Chesson's index
Chesson's Index refers to an index of feeding selectivity described by Jean Chesson in the early 1980's[1]. The use of this index has been widespread with more than 400 citations in the scientific literature[2]. In short, this index is intended to show whether a preference for a food item or resource exists by comparing the availability and use of that food item.
1 Chesson, J. 1983. The Estimation and Analysis of Preference and Its Relatioship to Foraging Models. Ecology. 64 (5): 1297-1304.
2 ISI Web of Science Search 5 Feb 2009