marginally non-significantp = 0.059
Breeding success and productivity were also lower for birds based on field monitoring estimates compared to using field-corrected GPS data, although these differences were marginally non-significant (success: X 2 = 1.22, d.f. = 2, p = 0.059; productivity: X 2 = 0.79, d.f. = 2, p = 0.077; figure 2 b , c ).