The yeast isn't just different between villages, it's different from street to street. Wild yeast is everywhere, and very different from place to place. To my

The yeast isn't just different between villages, it's different from street to street. Wild yeast is everywhere, and very different from place to place. To my understanding a little jar of one culture stands no chance against the evolutionary pressures outside it, so within a week or two an imported starter will return to whatever yeast exist in that specific area. Trading across villages would be a really good way to keep 'new' flavours coming in :)