| Records |
| Author |
Potts, R. |
| Title |
Variability selection in hominid evolution |
Type |
Journal Article |
| Year |
1998 |
Publication |
Evolutionary Anthropology: Issues, News, and Reviews |
Abbreviated Journal |
Evol. Anthropol. |
| Volume |
7 |
Issue |
3 |
Pages |
81-96 |
| Keywords |
variability selection; hominids; environment; adaptation; natural selection; evolution |
| Abstract |
Variability selection (abbreviated as VS) is a process considered to link adaptive change to large degrees of environment variability. Its application to hominid evolution is based, in part, on the pronounced rise in environmental remodeling that took place over the past several million years. The VS hypothesis differs from prior views of hominid evolution, which stress the consistent selective effects associated with specific habitats or directional trends (e.g., woodland, savanna expansion, cooling). According to the VS hypothesis, wide fluctuations over time created a growing disparity in adaptive conditions. Inconsistency in selection eventually caused habitat-specific adaptations to be replaced by structures and behaviors responsive to complex environmental change. Key hominid adaptations, in fact, emerged during times of heightened variability. Early bipedality, encephalized brains, and complex human sociality appear to signify a sequence of VS adaptations—i.e., a ratcheting up of versatility and responsiveness to novel environments experienced over the past 6 million years. The adaptive results of VS cannot be extrapolated from selection within a single environmental shift or relatively stable habitat. If some complex traits indeed require disparities in adaptive setting (and relative fitness) in order to evolve, the VS idea counters the prevailing view that adaptive change necessitates long-term, directional consistency in selection. © 1998 Wiley-Liss, Inc. |
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| Publisher |
John Wiley & Sons, Inc. |
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Edition |
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ISSN  |
1520-6505 |
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| Notes |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5461 |
| Permanent link to this record |
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| Author |
Hopkins, W.D.; Parr, L.A. |
| Title |
Lateralized behavior and lymphocyte counts in chimpanzees (pan troglodytes): A cross-sectional and longitudinal assessment |
Type |
Journal Article |
| Year |
1998 |
Publication |
Developmental Neuropsychology |
Abbreviated Journal |
Developmental Neuropsychology |
| Volume |
14 |
Issue |
4 |
Pages |
519-533 |
| Keywords |
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| Abstract |
Cross?sectional and longitudinal assessment of lymphocyte count and behavioral laterality was examined in a sample of captive chimpanzees (Pan troglodytes) to assess the validity of the Geschwind?Behan?Galaburda (GBG) theory of cerebral lateralization. For the cross?sectional analysis, chimpanzees classified as right?handed for feeding exhibited lower lymphocyte counts than chimpanzees classified as either ambiguously handed or left?handed. Longitudinal analysis indicated that some measures of laterality within the first 3 months of life predicted (a) direction of hand preference at 2 to 5 years of age and (b) lymphocyte counts for the first 3 years of life. The association between lymphocyte count and behavioral laterality was more evident in males than females. Taken together, the results support some aspects of the GBG theory. |
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Thesis |
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| Publisher |
Routledge |
Place of Publication |
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| ISSN |
8756-5641 |
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| Notes |
doi: 10.1080/87565649809540726 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5780 |
| Permanent link to this record |
