Fig. 4

The effect of altitude on the timing of breeding. The effect of altitude (all other variables set at their average values) on the timing of breeding (hatching day-of-year) in 1978 (solid line), 1987 (stapled line), 1996 (dotted), 2005 (stapled and dotted), 2015 (long staples) in the white-throated dipper population in Lyngdalselva 1978–2015