Eating lizards: a millenary habit evidenced by Paleoparasitology
© Sianto et al.; licensee BioMed Central Ltd. 2012
Received: 30 March 2012
Accepted: 1 October 2012
Published: 25 October 2012
Analyses of coprolites have contributed to the knowledge of diet as well as infectious diseases in ancient populations. Results of paleoparasitological studies showed that prehistoric groups were exposed to spurious and zoonotic parasites, especially food-related. Here we report the findings of a paleoparasitological study carried out in remote regions of Brazil’s Northeast.
Eggs of Pharyngodonidae (Nematoda, Oxyuroidea), a family of parasites of lizards and amphibians, were found in four human coprolites collected from three archaeological sites. In one of these, lizard scales were also found.
Through the finding of eggs of Pharyngodonidae in human coprolites and reptile
scales in one of these, we have provided evidence that humans have consumed reptiles at least 10,000 years ago. This food habit persists to modern times in remote regions of Brazil’s Northeast. Although Pharyngodonidae species are not known to infect humans, the consumption of raw or undercooked meat from lizards and other reptiles may have led to transmission of a wide range of zoonotic agents to humans in the past.
As in modern times, diet varied among prehistoric human groups and small animals, including lizards and other reptiles, were important food sources for prehistoric people[1, 2]. Analyses of human coprolites demonstrate this dietary diversity. Coprolites also contain intestinal parasites transmitted by contaminated food or water, including zoonotic helminths. Moreover, spurious parasites can also be found in human coprolites and continue to occur, especially in current groups with traditional food habits. By spurious, we mean parasite eggs that are not infective to humans and pass harmlessly through the human intestinal tract. Parapharyngodon sceleratus Chatterji, 1933 (Oxyuroidea: Pharyngodonidae) eggs were recorded in lizard coprolites (Tropidurus torquatus, Squamata, Tropiduridae) dating from 9,000 to 11,000 years. The diagnosis was based on egg morphology and metric parameters in comparison with published checklists. The parasite is known to commonly occur in several lizard and amphibian species of the American continent[6–10].
The first coprolite was collected in the archaeological layer dated to 10,640 ± 80 years before present (BP) and located in the site known as Toca dos Coqueiros (Archaeological Area of São Raimundo Nonato). Two other samples were collected in the site of Toca da Baixa dos Caboclos (Archaeological Area of São Raimundo Nonato) from two human burials dated respectively 525 to 315 (Beta 136209) and 530 to 440 (Beta 136208) cal years BP.
A fourth coprolite was collected in the archaeological site of Furna do Estrago (Pernambuco state), which is located in an area of upland forests, a mesic enclave, representing a true "oasis" in a semiarid region. The coprolite was found in a human burial dated between 1860 ± 50 (Beta 145954) and 1610 ± 70 (Beta 145955) years BP.
A careful analysis of food remains was carried out. All coprolites showed macroscopic and microscopic remains consistent with those expected for a typical human diet, such as seeds, plant fibers, cooked starch grains, phytoliths, charcoal remains, and pollen grains. These latter were identified as belonging to the families Chenopodiaceae, Malvaceae and Convolvulaceae. Some species in these families are known for their medicinal properties and have traditionally been used, even up to the present day, to treat inflammation, abscesses, intestinal disorders, and parasites[24, 25].
Hunter-gatherers groups in different parts of the world consume freshly killed animals or living animals for their subsistence, including reptiles. The biological risks associated with consumption of reptile meat has been reviewed by Magnino et al. and includes diseases caused by bacteria, viruses, intestinal helminths and other parasites. Forty-six species of lizards are reported in the Brazilian Caatinga, including large species such as Iguana iguana and Tupinambis merianae and many others of medium and small size[27, 28]. They represent an important biomass and a food source available for human groups. The consumption of lizards is a relatively common practice in parts of Brazilian northeast semi-arid region, especially during periods of prolonged drought, when the population is forced to search alternative food resources. Today, in this study area, children and young people capture small lizards for complementary feeding of families. Anthropologically, this suggests that prehistoric people in the semiarid region of Brazil used small animals as food source similarly to hunter-gatherers and agriculturalists in North America, as discussed by Reinhard et al. and Sutton and Reinhard. It is noteworthy that in some areas of Brazil, this strategy is still used currently.
Results of the present analysis of human coprolites bring further data about spurious parasitism and food habits in prehistoric populations. We found eggs of reptilian parasites and lizard remains in human coprolites dating from 10,000 years ago to colonial times. This shows that the habit of eating lizards, still persistent in the current local population, had ancient origins in the Brazilian semiarid region. Moreover, although species of parasites belonging to the Pharyngodonidae family are not known to infect humans, it is possible that the consumption of lizard meat led to the risk of human infection by a wide variety of zoonotic agents in the past.
Coprolites were sent to our laboratory by the team of archaeologists from Fundação Museu do Homem Americano (which also provided estimated dates) and from Universidade Católica de Pernambuco- UNICAP; we received financial support from the Brazilian agencies CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and FAPERJ (Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro).
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