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World wide coral reef decline has now been well nities, species have been understood to interact in a documented, but the actual dynamics of this disturbing phehierarchical web of competitive interactions, In all of nomenon are still far from understood. In t h ~ s note we the above models, a set of N species colonize and comdescribe a simple spatial mathematical model that attempts to capture some of the important ecoloyical processes-includpete a large number patches a ing colonization, mortality and competition for space-all of ranked hierarchy; species 1 1s taken to be the best which govern questions of spec~es coexistence in coral comcompetitor for space, while species N is the weakest. munities. The model is then extended to determine what enhance coexistence, the model incorporates a might happen to a community if a proportion of the spatial landscape is destroyed and can no longer be occupied, We 'competition-colonization' trade-off (Tilman 1994) such examine the species extinction debt incurred as habitat that the better competitors are poor colonizers while destruction increases and attempt to predict the characteristics of those species which are at greatest risk. To gain even further insights, the results of the model are compared with field-data from the reef flats of Eilat, Israel, as found in Loya's (1976; Ecology 57:278-289) classic study of community structure at reef sites damaged by chronic oil pollution.

Modelling coral reef biodiversity and habitat destruction