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Allometric Approaches to the Evolution of the Primate Nervous System

  • R. D. Martin

Abstract

Both reconstruction of phylogenetic relationships between organisms and the related exercise of classification depend on assessment of similarities and differences. These undertakings are complicated by the fact that the organisms compared may differ (perhaps considerably) in body size. Maintenance of any functional constancy in species spanning a range of body sizes often obliges other features to change in a systematic nonlinear fashion with body size (allometry) (e.g., Gould, 1966, 1975a,b; Huxley, 1932; Jerison, 1973, 1977; Martin, 1975, 1979, 1980; McMahon, 1973; Radinsky, 1967; Schmidt-Nielsen, 1970, 1972; Stahl, 1962, 1963, 1967; Stephan, 1972). Most dimensional characters do not vary in direct proportion to body size (isometry), and brain size in vertebrates generally does not increase in simple proportion with increasing body size. Instead, the ratio of brain size to body size decreases systematically with increasing body size within any given taxonomic group (negative allometry). Such “scaling” of brain size to fit any given body size appears to follow a biological law to maintain some functional constancy and is, therefore, broadly predictable. Thus, whenever we conduct comparisons between organisms of different body sizes, we must take into account any recognizable biological laws governing the scaling of characters to body size.

Keywords

Body Size Major Axis Basal Metabolic Rate Brain Size Functional Scaling 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • R. D. Martin
    • 1
  1. 1.Department of AnthropologyUniversity CollegeLondon WCIEngland

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