When collecting resources, you collect one of your choice from the Alchemist's region.
It means that if the Alchemist is present/still in the game, then he/she will get a mana, food or ore not matter where he/she is, which means the region doesn't matter for the Alchemist anymore.
And Lv2 just gives you two rather than one. So you can choose what to gain for two times.
I do think that Gamelyn really does a great job in making those abilities relate the most to the occupations.