> Consider that surviving severe overpopulation is trauma

Recently there was an article posted on HN about how trauma experienced by parents are passed down to children through (a term that means it's related to activation of genes, I believe, but not DNA itself... I thought it was metagenomics but upon looking at the definition I don't think that's it). Perhaps the trauma of overpopulation activated or deactivated some genes which in turn reduced reproduction rate in offspring.