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CotSim : Scientific visualisation and gaming-simulation for the Acanthaster phenomenon

CotSim is a new type of population model for Acanthaster planci on the Great Barrier Reef (GBR). This multi-reef model simulates the population dynamics of Acanthaster on 270 reefs in the central GBR and integrates recent oceanographic modelling studies of the area. It has been designed to facilitate experimentation by non-modellers. Users can change initial conditions or any of the parameters for the underlying model, as well as editing (eg. controlling) starfish populations while the model is running. The model uses the standard graphical user interface, Microsoft Windows 3.x. Populations on reefs are viewed using simple point and click operations, and the history of Acanthaster / cord dynamics is easily accessed. Latitude versus time plots of Acanthaster populations on the GBR can also be constructed. Acanthaster dynamics are represented by a density-dependent size structured matrix model. Coral dynamics are represented by logistic equations. Spawning and fertilisation are stochastic processes quantified by user-defined parameters. The spatial structure of larval dispersal is determined by extensive oceanographic studies of the GBR. The motivation for this research was to experiment with new methods of presenting models to the scientific community. Surveys have been designed and distributed in an attempt to gather responses. Introduction The Acanthaster phenomenon (Moran 1986, Birkeland and Lucas 1990) is a potentially recurrent management problem on the Great Barrier Reef (GBR). The two documented outbreaks of the starfish have affected substantial portions of the central GBR, and