BTW, I was just browsing JSTOR and saw this: Life history, habitat saturation and the evolution of fecundity and survival altruism. S. Lion and S. Gandon, Evolution, v. 64 n. 6 (2010), pp. 1594-1606. If you would like to, I could relate the substance (it is a tiny bit inconvenient for me to do right now, or I would have.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.