Published online by Cambridge University Press: 12 August 2009
Background
The field of paleoanthropology has traditionally concentrated on the adult form of our fossil predecessors. This work has led to detailed insights in the fields of phylogeny, biomechanics, function, and environmental interactions, and has made enormous contributions to our understanding of hominid adaptation and evolution. There are many reasons for concentrating on adult morphology. First, most of the preserved fossils are adult individuals. Second, the adult form is relatively stable over many years of an individual's life, and thus represents a manifestation of the many evolutionary pressures acting on a particular individual and other members of the taxon. Lastly, there has been historical bias against the study of juvenile individuals (Johnston, 1968; Johnston & Schell, 1979; Johnston & Zimmer, 1989).
However, even the most detailed understanding of the adult form still gives an incomplete picture of the adaptation and evolution of our hominid predecessors. There are many reasons that the study of adult individuals alone is not sufficient. First, humans have a life-history pattern that includes a relatively (and absolutely) long juvenile period. Thus, if typical life expectancy among our recent hominid predecessors was only three or four decades (e.g., Bermúdez de Castro & Nicolas, 1997; Trinkaus, 1995; Trinkaus & Tompkins, 1990), less than half of the total life span of a typical individual would have been spent as an adult.
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