Data from: Incubation temperature affects growth and energy metabolism in blue tit nestlings

However, the effects of such temperature variation on nestling development remain relatively unexplored. To investigate this we artificially incubated wild blue tit (Cyanistes caeruleus L.) clutches at 35.0 °C, 36.5 °C or 38.0 °C during two thirds of the incubation period.

We returned clutches to their original nests prior to hatching and subsequently recorded nestling growth and resting metabolic rate. The length of the incubation period decreased with temperature whereas hatching success increased.. Nestlings from the lowest incubation temperature had shorter tarsus length at two weeks of age, but body mass and wing length were not affected by temperature.