Hominoid intraspecific cranial variation mirrors neutral genetic diversity
| Autor: | Michael E. Steiper, Kieran P. McNulty, Julia M. Zichello, Christopher J. Raxworthy, Karen L. Baab |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Gene Flow Male Population Population genetics Biology Extinction Biological 010603 evolutionary biology 01 natural sciences Intraspecific competition hominin fossil record 03 medical and health sciences Genetic drift stomatognathic system Genetic variation Animals extant ape variation Selection Genetic education History Ancient Phylogeny education.field_of_study Genetic diversity Multidisciplinary Natural selection Fossils Genetic Drift Skull population genetics Genetic Variation Hominidae respiratory system Biological Sciences Biological Evolution hominoid evolution 030104 developmental biology Genetics Population Homo sapiens Evolutionary biology Anthropology Female human activities cranial shape variation |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America |
| ISSN: | 1091-6490 0027-8424 |
| Popis: | Significance In humans, patterns of cranial variation mirror genetic diversity globally, implicating population history as a key driver of cranial disparity. Here, we demonstrate that the magnitude of genetic diversity within 12 extant ape taxa explains a large proportion of cranial shape variation. Taxa that are more genetically diverse tend to be more cranially diverse also. Our results suggest that neutral evolutionary processes such as mutation, genetic drift, and gene flow are reflected in both genetic and cranial diversity in apes. This work provides a perspective on intraspecific cranial variation in apes which has important implications for interpreting selective and developmental pressures on the cranium and for understanding shape variation in fossil hominin crania. Natural selection, developmental constraint, and plasticity have all been invoked as explanations for intraspecific cranial variation in humans and apes. However, global patterns of human cranial variation are congruent with patterns of genetic variation, demonstrating that population history has influenced cranial variation in humans. Here we show that this finding is not unique to Homo sapiens but is also broadly evident across extant ape species. Specifically, taxa that exhibit greater intraspecific cranial shape variation also exhibit greater genetic diversity at neutral autosomal loci. Thus, cranial shape variation within hominoid taxa reflects the population history of each species. Our results suggest that neutral evolutionary processes such as mutation, gene flow, and genetic drift have played an important role in generating cranial variation within species. These findings are consistent with previous work on human cranial morphology and improve our understanding of the evolutionary processes that generate intraspecific cranial shape diversity within hominoids. This work has implications for the analysis of selective and developmental pressures on the cranium and for interpreting shape variation in fossil hominin crania. |
| Databáze: | OpenAIRE |
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