Contents: List of contributors,Preface,The idea of mutualism,past and future,Symbiosis and mutualism: crisp concepts and soggy semantics,The natural history of mutualisms,Cost: benefit models of mutualism,Population genetics and the coevolution of mutualism,Evolution a mutualistic environment,Equilibrium populations and long-term stability of mutualistic algae and invertebrate hosts,Cheating and taking advantage in mutualistic associations,Competition in mutualistic systems,The dynamics of microbial commensalisms and mutualisms,Mutualism,limited competition and positive feedback,Indirect facilitation and mutualism,A food web approach to mutualism in lake communities, Mutualism in agriculture, Index.