Growing up slowly 160,000 years ago

Dean, Christopher

doi:10.1073/pnas.0701317104

Cited by 18 publications

(9 citation statements)

References 16 publications

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“…Support for the latter hypothesis comes from a comparative analysis of size-independent morphological markers of femoral maturation [125], which reports features in Nariokotome that are characteristic of modern humans after the growth spurt. In any case, the current evidence indicates that H. erectus had a somatic growth trajectory more similar to chimpanzees than to modern humans [18,66], but that he nevertheless attained body sizes in the range of modern humans.…”

Section: Evolution Of Hominin Somatic Ontogenymentioning

confidence: 88%

“…erectus boy from Nariokotome, Tanzania, who reached an age of 8-9y [65,66], and a partial skeleton of an adolescent H. erectus from Dmanisi, Georgia, aged between 11 and 13y [67,68]. Australopithecine youth are represented by the iconic A. africanus infant from Taung, South Africa, with an estimated age at death of 3-4y [3], and a virtually complete skeleton of a similar-aged A. afarensis infant from Dikika, Ethiopia [69].…”

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confidence: 99%

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The evolution of hominin ontogenies

Zollikofer

León

2010

Seminars in Cell & Developmental Biology

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Since the beginnings of paleoanthropology, immature fossil hominin specimens have marked important but highly contested cornerstones of research. Long deemed as not representative of a fossil species' morphology, immature hominins are now in the center of scientific attention, and an increasing interest in evolutionary developmental questions has made developmental paleoanthropology a vibrant field of research. Here we report on recent advances in this field, which result from a combination of new methods to reconstruct fossil ontogenies with insights from evo-devo research on extant species.

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Section: Evolution Of Hominin Somatic Ontogenymentioning

confidence: 88%

mentioning

confidence: 99%

The evolution of hominin ontogenies

Zollikofer

León

2010

Seminars in Cell & Developmental Biology

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“…2 Finally, there is a problem with Dubreuil's assertion that cooperative feeding and breeding evolved separately. The evidence Dubreuil presents for thinking this was a two part process is tenuous at best: the fossil evidence such as that from teeth (Dean 2007) suggests that the introduction of these two features of human social life was a gradual process, starting with Homo erectus. Large game hunting and sharing patterns were probably not present until at least the common ancestor of Neanderthals and modern humans, and fully modern life histories not present in any species except modern Homo sapiens (not even in Neanderthals) (Smith et al 2010(Smith et al , 2007.…”

Section: Hierarchies Lostmentioning

confidence: 97%

Evolution and the loss of hierarchies: Dubreuil’s “Human evolution and the origin of hierarchies: the state of nature”

Driscoll

2011

Biol Philos

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“…The basic method to reconstruct periodicity of stress episodes, in the form of LEH, is simply to count normal incremental features-perikymata-between LEH and then to convert these counts into intervals of time based on the published reports of the number of days required to form one perikyma (AKA "long period incremental markings" (Dean, 2007)). As far as we know, the periodicity of perikymata is invariant among teeth from a single individual.…”

Section: Predictionsmentioning

confidence: 99%

Variation in perikymata counts between repetitive episodes of linear enamel hypoplasia among orangutans from Sumatra and Borneo

Skinner

2014

American J Phys Anthropol

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The goal of this study is to evaluate whether repetitive linear enamel hypoplasia (rLEH) in apes is ecologically informative. LEH, which appears as grooves of thinner enamel often caused by malnutrition and/or disease, is a permanent record of departures from developmental homeostasis in infant and juvenile apes. Orangutans were selected for the study as they are a threatened species, have a remarkably high prevalence of rLEH, and because Sumatra is deemed a better habitat for orangutans than is Borneo, facilitating an ecological comparison. Objectives are to determine: a) whether periodicity of rLEH in orangutans corresponds to monsoon-mediated cycles in precipitation or food; and b) whether patterning of rLEH supports the view that Borneo is an inferior habitat. This study compares the counts of perikymata between adjacent LEH from 9 Sumatran and 26 Bornean orangutans to estimate the periodicity of rLEH. A total of 131 nonredundant inter-LEH perikymata counts were transformed to natural log values to reveal clusters of counts in a multiplicative series. Using a value of 10 days to form one perikyma, rLEH tends to recur semiannually in both populations. However, Sumatran orangutans show significantly fewer semiannual intervals and more annually recurring episodes. Bornean orangutans show mostly semiannual intervals and are more variable in inter-LEH perikymata counts. It is concluded that: a) developmental conditions for infant orangutans in Sumatra protect them somewhat from seasonal and environmental variation; b) temporal patterning of rLEH indicates that Borneo is the poorer habitat for orangutans; and c) the study of rLEH can be ecologically informative.

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Growing up slowly 160,000 years ago

Cited by 18 publications

References 16 publications

The evolution of hominin ontogenies

The evolution of hominin ontogenies

Evolution and the loss of hierarchies: Dubreuil’s “Human evolution and the origin of hierarchies: the state of nature”

Variation in perikymata counts between repetitive episodes of linear enamel hypoplasia among orangutans from Sumatra and Borneo

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