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Figures
- Fig. 1.
Experimental set-up showing odour presentation to a sleeping Blue petrel chick. Note the position of the light bulb (1) and squeeze bottle (2). We use the term `sleeping' following the convention of Porter et al. (1999); it may be that birds were not technically sleeping.
- Fig. 2.
Mean scores for blue petrel responses to control (black), DMS (dimethyl sulphide; white) and PEA (phenyl ethyl alcohol; gray) odourant presentations. Single and double asterisks indicate significant differences (Wilcoxon signed-rank test, *P<0.05; **P<0.01; N=30) between the response to an odourant and the distilled water control.
- Fig. 3.
Mean scores for thin-billed prion responses to control (black), DMS (dimethyl sulphide; white) and PEA (phenyl ethyl alcohol; gray) odourant presentations. Single asterisks indicate significant differences (Wilcoxon signed-rank test, P<0.05; N=12) between the response to an odourant and the distilled water control.
- Fig. 4.
Mean scores for common diving petrel responses to control (black), DMS (dimethyl sulphide; white) and PEA (phenyl ethyl alcohol; gray) odourant presentations. No significant difference (see text) between the response to an odourant and the distilled water control was found.
- Fig. 5.
Scatter plots of mean score (mean of control, DMS andPEA) versus chick mass for (A) blue petrels, (B) thin-billed prions and (C) common diving petrels. The trend line for blue petrels highlights a statistically significant Spearman ρ correlation. The sample size for thin-billed prions (12) provides too low a statistical power for detecting an association. Power analysis for the Pearson Product Moment (the parametric equivalent of Spearman's ρ correlation coefficient) indicates that a sample size of 34 is needed for a 90% chance of detecting a ±0.50 correlation coefficient (Cohen, 1988).
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