Mini-Infographic (IMAGE) Arizona State University Caption In a study led by scientists from Arizona State University, the University of Cambridge, University of Tartu and Estonian Biocentre, and published in the journal Genome Research, researchers discovered a dramatic decline in genetic diversity in male lineages four to eight thousand years ago -- likely the result of the accumulation of material wealth, while in contrast, female genetic diversity was on the rise. This male-specific decline occurred during the mid- to late-Neolithic period. Credit Sabine Deviche Usage Restrictions With artist credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.