4.3 Article

Ontogenetic changes in magnitudes of integration in the macaque skull

Journal

AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY
Volume 174, Issue 1, Pages 76-88

Publisher

WILEY
DOI: 10.1002/ajpa.24119

Keywords

integration coefficient of variation; Macaca fascicularis; morphological integration; ontogeny; skull modules

Funding

  1. National Science Foundation [BCS 1830745]
  2. SUNY Research Foundation

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The study analyzed the magnitude of integration in the skull of Macaca fascicularis throughout ontogeny. Results showed that most skull modules were more tightly integrated than the skull as a whole. However, there were exceptions in certain modules, reflecting the influences of early brain growth/development and changing functional demands. The relationship between evolutionary flexibility and developmental/functional mechanisms was complex due to the skull's multifunctionality and various ossification origins.
Objectives Magnitudes of morphological integration may constrain or facilitate craniofacial shape variation. The aim of this study was to analyze how the magnitude of integration in the skull ofMacaca fascicularischanges throughout ontogeny in relation to developmental and/or functional modules. Materials and methods Geometric morphometric methods were used to analyze the magnitude of integration in the macaque cranium and mandible in 80 juvenile and 40 adultM. fascicularisspecimens. Integration scores in skull modules were calculated using integration coefficient of variation (ICV) of eigenvalues based on a resampling procedure. Resultant ICV scores between the skull as a whole, and developmental and/or functional modules were compared using Mann-WhitneyUtests. Results Results showed that most skull modules were more tightly integrated than the skull as a whole, with the exception of the chondrocranium in juveniles without canines, the chondrocranium/face complex and the mandibular corpus in adults, and the mandibular ramus in all juveniles. The chondrocranium/face and face/mandibular corpus complexes were more tightly integrated in juveniles than adults, possibly reflecting the influences of early brain growth/development, and the changing functional demands of infant suckling and later masticatory loading. This is also supported by the much higher integration of the mandibular ramus in adults compared with juveniles. Discussion Magnitudes of integration in skull modules reflect developmental/functional mechanisms inM. fascicularis. However, the relationship between evolutionary flexibility and developmental/functional mechanisms was not direct or simple, likely because of the complex morphology, multifunctionality, and various ossification origins of the skull.

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