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Changes in Mallard Anas platyrhynchos bill morphology after 30 years of supplemental stocking

Jocelyn Champagnon, Auteur ; Matthieu Guillemain, Auteur ; Johan Elmberg, Auteur ; Karin Folkesson, Auteur ; Michel Gauthier-Clerc, Auteur

Dans Bird Study (57(3) 2010)

Capsule Massive releases of captive-reared Mallard for hunting purposes have been practiced for 30 years. During this period the number of lamellae per centimetre of bill length in wild Mallard populations has decreased. Aims Every year since th[...]

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Putting density dependence in perspective: nest density, nesting phenology, and biome, all matter to survival of simulated mallard Anas platyrhynchos nests

Johan Elmberg, Auteur ; Karin Folkesson, Auteur ; Matthieu Guillemain, Auteur ; Gunnar Gunnarsson, Auteur

Dans Journal of Avian Biology (40(3) MAY 2009)

Breeding success in ground-nesting birds is primarily determined by nest survival, which may be density-dependent, but the generality of this pattern remains untested. In a replicated crossover experiment conducted on 30 wetlands, survival of si[...]

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