Zanzibar, Tanzania, East Africa.

A) Computational mesh and bathymetry. B) Model area showing the agents (orange) and the area division into polygons. C) Downstream connectivity matrix for the 10 polygons in Zanzibar coastal area. The color code indicates the probability of the shoots from each polygon (FROM) to end up in each of the other 10 polygons (TO), with the diagonal elements being the probability of the shoots to stay in the same polygon (self-recruitment).