1: Introduction 2: The role of the International Council for Scientific Unions in biodiversity and global change research, J W M La Riviere 3: Towards biodiversity in politics, H Alders 4: Biodiversity: an introduction, O T Solbrig 5: Theoretical Considerations 6: Dynamical systems, biological complexity and global change, G Nicolis 7: Biodiversity at a molecular level, J C Mounolou 8: Genetic diversity and its role in the survival of species, W van Delden 9: The geophysical aspects of diversity, J E Lovelock 10: Biodiversity in space and time 11: Past efforts and future prospects towards understanding how many species there are, R M May 12: Biodiversity in microorganisms and its role in ecosystem function, D L Hawksworth 13: Molecular phylogeny of cellular systems: Comparisons of 5S ribosomal RNA sequences, H Hori 14: The role of biodiversity in marine ecosystems, P Lasserre 15: The role of mammal biodiversity in the function of ecosystems, V E Sokolov 16: The role of biodiversity in the function of Savanna ecosystems, E Medina and O Huber 17: Global change, shifting ranges, and biodiversity in plant ecosystems, T van der Hammen 18: Shifting ranges and biodiversity in animal ecosystems, J H Stock 19: Conservation of biodiversity: natural and human aspects 20: Life-history attributes and biodiversity, D L Urban et al. 21: Global change and alien invasions: implications for biodiversity and protected land area management, I A W Macdonald 22: Human aspects of biodiversity: an evolutionary perspective, R K Colwell