Re: Bone density in mustelids

On Dec 2, 4:36 pm, Marc Verhaegen <m_verhae...@xxxxxxxxx> wrote:
FE Fish & BR Stein 1991 Zoomorphol.110:339-345
Functional correlates of differences in bone density among terrestrial and
aquatic genera in the family Mustelidae (Mammalia)

"the costs of maintaining an increased skeletal mass increases according to
locomotor function as follows : swimmers, sedentary forms, slow runners,
fast runners, and flyers"
No reason why erectus must be an exception, IOW, the H.erectus endurance
running hypothesis is pure nonsense.

Of course the fallacy in wet ape thinking is that Homo e has to run as
fast as a today's
marathon runners to catch a kudu, when in fact one does not. Nor does
one have to
run fast to catch a tortoise.

For example:

Message-ID: <1190731620.305206.244870@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 25 Sep 2007 07:47:00 -0700
Marc: "How fast does he run? 30 km/hr?"

Lee: "Goodness no. Only takes 7.5 km/hr (read slow) to run down a
savanna adapted kudu
in the heat of the day. Why sprint and burn yourself out when you can
trot?"
Marc does not understand any more about running than he does about
mountain beavers.

http://www.chimpcollaboratory.org/news/run.asp
"From our spring-loaded ligaments to our muscular behinds to our
ability to sweat, the human
body took the ideal shape of a long-distance runner starting some 2
million years ago, the researchers say.
The long, lean build helped us scavenge widely scattered kills and
could also have been an
advantage when hunting down prey over long distances."

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."

http://www.newscientist.com/article/dn12381-duplicate-genes-help-huma...
July 2007
Human beings can run long distances because we carry multiple copies
of a gene
that helps supply our cells with energy, a new study suggests. That
supports
the idea that endurance running gave our human ancestors an
evolutionary edge.

http://www.newscientist.com/article/dn12381-duplicate-genes-help-huma...
"Human beings can run long distances because we carry multiple copies
of a gene
that helps supply our cells with energy, a new study suggests. That
supports
the idea that endurance running gave our human ancestors an
evolutionary edge."

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."


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

http://www.mnh.si.edu/anthro/humanorigins/ha/WT15k.html
"The hips were more slender and adapted to walking and running over
long distances."


http://news.bbc.co.uk/cbbcnews/hi/animals/newsid_1804000/1804830.stm
Man beats horse in 50 mile desert race



"The use of counterweights by human divers helps to speed descent and
to avoid swimming efforts (Hong & Rahn 1967). High limb-bone density in sea
otters could be metabolically advantageous by reducing energy costs during
submersion until buoyancy could be altered by compression of the lungs with
increased depth. This effect is compounded by a 41% reduction in the
metabolic cost of swimming in sea otters when submerged as compared to their
surface swimming (Williams 1989). In diving ducks, 95% of the work performed
during a dive is needed merely to overcome buoyancy (Stephenson et al.1989).
The increased ballast provided by the generally denser limb bones in sea
otters also could aid in stabilization when the animal is submerged. The sea
otter¹s habit of foraging OE the bottom for benthic invertebrates,
especially abalone, requires it to maintain a stable attitude as abalone
must be worked off the substrate by prying or bludgeoning the mollusk with a
rock (Chanin 1985). The higher bone densities (Table 1) recorded for both
anterior and posterior distal elements in this species would lower the
position of its center of mass, thereby increasing stability.argued that an
increase in limb-bone density in this species actually might prove
disadvantageous."

H.erectus dispersed to Java, Flores etc.along seacoasts, they used stones &
shells to butcher stranded whales & bovids, no reason why they would not
have dived for shellfish. There's not the slightest reason why humans &
their relatives must be different from all other animals in this respect,
but some PAs still prefer to "explain" pachyostosis & osteosclerosis in
H.erectus skulls & limb bones by far-fetched stories: liver eating, head
banging, honey consumption, thyroid or parathyroid hypo- or hyperfunction,
metabolic diseases & other just-so "explanations". Incredible.

.

Relevant Pages

  • Re: Bone density in mustelids
    ... Functional correlates of differences in bone density among terrestrial and ... "the costs of maintaining an increased skeletal mass increases according to ... High limb-bone density in sea ... The increased ballast provided by the generally denser limb bones in sea ...
    (sci.anthropology.paleo)
  • Bone density in mustelids
    ... Functional correlates of differences in bone density among terrestrial and ... "the costs of maintaining an increased skeletal mass increases according to ... High limb-bone density in sea ... The increased ballast provided by the generally denser limb bones in sea ...
    (sci.anthropology.paleo)
  • Re: ...and thats why Rodriguez should not be considered for MVP
    ... >> called strike three with runners on first and third. ... >> clutch players make their bones and Arod's bones are brittle. ... Where would you rank Arod in that situation? ...
    (alt.sports.baseball.ny-yankees)
  • Re: only fools believe erectus couldnt run run (Re: Marc Contradicts Himself Again Re: butchering s
    ... >> arm bones, that runners have heavier leg bones that people who sit on a ... >> evidence: ...
    (sci.anthropology.paleo)
  • Re: ...and thats why Rodriguez should not be considered for MVP
    ... > called strike three with runners on first and third. ... > clutch players make their bones and Arod's bones are brittle. ... Where would you rank Arod in that situation? ...
    (alt.sports.baseball.ny-yankees)
Loading