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Population Affinities of the Jebel Sahaba Skeletal Sample (Holliday 2013)
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[QUOTE]Originally posted by Troll Patrol: [QB] [QUOTE]Originally posted by the lioness,: [qb] [QUOTE]Originally posted by Troll Patrol: [QB] On what page can this be found? [i]"limb proprtion can change relatively quickly, alteration of body width occurs much more slowly"[/i] - Principles of Human Evolution 2013 By Robert Andrew Foley, Roger Lewin [/QUOTE]here, http://books.google.com/books?id=dDWsTli1k54C&pg=PT203&lpg=PT203&dq=%22lim#v= not sure the page # Title of section: Complications Flowing From Population Migration ______________________________ also this you post the picture from: http://www.pnas.org/content/105/49/19348.long Temperature regulates limb length in homeotherms by directly modulating cartilage growth Maria A. Serrata,1, Donna Kingb, and C. Owen Lovejoy ( [/qb][/QUOTE]I read the page. And as suspected relative is within the timeframe of the anatomical modern human. So from that point of view 15,000-18,000 year is relative. Hence how they correlate the section with "the new world" / Amerindians. And indirectly referring to: [QUOTE]Migration within a larger time framework took place ca. 15,000–18,000 BP, when the first Asian populations crossed the Bering Strait, ultimately founding the modern Amerindian population. Despite having as much as 18,000 years of selection in environments as diverse as those found in the Old World, body mass and proportion clines in the Americas are less steep than those in the Old World (Newman, 1953; Roberts, 1978). [b]In fact, as Hulse (1960) pointed out, Amerindians, even in the tropics, tend to possess some ‘‘arctic’’ adaptations. Thus he concluded that it must take more than 15,000 years for modern humans to fully adapt to a new environment (see also Trinkaus, 1992). This suggests that body proportions tend not to be very plastic under natural conditions, and that selective rates on body shape are such that evolution in these features is long-term."[/b] [/QUOTE]- Holliday T. (1997). Body proportions in Late Pleistocene Europe and modern human origins. Jrnl Hum Evo. 32:423-447 [/QB][/QUOTE]
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