Ecological Prelude to the Black Death in Central Asia (Early 14th Century)

Timeline

1. 1301–1304Northern Tien Shan steppe · Northern Tien ShanClimate fluctuations altered steppe vegetation and rodent habitats; plague host animals such as marmots and ground squirrels expanded their populations across the Central Asian steppe belt, forming a wider space for sylvatic plague cycles and providing an ecological vehicle for the persistence of Yersinia pestis.
2. 1302–1307Kipchak Steppe and the northern edge of the Hexi Corridor · Kipchak SteppeAfter the fragmentation of the Mongol Empire, various steppe khanates coexisted; contact surfaces between nomadic populations, livestock, and wildlife expanded, and postal relay stations and military camps increased human–animal cohabitation scenarios, raising the probability of plague jumping from wildlife to commensal rats and human populations.
3. 1305–1310Central Asian segment of the Silk Road · Silk RoadRegimes such as the Yuan dynasty and the Ilkhanate kept trans-Eurasian trade routes open; postal relay stations, markets, and port cities connected the Central Asian plague foci with Persia and the Black Sea coast. Although no large-scale human plague outbreaks were yet recorded, ecological and transportation conditions had already prepared a transmission network for the plague's westward spread decades later.