Re: Hip-knee-ankle joints on 1 line (Re: A.afarensis: same dietthrough time & in diverse paleo-ecol.conditions

On Dec 11, 12:32 am, Marc Verhaegen <m_verhae...@xxxxxxxxx> wrote:
Op 11-12-2007 02:01, in artikel
f0e974f7-bc9a-4166-adbc-25a6cead0...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, Lee Olsen
<paleoc...@xxxxxxxxxxx> schreef:

On Dec 10, 9:00 am, Marc Verhaegen <m_verhae...@xxxxxxxxx> wrote:
More irrelevant lip service.

What??

The real question is how early Homo evolved endurant bipedalism on
the savanna.

:-D
You're cray: Man is the opposite of a savanna inhabitant. Humans lack
sun-reflecting fur (4) but have thermo-insulative subcutaneous fat layers,
which are never seen in savanna mammals. We have a water- and sodium-wasting
cooling system of abundant sweat glands, totally unfit for a dry environment
(5). Our maximal urine concentration is much too low for a savanna-dwelling
mammal (6). We need much more water than other primates, and have to drink
more often than savanna inhabitants, yet we cannot drink large quantities at
a time (7-8).

"However, the tortoise bones and ostrich-egg fragments are more
closely associated with the
lithic artifacts; their systematic presents in both Lokalalie sites
may show a possible hominid
collecting strategy (Roche 1999)."

Know what an ostrich is? Clue: it is not a seabird and they love
heat.

http://www.naturalhistorymag.com/master.html?http://www.naturalhistorymag.com/1206/1206_samplings.html
"In fact, Australian Aborigines and various Native American and
African groups have traditionally practiced "persistence hunting,"
chasing antelopes or other game in the midday heat, often for hours,
until the animals overheat and collapse."



Holger Preuschoft 2004
Mechanisms for the acquisition of habitual bipedality:
are there biomechanical reasons for the acquisition of
upright bipedal posture?
J. Anat. 204 pp363-384
"Five divergent locomotor/morphological types have
evolved from this base: arm-swinging in gibbons, forelimb-dominated
slow climbing in orang-utans, quadrupedalism/
climbing in the African apes, an unknown mix of climbing and
bipedal walking in australopithecines, and the remarkably
endurant bipedal walking of humans."

Yes, vertical posture was probably already 20 Ma: Moroto lumbar vertebra,
possibly predating the greater/less ape split c.18 Ma or so.

Clue: Vertical is not the same as endurant.


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
"Our hypothesis that there is a direct relationship between the
acquisition of modern postcranial proportions and increased
ranging/transport distances at around 1.8-1.5 Ma appears
to be borne out, although other selective factors, such
as thermoregulatory influences (see Ruff, 1991; Wheeler,
1992) and adaptations for throwing (see Dunsworth
et al. 2003), are likely to have played an important
(although probably interdependent) role."

Typical savanna blabla: the hominoid LCA was probably already vertical >18
Ma, see A.Filler 2007.

Clue: Vertical is not the same as endurant.
Do you walk the same as >18 Ma?????



Gorillas & chimps & even baboons etc.are excellent throwers.

With some accuracy, but no force. Not so with Homo:
Barbara Isaac 1987
Throwing and human evolution
The African Archaeological Review, 5, pp. 3-17

Page 9: Record cricket ball toss is 129 meters.
Let's see a chimp do that.

page 13: "Prehistorians have long puzzled over how the apparently
vulnerable
naked ape was able to survive in the African savanna without even the
benefit
of large canines such as sported by male baboons and chimpanzees
(Washburn and Moore 1080:76). Lorna Marshall (pers. comm.) saw a small
group
of Bushmen clearing lions from a kill by throwing clods of earth."



About Wheeler: Accounts of how our Plio-Pleistocene ancestors may have lived
on the savannah include bouts of strenuous activity outside the gallery
forest for hunting or digging (Hanna & Brown 1983, but see Newman 1970);
dogged pursuit of swifter animals over one or two days (Carrier, 1984); and
bipedal trekking after migrating herds of savannah ungulates (Sinclair
cs.1986).

Thanks, I'm sure Mr. Karoha will agree.

Some of the even more imaginative versions appear mutually
contradictory. For example, the hypothesis of a foraging or hunting male
accords ill with the meridian theory of Wheeler that our ancestors became
bipedal to minimise direct solar radiation at midday and retained a hairy
heat shield only on top of the head (1984, 1988 in imitation of DHK Lee in
Newman 1970, and in Schmidt-Nielsen 1974:89). If we accept this reasoning,
it must have been the women who ranged over the plains at noon while the
balding and bearded males rested in the shade. :-D

Any SC fat on top your head? If we accept this reasoning, men never
were divers.



This of course confirms nicely with back ache evidence by Filler.

Yes, of course.

Hauling tons of rock around the savanna,

:-DDD

Why do you laugh at yourself?

http://www.indiana.edu/~origins/images/Olorg.Catwalk.gif

Isaac 1977:44 "DE/89 B. Clearly the occurrence gives evidence that the
hominds
responsible carried at least one or two tons of stone to this
vicinity."

Think I would kid you?



Isaac (1977) and Potts
(2004), would be enough to give anyone back pain.
A ARON G. FILLER 2007
Emergence and optimization of upright
posture among hominiform hominoids
and the evolutionary pathophysiology of
back pain
Neurosurg. Focus / Volume 23 / July

Yes, that's one of the papers of Filler I meant.
Thanks, little boy, but read also his book & PLoS paper.

Yes doughboy, I would rather have a back ache than be a dead kudu!
.

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