ON THE VALUE OF A COLLECTION OF SPECIES

One justification for species conservation is the possibility that spe cies will be found to be beneficial. Existing models of the value of a collection of potentially beneficial species typically assume that th e probability that each species is beneficial does not depend on the o utcome for other species. It is also typically assumed that beneficial species are perfect substitutes. This paper describes a model under w hich both these assumptions are relaxed. (C) 1995 Academic Press, Inc.