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Related Experiment Videos

Integration, phylogeny, and the hominid cranial base.

D S Strait1

  • 1Doctoral Program in Anthropological Sciences, State University of New York, Stony Brook, New York 11794-4364, USA. dstrait@iris.nyit.edu

American Journal of Physical Anthropology
|March 29, 2001
PubMed
Summary

Morphological integration in basicranial features significantly impacts primate and hominid phylogenetic analyses. Accounting for integrated traits, rather than treating them as independent, refines evolutionary relationships and avoids analytical bias.

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Area of Science:

  • Paleoanthropology
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • Phylogenetic analyses often assume character independence, potentially overlooking complex evolutionary relationships.
  • Basicranial morphology in catarrhine primates and early hominids provides a unique dataset for investigating character integration.
  • Understanding morphological integration is crucial for accurate reconstruction of evolutionary histories.

Purpose of the Study:

  • To assess the impact of morphological integration on phylogenetic analyses of early hominids.
  • To determine if basicranial features exhibit functional or structural relationships that violate phylogenetic independence.
  • To integrate findings on morphological integration into cladistic analyses for improved accuracy.

Main Methods:

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  • Factor analysis was employed to test hypotheses about functional and structural relationships among basicranial characters.
  • Characters identified as integrated were grouped into complexes and treated as single units in cladistic analysis.
  • Cladistic analyses were performed on early hominid data, comparing results with and without accounting for integration.

    • Main Results:

    • Factor analysis suggested potential structural relationships between five basicranial features and relative brain size in hominoids.
    • The degree of morphological integration varied, with some characters potentially integrated while others remained independent.
    • Treating integrated features as complexes significantly altered the phylogenetic placement of *Australopithecus africanus*.

    Conclusions:

    • Morphological integration patterns must be carefully considered in all morphology-based cladistic analyses.
    • Failure to account for integration can bias phylogenetic reconstructions, as seen in analyses of early hominids.
    • Hypotheses of integration require rigorous testing before being applied in phylogenetic analyses to avoid introducing new biases.