|Early nests are more susceptible to predation|
In another paper just published on-line (2), Patrick White's further analysis of nest data collected over the same period by John Szczur reveals that, as well as blackbird and song thrush, nest survival of dunnock, chaffinch and yellowhammer also benefited from the removal of nest predators during the breeding season as part of systematic game management. For whitethroat, the sixth species studied, there was no such effect. However, when less intensive control of crows and magpies only was carried out, only blackbird showed higher nest survival.
1. White, P.J., Stoate, C., Szczur, J. & Norris, K. (2008) Investigating the effects of predator removal and habitat management on nesting success and breeding population size of a farmland passerine: a case study. Ibis 150 (Suppl.1), 178-190.
2. White, P., Stoate, C., Szczur, J. & Norris, K. (2014) Predator reduction with habitat management can improve songbird nest success. Journal of Wildlife Management DOI: 10.1002/jwmg.687