Part I Status of Seagrass: Global seagrass distribution, (F.T. Short, R.G. Coles, C. Pergent-Martini); Seagrass taxonomy and identification key, (J. Kuo, C. den Hartog); Reproduction and phenology in seagrasses, (D.I. Walker, B. Olesen, R.C. Phillips). Part II Seagrass Research Methods: Standards for seagrass collection, identification and sample design, (D.M. Burdick, G.A. Kendrick); Methods for mapping seagrass distribution, (L.J. McKenzie, M.A. Finkbeiner, H. Kirkman); Methods for assessing seagrass seed ecology and population genetics, (G.J. Inglis, M. Waycott); Methods for the measurement of seagrass abundance and depth distribution, (C.M. Duarte, H. Kirkman); Methods for the measurement of seagrass growth and production, (F.T. Short, C.M. Duarte); Measurements of photosynthetic rates in seagrasses, (S. Beer, M. Bjork, R. Gademann, P. Ralph); Assessing biomass, assemblage structure and productivity of algal epiphytes on seagrasses, (G.A. Kendrick, P.S. Lavery); Methods to measure macroalgal biomass and abundance in seagrass meadows, (B. Japar Sidik, S.O. Bandeira, N.A. Milchakova); Techniques for quantitative sampling of infauna and epifauna in seagrass, (A. Raz-Guzman, R.E. Grizzle); Fish, crabs, shrimps and other large mobile epibenthos - measurement methods for their biomass and abundance in seagrass, (G.J. Edgar, H. Mukai, R.J. Orth); Measuring invertebrate grazing on seagrasses and epiphytes, (V. Zupo, W.G. Nelson, M.C. Gambi); Methods for assessing the grazing effects of large herbivores on seagrasses, (C. Supanwanid, J.O. Albertsen, H. Mukai); Seagrass decomposition (D.I. Walker, G. Pergent, S. Fazi); Measurements of physical parameters in seagrass habitats, (E.W. Koch, J.J. Verduin); Sediment geology methods for seagrass habitat, (P.L.A. Erftemeijer, E.W. Koch); Measurement of light penetration in relation to seagrass, (T.J.B. Carruthers, B.J. Longstaff, W.C. Dennison, E.G. Abal, K. Aioi); Water quality measurement methods for seagrass habitat, (S. Granger, H. Iizumi). Part III Seagrass Habitat Conservation: Improving seagrass habitat quality (W.Lee Long, R.M. Thom); Seagrass transplantation and other seagrass restoration methods (H. Calumpong, M. Fonseca); Protecting seagrass - approaches and methods (R.G. Coles, M.D. Fortes).