The estimated bottleneck had a credibility interval spanning a 50-year period between approximately 1920 and 1970, and this could be suggestive of the period over which the effects of the bottleneck persisted.
Yet while visa bottlenecks persist for high-skilled immigrants, on the whole, the census data show, the current system has brought a range of foreign workers across skill and income levels.
In turn, energy storage technology is improving very slowly, so most people think that a storage bottleneck will persist past 2050.
Hardening occurs when only one beneficial lineage in an initially soft sweep persists through a population bottleneck.
Bottlenecks are found to persist both above and below the threshold for multiple exciton generation for all the shell thicknesses investigated.
Despite natural and human-mediated population bottlenecks, we find that high MHC class I polymorphism persists across all populations.
Though isolated stands of adult D. cylindrus persist, there appears to be a severe population bottleneck during reproduction or dispersal.
First, some variability has persisted from Homo erectus, passing through the population bottleneck that characterized the origin of our own species (Garrigan and Hammer, 2006).
In practice there would be gradual acceleration and some dispersion, but observations of real bottleneck queues (e.g. [20]) show that dense traffic can persist for tens of kilometres downstream of a bottleneck.
