Diet Paleolitik mungkin termasuk siput 10.000 tahun lebih awal dari yang diduga sebelumnya--T-REC semarang--komunitas reptil semarang

13.11

Diet Paleolitik mungkin termasuk siput 10.000 tahun lebih awal dari yang diduga sebelumnya

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Diet Paleolitik  mungkin termasuk siput 10.000 tahun lebih awal dari yang diduga sebelumnya

Penduduk Paleolitik Spanyol modern...... telah memakan siput 10.000 tahun lebih awal dari tetangga mereka di Mediterania. Siput tersebar luas di Pleistosen akhir dan Holosen, tapi itu masih belum diketahui kapan dan bagaimana mereka ........read more

Paleolithic diet may have included snails 10,000 years earlier than previously thought

Date:

August 20, 2014

Source:

PLOS

Summary:

Paleolithic inhabitants of modern-day Spain may have eaten snails 10,000 years earlier than their Mediterranean neighbors. Snails were widespread in the Late Pleistocene and Holocene, but it is still unknown when and how they were incorporated into human diets.

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Paleolithic inhabitants of modern-day Spain may have eaten snails 10,000 years earlier than their Mediterranean neighbors, according to a study published August 20, 2014 in the open-access journal PLOS ONE by Javier Fernández-López de Pablo from Institut Català de Paleoecologia Humana i Evolució Social and colleagues.

Snails were widespread in the Late Pleistocene and Holocene, but it is still unknown when and how they were incorporated into human diets. The authors of this study found land snail shell remains from ~30,000 years ago at a recently discovered site in Cova de la Barriada, Spain. To better understand if the inhabitants may have eaten snails, the researchers investigated patterns of land snail selection, consumption, and accumulation at the site, and then analyzed the shells' decay, fossilization process, composition, and age at death by measuring the shell size.

Scientists found groupings of complete shells from a large land snail species at three areas of the site, corresponding to different time points ~30,000 years ago. The adult snails were close to prehistoric human-constructed structures that may have been used to cook the snails, along with stone tools, and other animal remains that were likely roasted in ambers of pine and juniper at 375 C. The authors posit that these results point to previously undiscovered patterns of invertebrate use and may highlight a broadening of the human diet in the Upper Paleolithic in the Mediterranean basin. In neighboring Mediterranean areas, eating land snails didn't appear until about 10,000 years later, which may make these newly found snail shells the oldest known evidence that ancient human populations used them as a food resource in Europe ~30,000 years ago.

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Story Source:

The above story is based on materials provided by PLOS. Note: Materials may be edited for content and length.

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Journal Reference:

1. Javier Fernández-López de Pablo, Ernestina Badal, Carlos Ferrer García, Alberto Martínez-Ortí, Alfred Sanchis Serra. Land Snails as a Diet Diversification Proxy during the Early Upper Palaeolithic in Europe. PLoS ONE, 2014; 9 (8): e104898 DOI: 10.1371/journal.pone.0104898

http://www.sciencedaily.com/releases/2014/08/140820164658.htm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Mengapa manusia menggantikan “Neanderthal” ? diet Paleo bukan pengubah , iklim yang melakukan--T-REC semarang--komunitas reptil semarang

07.17

neandertal

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Mengapa manusia menggantikan “Neanderthal” ? diet Paleo bukan pengubah , iklim  yang melakukan

Mengapa manusia menggantikan “Neanderthal” ? diet Paleo bukan pengubah , iklim  yang melakukan

Date:

March 17, 2014

Source:

Universitaet Tübingen

Summary:

Why were Neanderthals replaced by anatomically modern humans around 40,000 years ago? One popular hypothesis states that a broader dietary spectrum of modern humans gave them a competitive advantage on Neanderthals. Geochemical analyses of fossil bones seemed to confirm this dietary difference. Indeed, higher amounts of nitrogen heavy isotopes were found in the bones of modern humans compared to those of Neanderthals. However, these studies did not look at possible isotopic variation of nitrogen isotopes in the food resource themselves. In fact, environmental factors such as aridity can increase the heavy nitrogen isotope amount in plants, leading to higher nitrogen isotopic values in herbivores and their predators even without a change of subsistence strategy.

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Why were Neanderthals replaced by anatomically modern humans around 40,000 years ago? One popular hypothesis states that a broader dietary spectrum of modern humans gave them a competitive advantage on Neanderthals. Geochemical analyses of fossil bones seemed to confirm this dietary difference. Indeed, higher amounts of nitrogen heavy isotopes were found in the bones of modern humans compared to those of Neanderthals, suggesting at first that modern humans included fish in their diet while Neanderthals were focused on the meat of terrestrial large game, such as mammoth and bison.

However, these studies did not look at possible isotopic variation of nitrogen isotopes in the food resource themselves. In fact, environmental factors such as aridity can increase the heavy nitrogen isotope amount in plants, leading to higher nitrogen isotopic values in herbivores and their predators even without a change of subsistence strategy. A recent study published in Journal of Human Evolution by researchers from the University of Tübingen (Germany) and the Musée national de Préhistoire in Les Eyzies-de-Tayac (France) revealed that the nitrogen isotopic content of animal bones, both herbivores, such as reindeer, red deer, horse and bison, and carnivores such as wolves, changed dramatically at the time of first occurrence of modern humans in southwestern France.

The changes are very similar to those seen in human fossils during the same period, showing that there was not necessarily a change in diet between Neanderthals and modern humans, but rather a change in environment that was responsible for a different isotopic signature of the same food resources.

Moreover, this isotopic event coinciding in timing with the replacement of Neanderthals by modern humans may indicate that environmental changes, such as an increase of aridity, could have helped modern humans to overcome the Neanderthals.

These new results, together with recently published research showing that Neanderthals had more skills and exploited more diverse food resources than previously thought, makes the biological differences between these two types of prehistoric humans always smaller. In this context, the exact circumstances of the extinction of Neanderthals by modern humans remain unclear and they are probably more complex than just a behavioral superiority of one type of humans compared to the other.

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Story Source:

The above story is based on materials provided by Universitaet Tübingen. Note: Materials may be edited for content and length.

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Journal Reference:

1. Hervé Bocherens, Dorothée G. Drucker, Stéphane Madelaine. Evidence for a 15N positive excursion in terrestrial foodwebs at the Middle to Upper Palaeolithic transition in south-western France: Implications for early modern human palaeodiet and palaeoenvironment. Journal of Human Evolution, 2014; DOI: 10.1016/j.jhevol.2013.12.015

http://www.sciencedaily.com/releases/2014/03/140317084643.htm

 

 

 

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