Changing climates as a cause is theoretically possible, but considering that there are other time-varying causes relating to gene-culture co-evolution and migrations, it is pretty difficult to test. However, looking just at latitude patterns with a control for year is a simple test. I already looked in the entire Reich dataset and found this was supported. The dataset is larger now, so a new examination should be done.
The Molecular Genetics of Cold Winters Theory
Changing climates as a cause is theoretically possible, but considering that there are other time-varying causes relating to gene-culture co-evolution and migrations, it is pretty difficult to test. However, looking just at latitude patterns with a control for year is a simple test. I already looked in the entire Reich dataset and found this was supported. The dataset is larger now, so a new examination should be done.
May be of interest: https://heliconian.substack.com/