Supporting data

Original data for winter and breeding survival, and biometrics at recapture, in blue tits that hatched from clutches that had been incubated in one of three biologically relevant incubation temperatures

nestling biometric data

Biometric measurements (mass, tarsus and wing length) on experimental blue tit nestlings at 6 and 14 days of age, collected over three years in south central Sweden. Treatment categories: H = 38.0 C; M = 36.5 C; L = 35.0 C. 'NA' = missing data

nestling rmr data

Data on resting metabolic rate (RMR; ml O2 / min) in experimental blue tit nestlings. Data was collected by means of flow through respirometry in the darkness in thermoneutrality during the night between nestlings days 14-15, during three years. Treatment categories: H = 38.0 C; M = 36.5 C; L = 35.0 C. 'Channel' = Respirometer channel

brood mass d2 data

Data on the average mass (g) of wild blue tit broods at two days of age, collected during three years in south central Sweden. Treatment categories: H = 38.0 C; M = 36.5 C; L = 35.0

incubation period and hatching success data

Data on length of the incubation period and hatching success in experimental blue tit nests. Data also includes reference information from unmanipulated nests in the field. Data were collected over three years in south central Sweden. Treatment categories: H = 38.0 C; M = 36.5 C; L = 35.0 C; C = Reference nests

nest provisioning data

Data on parental nest provisioning rates (as feedings / h / chick) in experimental blue tit nests. Data was collected by means of PIT-tags during nestlings days 8-10, during three years in south central Sweden. Treatment categories: H = 38.0 C; M = 36.5 C; L = 35.0 C. 'NA' = missing data

Table S1 from Testing the heat dissipation limit theory in a breeding passerine.

By using own and published data on BMR, feeding frequency, flight distance, and energy demand for flying, foraging, self-maintenance and moult, we estimated the total energy demand during an hour of nestling feeding in parents tending enlarged, control and reduced broods, respectively. Parents tending reduced broods were hypothesized to have started to moult during breeding

Cooling data, nest temperatures and body mass for blue tit nestlings

Data on cooling rate, nest temperature, body mass and validation of thermal imaging measurements/cloacal measurements from field experiments on blue tit nestlings. Explanations of all variables are provided in the sheet named "Metadata"

Measurements of body- and nest temperatures, nestling biometrics and survival data of blue tit nestlings

Body-, ambient- and nest temperature together with nestling biometrics, survival data and direction of nest-boxes. The last sheet, named Metadata, contains descriptions of all variables

Species included in the analyses and their sample size and measured mass range. Nomenclature following Barrow and Demey [19].

<p>Species included in the analyses and their sample size and measured mass range. Nomenclature following Barrow and Demey [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0161481#pone.0161481.ref019" target="_blank">19</a>].</p