July 19, 2012
Neanderthals Had Knowledge Of Plant Healing Qualities
redOrbit Staff & Wire Reports - Your Universe Online
A team of researchers has provided the first molecular evidence that Neanderthals not only ate a range of cooked plant foods, but also understood their nutritional and medicinal qualities.
The researchers, led by the Universitat AutÃ²noma de Barcelona and the University of York, 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 SidrÃ³n.
Their results provide another twist to the story - the first molecular evidence for medicinal plants being used by a Neanderthal individual.
According to a prepared statement by the researchers, 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 AutÃ²noma 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 SidrÃ³n 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 had shown that the Neanderthals in El SidrÃ³n had the bitter taste perception gene, evidence of which had been found trapped within dental calculus.
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 chamomile 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."
A total of 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 that evidence for food, cooked and plantlike are showing up in the 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 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 SidrÃ³n represent the oldest granules ever to be confirmed using a biochemical test, while ancient bacteria found embedded in the calculus suggests that researchers have the potential for future studies in oral health.
The archaeological cave site of El SidrÃ³n, located in the Asturias region of northern Spain, contains the best collection of Neanderthal remains found in the Iberian Peninsula and one of the most important active sites in the world. Discovered in 1994, it contains around 2,000 skeletal remains of at least 13 individuals dating back around 47,300 to 50,600 years.
Antonio Rosas, of the Museum of Natural History in Madrid — CSIC (Spanish National Research Council), said: "El SidrÃ³n has allowed us to banish many of the preconceptions we had of Neanderthals. Thanks to previous studies, we know that they looked after the sick, buried their dead and decorated their bodies. Now another dimension has been added relating to their diet and self-medication."
The study is published in Naturwissenschaften.