http://www.scientificamerican.com/artic ... -diversityEndangered Species: Humans Might Have Faced Extinction 1 Million Years Ago
A new approach to probe ancient regions of the genome suggests early human populations were scarce
New genetic findings suggest that early humans living about one million years ago were extremely close to extinction.
The genetic evidence suggests that the effective population—an indicator of genetic diversity—of early human species back then, including Homo erectus, H. ergaster and archaic H. sapiens, was about 18,500 individuals (it is thought that modern humans evolved from H. erectus), says Lynn Jorde, a human geneticist at the University of Utah in Salt Lake City. That figure translates into a total population of 55,500 individuals, tops.
One might assume that hominin numbers were expanding at that time as fossil evidence shows that members of our Homo genus were spreading across Africa, Asia and Europe, Jorde says. But the current study by Jorde and his colleagues suggests instead that the population and, thus its genetic diversity, faced a major setback about one million years ago. [...]
http://www.pnas.org/content/early/2010/01/06/0909000107
http://www.physorg.com/news183278038.html
http://en.wikipedia.org/wiki/Toba_catastrophe_theory
So the entire planet's hominid breeding population at that time would have fitted twice in my hometown today!
