Table 1.
Demographic data used to define projection matrices for three independent red fox populations and a ‘generic’ population based on data from the three other populations.
Figure 1.
Likelihood distributions for demographic parameters of the hunted Australian population.
From left to right for age classes 1 to 4.: (a–d) survival rates (Px), (e–h) probability of breeding (Bx) and (i–l) litter size (mx). All likelihoods were rescaled to peak at 1.0.
Figure 2.
Asymptotic population growth rates (λ) for three red fox populations and a ‘generic’ population.
The figure shows point estimates, determined from the dominant eigenvalue of the population's projection matrix (open circles), as well as mean (filled circles) and 95% confidence intervals (error bars) determined from 104 Monte Carlo resamples from the likelihood distributions of all underlying parameters. The line at λ = 1 indicates stability.
Figure 3.
Effect of sample size on uncertainty associated with estimated asymptotic population growth (λ).
(a) 95% confidence intervals were calculated by resampling with replacement from the individuals available from the generic population (see text for further details). Letters indicate total sample sizes for the age distributions of the focal populations [A(N), non-hunted Australia = 101; A, Australia = 848; U, USA = 3255; G, Generic = 4204]. (b) Log sample size plotted against log of the width of the 95% confidence intervals (slope = −0.50).