Part 1 Issues: Why link species and ecosystems? - a perspective from ecosystem ecology, Nancy B. Grimm; Organisms and species as complex adaptive systems - linking the biology of populations with the physics of ecosystems, James H. Brown. Part 2 Scope: Bioturbators as ecosystem engineers - control of the sediment fabric, inter-individual interactions, and material fluxes, Jeffrey Levinton; Biogeochemical processes and marine benthic community structure - which follows which? Anne E. Giblin, Kenneth H. Foreman and Gary T. Banta; Marine snow - what it is and how it affects ecosystem functioning, M.W. Silver, S.L. Coale, D.K. Steinberg and C.H. Pilskahn; Floods, food chains, and ecosystem processes in rivers, Mary E. Power; Population variability in experimental ecosystems, Michael L. Pace, Stephen R. Carpenter, and Patricia A. Soranno; How important are consumer species to ecosystem functioning? Nancy Huntly; Linking tree population dynamics and forest ecosystem processes, Charles D. Canham and Stephen W. Pacala; Soil organisms as engineers: microsite modulation of macroscale processes, J.M. Anderson; Soil fauna - linking different levels of the ecological hierarchy, Robert W. Parmelee; Beaver as engineers - influences on biotic and abiotic characteristics of drainage basins, Michael M. Pollock, Robert J. Naiman, Heather E. Erickson, Carol A. Johnston, John Pastor and Gilles Pinay; Atmospheric oxygen and the biosphere, Heinrich D. Holland. Part 3 Approaches: Linking species and ecosystems - organisms as ecosystem engineers, John H. Lawton and Clive G. Jones; Top-level carnivores and ecosystem effects - questions and approaches, James A. Estes; Food webs in soil - an interface between population and ecosystem ecology, Jan Bengtsson, David Wei Zheng, Goren I. Agren and Tryggve Persson; Unifying ecological subdisciplines with ecosystem food webs, Neo D. Martinez; Coupling the dynamics of species and materials, William S.C. Gurney, Alex H. Ross and Niall Broekhuizen; Exploring aggregation in space and time, Monica G. Turner and Robert V. O'Neill; Aggregation of species properties for biogeochemical modeling: empirical results, David S. Schimel, V.B. Brown, K.A. Hibbard, C.P. Lund and S. Archer; Functional redundancy and process aggregation: linking ecosystems to species, Edward B. Rastetter and Gaius R. Shaver; Species compensation and complementarity in ecosystem function, Thomas M. Frost, Stephen R. Carpenter, Anthony R. Ives and Timothy K. Kratz; Elemental stoichiometry of species in ecosystems, Robert W. Sterner; Species, nitrogen and grassland dynamics: the constraints of stuff, David A. Wedin; Relationships between the energetics of species and large scale species richness, Donald L. DeAngelis; Linking species and ecosystems - where's Darwin? Robert D.