Re: apiths = chimp & gorilla relatives

Andrew Nowicki wrote:
> Andrew Nowicki wrote:
>
> > If the Apiths are not the ancestors of Homo, then
> > we have to explain why we could not find any bones
> > of Homo ancestors.
>
> Marc Verhaegen wrote:
>
> > But we find fossil Homo (rudolfensis) from probably
> > at least c 2.4 Ma (not so long after the H/P split).
>
> Very long ago. Your own article states:
> "Asian pongids (orangutans) and African hominids
> (gorillas, chimpanzees and humans) split 14-10
> million years ago,"
>
> We are talking about total absence of evidence.
> Not a splinter of a tooth!
>
> Marc Verhaegen wrote:
>
> > And of Orrorin c 6 Ma it's impossible to say whether it belong
> > to H or to P. Besides, retroviral data suggest H might have
> > been absent from Africa between 4 & 3 Ma (CT Yohn cs.2005
> > "Lineage-Specific Expansions of Retroviral Insertions within
> > the Genomes of African Great Apes but Not Humans and Orangutans"
> > PLoS Biol.3:1-11).
>
> You add more question marks, but you cannot build
> a hypothesis on question marks only.

Marc can, but then again Marc is not a scientist.




You must have
> some arguments supporting your hypothesis.


He has support, it's called imagination.


>
> Andrew Nowicki wrote:
>
> > It is much easier to explain the big difference
> > between the bones of Homo and the Apiths. Homo
> > was a bipedal runner...
>
> Marc Verhaegen wrote:
>
> > ??
> > Certainly not: erectus had much thicker bones than all other
> > primates, living & extinct...
>
> A picture of postcranial Homo erectus skeleton from
> Nariokotome, Kenya looks like modern human skeleton
> with a fairly robust pelvis. Its bones are not massive
> enough to seriously impede bipedal running. I have
> thick bones and yet I ran well when I was younger.
> My skeleton and my biography suggest that thick bones
> are the adaptation to hauling heavy loads.


"However, walking erect, the Nariotome could have carried loads of
10-15% body mass for less cost, relative to body size, than AL 288-1
walking erect but unloaded. In fact, to the extent that our sample of
humans is typical, KNM-WR 15000 would have had better mechanical
effectiveness in bearing light loads on the back than modern human
adults."

W.-J. Wang and R. H. Crompton 2004
The role of load-carrying in the evolution of modern body
proportions. J.Anat. 204, pp417-430

These authors also point out that at the same time rock hauling
distance increased in the archaeological record.
Olduvai Bed 1 = 3-12 km
East Turkana = 20 km
Ologorgesailie = 40 km
Gadeb = 100 km

Isaac (1977) site DE/89 tons of rock hauled in.
>
> I still believe that erectus was a bipedal runner.


http://tinyurl.com/7u5wo
"In fact, he walked and ran with better mechanics than we do today. The
mechanics of his femur, femur head, pelvis, and lower back are superior
to those of today."

"Two indepandent lines of research converged on the conclusion that
early Homo was an efficient runner, the first human species to be so
(Leakey 1994:55)."





> Male size was about 1.8 meters and 63 kilograms;
> females 1.6 meters and 53 kilograms. Modern humans
> have similar height and weight.
>
> PS. The pace of the evolution is not constant.
> Sometimes it preserves living fossils. Sometimes
> it jumps. Spear hunting was a revolutionary skill
> that almost instantly transformed our ancestors.

.

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