Table 2.
Male quality correlates of (a) age, (b) season, and (c) social context changes in trill performance components. Tables show reduced set of variables after stepwise analysis, the df, F, p and direction for each variable, and the adjusted R2 for the whole model. The only significant p-value after subtablewise correction for multiple tests is shown in bold
| Performance component (N) | Variables in reduced model | df | F | p | Direction | Adj. R2 |
|---|---|---|---|---|---|---|
| (a) Age changes | ||||||
|
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| Consistency (61) | Known age | 1, 12.9 | 4.47 | 0.055 | yes>no | 0.301 |
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| Vocal deviation (38) | Survival | 1, 14.5 | 2.76 | 0.118 | − | 0.280 |
| Condition | 1, 11.8 | 4.70 | 0.051 | + | ||
|
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| Bandwidth (38) | Known age | 1, 12.9 | 5.39 | 0.037 | yes>no | 0.473 |
| Survival | 1, 13.4 | 3.96 | 0.127 | + | ||
| Condition | 1, 13.1 | 3.93 | 0.069 | − | ||
|
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| Note rate (61) | Minimum age | 1, 13.3 | 3.20 | 0.096 | + | 0.161 |
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| (b) Season changes | ||||||
|
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| Consistency (52) | Aggressive resp | 1, 21.3 | 3.76 | 0.066 | − | 0.458 |
|
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| Vocal deviation (52) | Aggressive resp | 1, 27.7 | 3.25 | 0.083 | − | 0.580 |
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| Bandwidth (52) | Aggressive resp | 1, 27.9 | 4.18 | 0.050 | + | 0.085 |
| Nest stage | 1, 29.8 | 4.97 | 0.034 | b&l>i&n&u* | ||
|
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| Note rate (52) | Successful nest | 1, 22.6 | 3.99 | 0.058 | − | 0.600 |
| Nest stage | 1, 47.1 | 4.87 | 0.032 | b&n&u>l&i* | ||
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| (c) Social context changes | ||||||
|
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| Consistency (19) | No variables added | |||||
|
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| Vocal deviation (19) | Aggressive resp | 1, 13.2 | 2.49 | 0.138 | − | 0.858 |
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| Bandwidth (19) | No variables added | |||||
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| ||||||
| Note rate (19) | Aggressive resp | 1, 11.0 | 14.65 | 0.003 | + | 0.922 |
| Type in stimulus | 1, 12.7 | 4.17 | 0.063 | yes>no | ||
| DC mean time | 1, 11.3 | 3.91 | 0.073 | − | ||
| Minimum age | 1, 11.4 | 3.32 | 0.095 | + | ||
*
b=building, l=laying, i=incubating, n=nestlings/fledglings, u=unpaired