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Starch Grains on Human Teeth Reveal Early Broad Crop Diet in Northern Peru

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Starch Grains on Human Teeth Reveal Early Broad Crop Diet in Northern Peru Starch grains on human teeth reveal early broad crop diet in northern Peru Dolores R. Pipernoa,b,1 and Tom D. Dillehayc,d aArchaeobiology Program, Department of Anthropology, Smithsonian National Museum of Natural History, Washington, DC 20560; bSmithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Republic of Panama; cDepartment of Anthropology, Vanderbilt University, Nashville, TN 37265; and dDepartamento de Antropología, Universidad Austral de Chile, Valdivia, Chile Edited by Joyce Marcus, University of Michigan, Ann Arbor, MI, and approved October 22, 2008 (received for review September 3, 2008) Previous research indicates that the N˜ anchoc Valley in northern come from an estimated minimum of six to eight individuals, Peru was an important locus of early and middle Holocene human probably from both sexes; three complete individuals are also settlement, and that between 9200 and 5500 14C yr B.P. the valley represented (Table 1). inhabitants adopted major crop plants such as squash (Cucurbita We cannot state with much precision how much of an indi- moschata), peanuts (Arachis sp.), and cotton (Gossypium barba- vidual’s lifetime the tooth calculus that was studied represents. dense). We report here an examination of starch grains preserved Little information is available on the rate of calculus formation in the calculus of human teeth from these sites that provides direct but because it accumulates over an individual’s life if not evidence for the early consumption of cultivated squash and removed, at least several years of diet is probably represented for peanuts along with two other major food plants not previously each tooth studied. To remove dental calculus and examine and detected. Starch from the seeds of Phaseolus and Inga feuillei, the identify the starch in it we used nondestructive methods devel- flesh of Cucurbita moschata fruits, and the nuts of Arachis was oped by ourselves and large modern reference collections routinely present on numerous teeth that date to between 8210 housed in D.R.P.’s laboratory (Methods and SI; we also searched and 6970 14C yr B.P. Early plant diets appear to have been diverse for phytoliths in the calculus preparations and found none, not and stable through time and were rich in cultivated foods typical surprising in view of the fact that the plants evidenced on the of later Andean agriculture. Our data provide early archaeological teeth and many others that were potentially available in the study evidence for Phaseolus beans and I. feuillei, an important tree crop, region do not produce phytoliths in their edible parts). and indicate that effective food production systems that contrib- uted significant dietary inputs were present in the N˜ anchoc region Results by 8000 14C yr B.P. Starch grain studies of dental remains document Most teeth yielded some starch grains and 13 contained them in plants and edible parts of them not normally preserved in archae- significant quantities. Table 1 contains the kinds and number of ological records and can assume primary roles as direct indicators grains retrieved from these specimens. Table S1 contains data on of ancient human diets and agriculture. the teeth with fewer grains. Ubiquitous and consistently common over the 1,000-year period represented are four taxa, Phaseolus, early diets ͉ South America ͉ food production Arachis, Cucurbita moschata, and Inga feuillei, indicating they were major dietary sources (Table 1) (Fig. 2 a–e). We cannot determine conclusively whether the Phaseolus starch is from a he Late Pleistocene to Middle Holocene N˜ anchoc prece- domesticated bean or whether it has a greater affinity to P. ramic culture is known from 46 sites in the N˜ anchoc Valley, T lunatus or P. vulgaris (Fig. 1 a and b for archaeological Phaseolus; a tributary of the Zan˜a Valley located at 500 m above sea level Fig. S1 A and B for modern comparisons). It is generally on the lower western slopes of the Andes (1–7) (Fig. 1). considered that single domestications of the Andean lima and Recovered from hearths and floors in 13 excavated house ϳ 14 ϳ common bean occurred, respectively, in southern Ecuador/ structures dating from 10,100 to 5500 C yr B.P. ( 11,200 to northern Peru and southern Peru/Bolivia (8–12). Three species 6000 calendar years ago or cal. B.P.) were the macrobotanical of wild Phaseolus closely related to domesticated species, all of remains of a variety of plant cultivars along with gathered wild which were analyzed here, grow in Peru: P. augusti, P. pachyr- plants and the bones of various large and small animal species, rhizoides, and wild P. vulgaris. The first two probably should be providing evidence for a broad spectrum and mixed subsistence merged taxonomically and are thought to be the lima’s wild economy in a tropical dry forest setting (1–3, 6). Between 10,000 14 ancestor (9, 12). and 7000 C yr B.P. during the Late Paijan and Las Pircas In most teeth samples, average and maximum Phaseolus grain phases, crop production was practiced close to small, permanent, size is considerably larger than in wild common bean, which can circular houses. Associated with the plant remains during the be excluded from representation on this basis (Table 2 and Table 14 subsequent Tierra Blanca phase between 7000 and 5000 Cyr S3 for comparative modern data). However, there is a broad B.P. were stone hoes, larger grinding stones, plots for planting range of size overlap between wild and domesticated lima bean crops, small-scale irrigation canals and public mounds (site starch, and size values for all but one of the teeth fall within this CA-09–04, Fig. 1), and rectangular houses (1–3, 6). overlap zone. In sample 19, dated to 6970 14C yr B.P., average We examined 39 human teeth from Las Pircas occupations at length and width of Phaseolus grains exceed those of all modern four different sites [Table 1, supporting information (SI) Table wild beans studied. Given the size similarities between wild and S1]. The teeth were mostly isolated remains from adults and subadults that were securely embedded within intact and sealed house floors and directly associated with radiocarbon dates Author contributions: D.R.P. and T.D.D. designed research; D.R.P. performed research; made on human bone, macrobotanical plant remains, and wood D.R.P. and T.D.D. analyzed data; and D.R.P. and T.D.D. wrote the paper. charcoal ranging from 8210 Ϯ 180 to 6970 Ϯ 60 14C yr B.P. The authors declare no conflict of interest. (Methods; Table 1; Tables S1 and S2; see ref. 1 for a more This article is a PNAS Direct Submission. 14 complete list of C dates from the sites). Three teeth were 1To whom correspondence should be addressed. E-mail: [email protected]. submitted to Beta Analytic Inc. for accelerator mass spectrom- This article contains supporting information online at www.pnas.org/cgi/content/full/ eter (AMS) radiocarbon dating but insufficient protein re- 0808752105/DCSupplemental. mained for an age determination (Table 1). The isolated teeth © 2008 by The National Academy of Sciences of the USA 19622–19627 ͉ PNAS ͉ December 16, 2008 ͉ vol. 105 ͉ no. 50 www.pnas.org͞cgi͞doi͞10.1073͞pnas.0808752105 Downloaded by guest on September 27, 2021 6 0 0 N CA-0 -9 52 CA-09-04 PERU 800 P a c if Zana River N ic O a c n e a Lima c n s h o Pirca o C de l a Cruz 1 e las da. d c ,0 Q Cuzco 0 R 0 iv e Study erA a r lla abu a C CA-09-71 a. L Qd llo ti u n a C . a Qd 1 , 2 0 0 a c 6 LEGEND n 00 l ,000 Ba 1 Archaeological Site CA-09-77 a Teeth Studied from r er Archaeological Site i .T Co El Balcón Ñanchoc River d Co El Coche StreamCo Conq Flowsiu Qa 0 1 2km Fig. 1. Location of the N˜ anchoc Valley in northern Peru and archaeological sites discussed in this study. domesticated lima bean starch, we prefer to exercise caution at B.P.) (13). The earliest common bean remains, from Guitarrero this time with the interpretation of this single tooth showing a Cave in central highland Peru (13), presently date to ca. 4600 14C domesticated grain size. Starch from wild and domesticated yr B.P. (ca. 5000 cal. B.P.). Considering this evidence along with Phaseolus species is too similar in morphology to attempt a the greater proximity of the N˜ anchoc region to the probable species-specific identification on this basis (Methods and Fig. S1 hearth of lima domestication, it may be more likely that the A and B). Phaseolus starch is from a lima rather than a common bean. The ecology of wild Phaseolus does strongly suggest that the Previous work identified the early presence of a domesticated starch grains represent cultivars. Wild lima and common beans squash species, Cucurbita moschata, which likely is native to are found today in dry and thorny or humid forest at elevations lowland northern South America, possibly Colombia. Distinc- between 1,800 and 3,000 m above sea level (asl) (9). The tive, elliptical-shaped seeds dark brown in color that are unique N˜ anchoc sites, located at 500 m asl in dry tropical forest, are to C. moschata were recovered from sites CA-09–77 and CA- considerably outside of the elevational range and native habitats 09–27 where they were directly dated to 9240 Ϯ 50 14C yr B.P. of these plants. The previous earliest record for Phaseolus in and 7660 Ϯ 40 14C yr B.P., respectively (1).
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