As their territories were generally unfavourable to the support of concentrated populations, the Apacheans tended to reside in dispersed groups.
In addition, there was often a sense that a city should have a high density of concentrated populations at their core, in which that density was focused on a particular religious or administrative purpose such as a palace or temple".
In a limited area of marshy land that fostered concentrated populations, an unusual number of rich urban centers grew up in the 17th century — places with still resonant names like The Hague, Amsterdam, Haarlem and Delft.
It flourishes in cold weather — last November was the coldest on record, Mr. Aldrich said — and rapidly spreads when there are concentrated populations of birds with diminished food resources.
Vertical urban farming is one solution to increasing food production, with the double win of increasing crop yields without increasing land use and moving food closer to the concentrated populations that need it.
Population density was relatively light; mountain regions were occupied only in summer, but there were locally concentrated populations centred on such large oases as Tashkent, Samarkand, Kashi (Kashgar), and Ürümqi (Urumchi), with smaller groupings around lesser sources of water.
