spawning. Swimming larvae were assumed to be able to recruit when T > Tpre-flexion. The larvae were assumed to stop swimming on reaching the pelagic larval duration PLD (PLD = Tmax + 4 days).
| scenario number | Kx (m2 s−1) | Umax (m s−1) | Tpre-flexion (day) | Tmax (day) | PLD (day) | W (m) | odour | self-seeding rate (%) | downstream capture rate (%) | directional swimming |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 5.9 | 0.04 | N | |||||
| 2 | 5 | 0 | 1.2 | 0.5 | N | |||||
| 3 | 10 | 0 | 0.6 | 1.3 | N | |||||
| 4 | 5 | 0.15 | 7 | 10 | 14 | 2000 | 0.1 | 19.3 | 7.6 | Y (sound+smell) |
| 4a | 5 | 0.15 | 7 | 10 | 14 | 0 | 0.1 | 4.2 | 1.2 | Y (smell only) |
| 4b | 5 | 0.15 | 7 | 10 | 14 | 2000 | no | 7.9 | 4.3 | Y (sound only) |
| 5 | 1 | 0.15 | 7 | 10 | 14 | 2000 | 0.1 | 28.8 | 0.44 | Y (sound + smell) |
| 6 | 3 | 0.15 | 7 | 10 | 14 | 2000 | 0.1 | 27.3 | 4.5 | Y (sound + smell) |
| 7 | 7 | 0.15 | 7 | 10 | 14 | 2000 | 0.1 | 14 | 8.5 | Y (sound + smell) |
| 8 | 10 | 0.15 | 7 | 10 | 14 | 2000 | 0.1 | 9.3 | 9.1 | Y (sound + smell) |
| 9 | 5 | 0.05 | 7 | 10 | 14 | 2000 | 0.1 | 10.7 | 5.3 | Y (sound + smell) |
| 10 | 5 | 0.1 | 7 | 10 | 14 | 2000 | 0.1 | 15.9 | 8.1 | Y (sound + smell) |
| 11 | 5 | 0.2 | 7 | 10 | 14 | 2000 | 0.1 | 19.8 | 7.9 | Y (sound + smell) |
| 12 | 5 | 0.25 | 7 | 10 | 14 | 2000 | 0.1 | 20 | 8.2 | Y (sound + smell) |
| 13 | 5 | 0.15 | 7 | 10 | 14 | 1000 | 0.1 | 14.8 | 4.8 | Y (sound + smell) |
| 14 | 5 | 0.15 | 13 | 17 | 21 | 2000 | 0.1 | 10.8 | 5.9 | Y (sound+smell) |
| 15 | 5 | 0.15 | 15 | 18 | 22 | 2000 | 0.1 | 3 | 3 | Y (sound + smell) |
| 16 | 5 | 0.15 | 24 | 27 | 31 | 2000 | 0.1 | 0.4 | 0.5 | Y (sound + smell) |
| 17 | 5 | 0.15 | 7 | 10 | 14 | 2000 | 1 | 12 | 5 | Y (sound + smell) |
| 18 | 5 | 0.15 | 7 | 10 | 14 | 2000 | 10 | 8.1 | 4.5 | Y (sound + smell) |