ISOTOPIC TRACKING OF CHANGE IN DIET AND HABITAT USE IN AFRICAN ELEPHANTS

The carbon, nitrogen, and strontium isotope compositions of elephants in Amboseli Park, Kenya, were measured to examine changes in diet and habitat use since the 1960s. Carbon isotope ratios, which reflect the photosynthetic pathway of food plants, record a shift in diet from tre es and shrubs to grass. Strontium isotope ratios, which reflect the ge ologic age of bedrock, document the concentration of elephants within the park. The high isotopic variability produced by behavioral and eco logical shifts, if it is representative of other East African elephant populations, may complicate the use of isotopes as indicators of the source region of ivory.