Romano_et_al

Data on begging behaviour of nestling barn swallow. See README.txt for details

Survival of barn swallows in relation to antioxidant capacity (AOC; mmol l⁻¹ of HClO neutralised).

<p>Survival functions were fitted to data stratified according to individuals being of low (< population mean −1 Standard Deviation), intermediate (comprised between mean −1 SD and mean +1 SD), or high (> mean+1 SD) AOC. This analysis differs from that presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019593#pone-0019593-t001" target="_blank">Table 1</a> and was performed to allow representation of the association between AOC and survival.</p

Antioxidant capacity (AOC; mmol l⁻¹ of HClO neutralised) in relation to age.

<p>Mean (+ SE bar) AOC of individuals that were recorded to have survived up to 2 years (age class 1–2, n = 116), 3 years (1–3, n = 55), or 4 years (1–4, n = 28) (see Methods for details). For all age classes there was no significant variation of AOC with age in repeated-measures mixed models with individual as a random effect and age (covariate) and sex (factor) as fixed effects. When included in the model, the effect of the second order polynomial term of age was non-significant (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0019593#s3" target="_blank">Results</a>).</p

Cox model of hazard of death in relation to sex, AOC and tail length.

<p>Statistics for the main effects are obtained from a model which included no interactions. Statistics for individual interaction terms were obtained from different models including the main effects and the interaction term under scrutiny.</p><p>*: coefficients are multiplied by 10²;</p><p>**coefficients are multiplied by 10⁴.</p

Representative chromatogram of volatile compounds emitted by the eggs.

<p>Numbers above peaks indicate volatile compounds significantly different between sexes before false discovery rate adjustment (1: pentadecane; 2: tetradecane; 3: (1R,3R,4S)-2,2,4-trimethyl bicyclo[2.2.1]heptan-3-ol; 4: formamide; 5: 5-methyl-3-hexanol; 6: decanal; 7: formic acid; 8: 2-methylpropanoic acid; 9: 5-(dithiolan-3-yl)pentanoic acid; 10: 2-ethylhexanoic acid). Asterisk above peak indicates the volatile compound significantly different between sexes after false discovery rate adjustment.</p

Paired t-test of the difference in the concentration of volatile compounds between eggshell halves placed in nests in the cowshed and eggshells kept in the lab.

<p>Paired t-test of the difference in the concentration of volatile compounds between eggshell halves placed in nests in the cowshed and eggshells kept in the lab.</p

Length of the growing R₄ in relation to time since feather removal.

<p>Length of the growing R₄ relative to the length of the original R₄ in relation to time since removal of the original R₄. The continuous lines represent the Gompertz functions fitted to the data.</p

Length of the growing replacement feather in relation to time since removal.

<p>Linear models of the residuals of replacement R₄ length relative to original R₄ length on time since original feather removal (LengthRe in the text), on date and breeding stage for either sex separately or for the two sexes pooled. The statistics for the intercept and the first-order term for females are obtained from a model excluding the non-significant second-order polynomial term (in parentheses). Only re-growing feathers measured less than 40 days after plucking are considered (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0096428#pone-0096428-g002" target="_blank">Fig. 2</a>).</p

Length of the growing R₄ in relation to time breeding stage at feather removal.

<p>Variation of LengthRe (see Methods) in relation to breeding stage for the replacement feathers measured less than 40 days after removal of the original feather. The linear function fitted to females (F), the second-order polynomial function fitted to males (M), and the second-order polynomial function fitted to the two sexes pooled (F+M) are shown.</p

Mean (± SE) percentage on total volatile organic compounds (% on total VOCs) in the two sexes (male: dark grey; female: light grey).

<p>Volatile compounds are grouped according to their classes (a. ketones; b. hydrocarbons; c. terpenes; d. ammides; e. alcohols; f. aldehydes; g. free fatty acids). Asterisks indicate significant differences in the concentration of the volatile compounds between sexes. Double asterisks indicate that the volatile compound significantly differed between sexes after false discovery rate adjustment.</p