Periodic catastrophes over human evolutionary history are necessary to explain the forager population paradox
Proceedings of the National Academy of Sciences of the United States of America • Vol/Iss. 116(26) • PNAS • • Published In • Pages: 12758-12766 •
By Gurven, Michael D., Davison, Raziel J.
Hypothesis
Combining more than one of the four demographic scenarios (altered mean vital rates (i.e., fertility and mortality), vital rate stochasticity, vital rate covariance, and periodic catastrophes) increases the likelihood of returning the rate of population growth to ZPG p. 12763.
Note
When only adult mortality increases, lower variance and covariance could generate ZPG. The most effective and reasonable combination to generate ZPG is catastrophes plus altered mean vital rates
| Test Name | Support | Significance | Coefficient | Tail |
|---|---|---|---|---|
| UNKNOWN | Supported | UNKNOWN | UNKNOWN | UNKNOWN |
| Variable Name | Variable Type | OCM Term(s) |
|---|---|---|
| Population Growth | Dependent | Population |
| Vital rate stochasticity | Independent | Birth Statistics, Morbidity |
| Vital rate covariance | Independent | Birth Statistics, Morbidity |
| Catastrophes | Independent | Disasters |
| Vital rates (fertility/mortality) | Independent | Birth Statistics, Morbidity |