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uir so archaeological measurement of diet breadth, a key variable in many foraging theory approaches. We then examine seven ungulate assemblages from the early Upper Palaeolithic site of Le Flageolet I (Dordogne, France) in this light, and show that these assemblages incorporate distinctly diVerent relationships between numbers of specimens and numbers of taxa. While some of the diVerences involved may be caused by diVerential specimen fragmentation, the entire pattern of similarities and diVerences in richness appears to reflect changing maximum diet breadths through time.? 1998 Academic Pres