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The importance of trees for woody pasture bird diversity and effects of the EU tree density policy [Journal of Applied Ecology]

Keywords : bird diversity, biodiversity conservation, Common Agricultural Policy (CAP), environmental policy, grassland, grazing, management, tree density limit, woody pasture

par Frédéric Magné - publié le

1.Recent reforms in the Common Agricultural Policy (CAP) aim for a greening of the subsidy system with potential improvements for biodiversity conservation. As part of that process, the tree density limit for pastures to qualify for European Union (EU) subsidies has been increased from 50 to 100 trees per ha. However, recent studies show that the high biodiversity values of these habitats may be threatened by these limits, highlighting the need for policy improvements. Still, little is known about the direct effects of tree density limitations on bird communities in woody pastures.
2.We investigated how bird diversity and species composition are affected by tree density in 49 Swedish woody pastures along a gradient of 4 to 214 trees per ha.(...)

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