A little late I know but then peer-review can take a while, especially when your paper gets a rough ride....
Pheasants, buzzards, and trophic cascadesAlexander C. Lees1,2, Ian Newton3, & Andrew Balmford2
1Coordenacao de Zoologia, Museu Paraense Emilio Goeldi, Avenida Perimetral 1901, Terra Firme, Belem, Para, 66077-530, Brazil
2Conservation Science Group, Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
3Centre for Ecology & Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford, Oxon OX10 8BB, UK
AbstractThe partial recovery of large birds of prey in lowland Britain has reignited conflicts with game managers and prompted a controversial U.K. government proposal to investigate ways of limiting losses to pheasant shooting operations. Yet best estimates are that buzzards are only a minor source of pheasant mortality–road traffic, for example, is far more important. Moreover, because there are often large numbers of nonbreeding buzzards, local control of breeding pairs may simply lead to their replacement by immigrant buzzards. Most significantly, consideration of the complexity of trophic interactions suggests that even if successful, lowering buzzard numbers may directly or indirectly increase the abundance of other medium-sized predators (such as foxes and corvids) which potentially have much greater impacts on pheasant numbers. To be effective, interventions need to be underpinned by far more rigorous understanding of the dynamics of ecosystems dominated by artificially reared, superabundant nonnative game species.
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http://onlinelibrary.wiley.com/doi/10.1 ... x/abstract
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Dr Alexander C. Lees
Lecturer in tropical ecologyManchester Metropolitan University
Lab Associate
Cornell Lab of Ornithology,
Cornell University
http://www.freewebs.com/alexlees/index.htm@Alexander_Lees