http://www.bbc.co.uk/news/science-environment-19184370
Dan manusia yang dungu- dungu kayak anjing seperti Abbas Amin, arra_s, ayub
yahya, Dipo, johny-indon, PAREWA PAREWA, Pinpin, rezameutia, Roman Proteus
safin_blanc masih saua percaya bualan orang Arab primitif penyusun khurafah
najis al-Mushaf yang membual bilang tahayul allah hasil khayalan orang Arab
primiitf itu menciptakan Adam dari tanah lihat...
Otak yagn bisa dipakai buat berfikri dan harga diri itulah yagn tidak dimiliki
Abbas Amin, arra_s, ayub yahya, Dipo, johny-indon, PAREWA PAREWA, Pinpin,
rezameutia, Roman Proteus safin_blanc itu.
Web address:
http://www.sciencedaily.com/releases/2012/08/
120808132711.htm
Early Human Ancestors Had More Variable Diet
enlarge
Scientists conducted an analysis of the fossil teeth, indicating that
Australopithecus, a predecessor of early Homo, had a more varied diet than
early Homo. (Credit: Image courtesy of University of the Witwatersrand)
ScienceDaily (Aug. 8, 2012) New research sheds more light on the diet and
home ranges of early hominins belonging to three different genera, notably
Australopithecus, Paranthropus and Homo -- that were discovered at sites such
as Sterkfontein, Swartkrans and Kromdraai in the Cradle of Humankind, about 50
kilometres from Johannesburg. Australopithecus existed before the other two
genera evolved about 2 million years ago.
Scientists conducted an analysis of the fossil teeth, indicating that
Australopithecus, a predecessor of early Homo, had a more varied diet than
early Homo. Its diet was also more variable than the diet of another distant
human relative known as Paranthropus.
An international team of researchers, including Professor Francis Thackeray,
Director of the Institute for Human Evolution at Wits University, will be
publishing their latest research on what our early ancestors ate, online in the
journal, Nature, on August 8, 2012. The paper titled 'Evidence for diet but not
landscape use in South African early hominins' was authored by Vincent Balter
from the Ecole Normale Supérieure in Lyon, France; Jose´ Braga from the
Université de Toulouse Paul Sabatier in Toulouse in France; Philippe Te´louk
from the Ecole Normale Supérieure in Lyon in France; and Thackeray from the
University of the Witwatersrand in Johannesburg in South Africa.
According to Thackeray, the results of the study show that Paranthropus had a
primarily herbivorous-like diet, while Homo included a greater consumption of
meat.
Signatures of essential chemical elements have been found in trace amounts in
the tooth enamel of the three fossils genera, and the results are indicators of
what South African hominins ate and what their habitat preferences were.
Strontium and barium levels in organic tissues, including teeth, decrease in
animals higher in the food chain. The scientists used a laser ablation device,
which allowed them to sample very small quantities of fossil material for
analysis. Since the laser beam was pointed along the growth prisms of dental
enamel, it was possible to reconstruct the dietary changes for each hominin
individual.
Thackeray states that the greater consumption of meat in the diet of early
forms of Homo could have contributed to the increase in brain size in this
genus.
Australopithecus probably ate both meat and the leaves and fruits of woody
plants. The composition of this diet may have varied seasonally.
Apart from the dietary differences, the new results indicate that the
home-range area was of similar size for species of the three hominin genera.
The scientists have also measured the strontium isotope composition of dental
enamel. Strontium isotope compositions are free of dietary effects but are
characteristic of the geological substrate on which the animals lived.
According to the results all the hominids lived in the same general area, not
far from the caves where their bones and teeth are found today.
Professor Vincent Balter of the Geological Laboratory of Lyon in France,
suggests that up until two millions years ago in South Africa, the
Australopithecines were generalists, but gave up their broad niche to
Paranthropus and Homo, both being more specialised than their common ancestor.
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Story Source:
The above story is reprinted from materials provided by University of the
Witwatersrand, via EurekAlert!, a service of AAAS.
Note: Materials may be edited for content and length. For further
information, please contact the source cited above.
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following formats:
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University of the Witwatersrand (2012, August 8). Early human ancestors had
more variable diet. ScienceDaily. Retrieved August 8, 2012, from
http://www.sciencedaily.com /releases/2012/08/120808132711.htm
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of
ScienceDaily or its staff.
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