"Population size" refers to the total number of individuals in a particular group or community. It helps us understand the quantity or scale of a population. Full definition
This could result from neutral processes if the effective population size of males is reduced relative to females due to a higher variance in the number of offspring from males than from females. (nielsenlab.org)
This cold snap would have made life difficult for our African ancestors, and the genetic evidence points to a sharp reduction in population size around this time. (religion.blogs.cnn.com)
The researchers found that the species that died out had lower genetic diversity than the ones that survived — a hallmark of small population size. (sciencedaily.com)