Dark Enlightenment bloggers talk about R vs. K selection quite a bit. I found this video by Bozeman Science (unaffiliated with atavisionary.com) and thought it was worth sharing:
Though compared to other species, all humans are very k selected, humans do vary with respect to other in their level of r or k selection. Someone who has four kids and spends the bare minimum on raising them and doesn’t help them with university would be considered r selected by human standards. Someone else who only has one or two and invests heavily in providing them the best education and opportunities would be considered k selected.