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. Author manuscript; available in PMC: 2019 Sep 26.
Published in final edited form as: J Anim Ecol. 2010 Jan 20;79(2):436–444. doi: 10.1111/j.1365-2656.2009.01653.x

Table 2:

Influence of age (a), year (y), and cohort (c) on survival rates of males and females (models 1–8), and the influence of the individual covariates cumulative reproduction (CR) and age of first breeding attempt (AFB) on survival rates (models 9–12). Covariates are only included as linear and quadratic trends with underlying age-specificity in survival. In the covariate models, the influence of age is parametrically linear or quadratic.

# Survival model QAICc Males ΔQAICc Estimable parameters QAICc Females ΔQAICc Estimable parameters
1 age 1589.29 0.00 15 1323.39 0.00 15
2 year 1903.67 314.38 20 1568.87 245.48 20
3 cohort 1923.39 334.10 19 1590.64 267.25 19
4 constant 1948.60 359.31 1 1595.62 272.23 1
5 age: linear trend 1677.80 88.51 2 1447.68 124.29 2
6 age: linear and quadratic trend 1637.96 48.67 3 1365.53 42.14 3
7 age x year 1721.32 132.03 157 1472.58 149.19 151
8 age + year 1604.02 14.73 35 1470.25 146.86 35
9 age: linear regressions for CR 1602.49 13.20 26 1406.28 82.89 25
10 age: linear & quadratic regressions for CR 1618.20 28.91 37 1379.10 55.71 35
11 age: linear regressions for AFB 1600.52 11.23 26 1405.01 81.62 25
12 age: linear & quadratic regressions for AFB 1613.11 23.82 34 1378.52 55.14 34

All QAICc values are corrected for overdispersion ĉ = 3.59 for males and 3.76 for females, as calculated from model 1.The overdispersion factor could not be calculated from model 7. The correction for overdispersion was applied in the covariate models (Models 9–12).