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David G. Raffaelli is Director of the UK's NERC Centre, UKPopNet. He has written extensively on aspects of ecosystem ecology, especially food webs and integrated catchment ecology, and more recently has become extensively involved with the ecosystem services approach to the management of natural resources within the UK and Europe through his work with DIVERSITAS, UKBRAG, the Royal Society's Global Environment Research Committee, Defra and the BES. Christopher L. J. Frid is Professor of Marine Biology at the University of Liverpool and a long standing member of the BES. He is a member of Defra's Marine Fisheries Science Advisory Group and the Council of the Marine Biological Association of the United Kingdom. He has written extensively on aspects of marine ecology and human impacts on marine ecosystems and has been a major proponent of the development of the ecosystem approach to marine management.