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      Ontogeny and phylogeny in papionin primates.

        1 , ,
      Journal of human evolution

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          Abstract

          This study investigates the developmental bases of size and shape variation in papionin primates (Macaca, Cercocebus, Mandrillus, Lophocebus, and Papio). The analysis tests hypotheses predicting that heterochronic changes in ontogeny, particularly in the degree of overall size growth, can account for cranial diversity and "allometric scaling" in this clade. Large developmental samples of extant papionin crania are examined to test heterochronic hypotheses using bivariate allometric methods. Analyses indicate that the crania of larger papionins (Mandrillus and Papio) are generally peramorphic, surpassing size and shape ranges of smaller, and probably less-derived, macaques and mangabeys. At least two heterochronic processes, including acceleration and hypermorphosis, can account for this pattern. Ontogenetic changes include decoupling of growth and development among cranial regions, along with simple shifts in size. Allometric scaling has complex developmental bases. Size change itself is not sufficient to explain all developmental differences among papionins, but these changes are extremely important in comparisons within cranial regions such as the face. Results imply that Papio exhibits strongly derived patterns of brain growth that impact postnatal patterns of size and shape transformation. Consideration of these results in the context of recent socioecological analyses suggests that derived patterns of cranial growth in Papio may be a response to selection during the early periods of ontogeny, resulting in a distinctive life history pattern.

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          Author and article information

          Journal
          J. Hum. Evol.
          Journal of human evolution
          0047-2484
          0047-2484
          Oct 2003
          : 45
          : 4
          Affiliations
          [1 ] Department of Anthropology, 109 Davenport Hall, University of Illinois, Urbana, IL 61801, USA. sleigh@uiuc.edu
          Article
          S0047248403001180
          10.1016/j.jhevol.2003.08.004
          14585244
          87f7cc8d-d95f-4cbc-9445-53eb35ff9b2c
          History

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