The relative size of the bottleneck and duration of the bottleneck were confounded as suggested by a previous study (Eyre-Walker et al. 1998).
One-hundred samples were simulated for each combination of bottleneck size, duration and age, and the 95% upper quantile was computed for all statistics for each combination of parameters.
38, 39, 55, 66 Indeed, heterozygosity seems to be less affected by population bottlenecks of short duration than by the number of alleles at a given locus.
The duration of bottleneck (db) was set at a maximum of 300 generations (1200 years).
Another attribute of the long-term viability of populations is the ability to recover from population 'bottlenecks', which is directly related to the intrinsic rate of population growth and duration of bottleneck.
Then, we used an ABC framework to identify the most probable among different colonization scenarios and to infer several key parameters of the foundation history of olives in East Australia and Hawaii (e.g. duration of bottlenecks, effective number of founders).
To check whether the observed statistics were compatible with purely demographic events (i.e. bottlenecks in the case of positive tests), all significant mutation-drift equilibrium statistics were re-computed on simulated data sets having the same descriptive statistics as the observed data and having undergone bottlenecks of varying size, duration, and timing.
The effect of such bottlenecks depends upon the effective size of the ancestral population, its initial variation, the duration of the bottleneck, and the nature of the marker under study.
However, the duration of the bottleneck T B was also much shorter than the period of exponential growth T after the bottleneck: T B = 0.0113 T (95% CI: 0.0054 - 0.0195 T), which may limit the loss of genetic diversity.
We randomly choose a certain number of packets among all outstanding packets, dropped them into the bottleneck links and measured the duration.
