Deer, drought, and warfare: Managing risk in the central Illinois river valley (CIRV) from the eleventh through fourteenth centuries

Abstract

We investigated how Mississippian residents of the Central Illinois River Valley (CIRV) altered their hunting strategies in response to climate change and warfare in the 13th and 14th centuries. The CIRV, located in west-central Illinois just north of Greater Cahokia, was characterized by optimal climatic conditions in the 11th and 12th centuries, followed by centuries of drought and warfare. We integrated paleoclimatic reconstructions and evidence of violence with bone collagen and apatite isotopic analyses on white-tailed deer remains to investigate how CIRV residents minimized risks associated with white-tailed deer hunting. This is the first study in this region to effectively use δ13Capatite measurements to show the selective consumption of maize by white-tailed deer. Our results indicate that there were varied responses to climate change and conflict that were socially contingent upon community size. Notably, deer hunted by residents of Roskamp, occupied in the 13th century during the period of warfare, had highly elevated δ13Capatite values, demonstrating residents partook in garden hunting.