The cost of food was rising fast even before the bad weather moved in, as an increasingly prosperous population began to demand as staples agricultural products previously seen as luxuries.
"The whole thing could be over in 24 hours; at other times it could take months to see a slight move in the population," he said.
For example, if we assume there are 100 individuals that can move in the population, and other parameters are set such that one individual is moving away from home each day, then on average, each individual can move away from home every 100 days.
Presently, they continue to move south, increasing in population size throughout the Spotted Owl range [11], [19].
He described them as translucent, extremely small but highly mobile, and moving in dense populations.
In America's Rust Belt and parts of the Northeast, millennials and young professionals are leaving rather than moving in, and populations there are dwindling.
However, selection for antigenic novelty may result in extended or deep bifurcations of the pathogen population, where a sub-set of the population moves in one antigenic (and genetic) direction and another subset moves in another antigenic direction.
There has never before been a time in which the places that are seeing the biggest productivity growth in the economy are not the places than most people are moving forward, not gaining in population, right?
There is also immediate ROI for investments in basic services as population moves in, because they capture new revenues from new users.
Over the course of evolution, a population moves in this space by acquiring neighboring genotypes of existing ones through mutation or recombination.
