Landowners undertake management measures to improve habitats for quarry species, including shrub planting, coppicing and skylighting to encourage understory growth. Roger Draycott of the Game and Wildlife Conservation Trust has reported the conservation benefits of game management schemes in the UK, including woodlands that exhibit denser undergrowth and higher abundances of native birds. However, overall evidence that game shooting is beneficial to wider biodiversity has been inconclusive: high densities of game birds are known to negatively impact ecosystems, resulting in shorter grassland vegetation, lower floral diversity in semi-natural woodlands, fewer saplings in hedgerows leading from such woodlands, and possible reductions in arthropod biomass attributable to predation.