Ever-increasing interest in oceanography and marine biology and their relevance to global environmental issues creates a demand for authoritative reviews summarising the results of recent research. Oceanography and Marine Biology: An Annual Review has catered to this demand since its founding by the late Harold Barnes fifty years ago. Its objectives are to consider, annually, the basic areas of marine research, returning to them when appropriate in future volumes; to deal with subjects of special and topical importance; and to add new subjects as they arise.

The favourable reception accorded to all the volumes shows that the series is fulfilling a very real need: reviews and sales have been gratifying. A milestone in the history of the series, the fiftieth volume follows closely the objectives and style of the earlier volumes, continuing to regard the marine sciences—with all their various aspects—as a unity. Physical, chemical, and biological aspects of marine science are dealt with by experts actively engaged in these fields.

Iron Bioavailability in the Southern Ocean, C.S. Hassler, V. Schoemann, M. Boye, A. Tagliabue, M. Rozmarynowycz, and R.M.L. Mckay

Anthropogenic Nutrient Enrichment and Blooms of Harmful Phytoplankton, Richard J. Gowen, Paul Tett, Eileen Bresnan, Keith Davidson, April McKinney, Paul J. Harrison, Stephen Milligan, David K. Mills, Joe Silke, and Anne-Marie Crooks

Benthic Invertebrates in a High-CO2 World, Laura C. Wicks, and J. Murray Roberts

Changing Coasts: Marine Aliens and Artificial Structures, Frédéric Mineur, Elizabeth J. Cook, Dan Minchin, Katrin Bohn, Adrian MacLeod, and Christine A. Maggs

Challenges to the Assessment of Benthic Populations and Biodiversity as a Result of Rhythmic Behaviour: Video Solutions from Cabled Observatories, Jacopo Aguzzi, Joan B. Company, Corrado Costa, Marjolaine Matabos, Ernesto Azzurro, Antoni Mànuel, Paolo Menesatti, Francesc Sardà, Miquel Canals, Eric Delory, Danelle Cline, Paolo Favali, Kim S. Juniper, Yasuo Furushima, Yoshiro Fujiwara, Juan J. Chiesa, Leonardo Marotta, Nixon Bahamon, and Imants G. Priede

Measuring the Performance of Spatial Management in Marine Protected Areas, Jodie Kemp, Gregory P. Jenkins, David C. Smith, and Elizabeth Fulton