Long-term changes in chick survival rate and brood size in the Grey Partridge Perdix perdix in Poland

Capsule: Data from 4801 Grey Partridge Perdix perdix broods collected in Poland during1987-2013 show that, over the 27 years of study, average brood sizes declined from 10.2 to 6.7 and chick survival fell from 57% to 34%. A probable cause of these trends was a 2.5 fold increase in the use of pesticides over the same time period.