Neanderthals Found Certain Plants Important, Had Medicine
2012-07-20 0:00


An international team of researchers, led by the Universitat Autňnoma de Barcelona and the University of York, has provided the first molecular evidence that Neanderthals not only ate a range of cooked plant foods, but also understood its nutritional and medicinal qualities.

Until recently Neanderthals, who disappeared between 30,000 and 24,000 years ago, were thought to be predominantly meat-eaters. However, evidence of dietary breadth is growing as more sophisticated analyses are undertaken.

Neanderthal remains found in El Sidrón Cave
Researchers from Spain, the UK and Australia combined pyrolysis gas-chromatography-mass spectrometry with morphological analysis of plant microfossils to identify material trapped in dental calculus (calcified dental plaque) from five Neanderthals from the north Spanish site of El Sidrón.

Their results, published in Naturwissenschaften - The Science of Nature this week, provide another twist to the story -- the first molecular evidence for medicinal plants being used by a Neanderthal individual.

The researchers say the starch granules and carbohydrate markers in the samples, plus evidence for plant compounds such as azulenes and coumarins, as well as possible evidence for nuts, grasses and even green vegetables, argue for a broader use of ingested plants than is often suggested by stable isotope analysis.

Lead author Karen Hardy, a Catalan Institute of Research and Advanced Studies (ICREA) Research Professor at the Universitat Autňnoma de Barcelona (UAB) and an Honorary Research Associate at the University of York, UK, said: "The varied use of plants we identified suggests that the Neanderthal occupants of El Sidrón had a sophisticated knowledge of their natural surroundings which included the ability to select and use certain plants for their nutritional value and for self-medication. While meat was clearly important, our research points to an even more complex diet than has previously been supposed."

Earlier research by members of this team had shown that the Neanderthals in El Sidrón had the bitter taste perception gene. Now trapped within dental calculus researchers found molecular evidence that one individual had eaten bitter tasting plants.

Dr Stephen Buckley, a Research Fellow at the University of York’s BioArCh research facility, said: "The evidence indicating this individual was eating bitter-tasting plants such as yarrow and camomile with little nutritional value is surprising. We know that Neanderthals would find these plants bitter, so it is likely these plants must have been selected for reasons other than taste."

Ten samples of dental calculus from five Neanderthals were selected for this study. The researchers used thermal desorption and pyrolysis gas-chromatography-mass spectrometry to identify both free/unbound and bound/polymeric organic components in the dental calculus. By using this method in conjunction with the extraction and analysis of plant microfossils, they found chemical evidence consistent with wood-fire smoke, a range of cooked starchy foods, two plants known today for their medicinal qualities, and bitumen or oil shale trapped in the dental calculus.

Professor Matthew Collins, who heads the BioArCh research facility at York, said: "Using mass spectrometry, we were able to identify the building blocks of carbohydrates in the calculus of two adults, one individual in particular having apparently eaten several different carbohydrate-rich foods. Combined with the microscopic analysis it also demonstrates how dental calculus can provide a rich source of information."

The researchers say evidence for cooked carbohydrates is confirmed by both the cracked/roasted starch granules observed microscopically and the molecular evidence for cooking and exposure to wood smoke or smoked food in the form of a range of chemical markers including methyl esters, phenols, and polynuclear aromatic hydrocarbons found in dental calculus.

Professor Les Copeland from the Faculty of Agriculture and Environment, University of Sydney, Australia, said: "Our research confirms the varied and selective use of plants by Neanderthals."

The study also provides evidence that the starch granules reported from El Sidrón represent the oldest granules ever to be confirmed using a biochemical test, while ancient bacteria found embedded in the calculus offers the potential for future studies in oral health.


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