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versión On-line ISSN 0717-7356
Chungará (Arica) v.38 n.1 Arica jun. 2006
Chungara, Revista de Antropología Chilena
THE TEST OF COMPETING MODELS FOR THE PREHISTORIC PEOPLING OF THE AZAPA VALLEY, NORTHERN CHILE, USING MATRIX CORRELATIONS
MODELOS ALTERNATIVOS PARA EXPLICAR EL POBLAMIENTO PREHISTÓRICO DEL VALLE DE AZAPA, NORTE DE CHILE , MEDIANTE ANÁLISIS DE CORRELACIÓN DE MATRICES
Richard C. Sutter1
1 Department of Anthropology Indiana Purdue University Fort Wayne 2101 E. Coliseum Blvd. Fort Wayne, IN 46805-1499 U.S.A. SutterR@ipfw.edu.
This study reports biodistances from nonmetric dental traits for eleven mortuary samples -an Andean Paleoindian sample, a Tiwanaku sample, and nine from the Azapa Valley- to test three models for the prehistoric population dynamics of the Azapa Valley, Chile, using matrix correlation analysis of hypothetical design matrices. These models include: (1) Tiwanaku colonization during the Middle Period, (2) simple gene flow over time, and (3) a modified gene flow model with coastal groups demonstrating genetic continuity while diverging from valley populations. The Tiwanaku sample demonstrates significant biodistances with five of the nine Azapa Valley samples, and large but nonsignificant differences with all but the late Desarrollo Regional Gentilar sample from Azapa-8. Inland samples from the Azapa Valley generally become more similar to the Tiwanaku sample through time suggesting gene flow, while coastal samples of the region demonstrate a degree of epigenetic coherence. The results of Mantel tests for each of the three design matrices indicates that the Tiwanaku and simple gene flow models produce nonsignificant and low correlations with the biodistance matrix while the gene flow with coastal divergence model produces significant results. The implications of these results are discussed.
Key words: Biodistance analysis, skeletal remains, matrix correlation.
En este trabajo se analizan distancias biológicas obtenidas de rasgos no-métricos dentales extraídas de once muestras mortuorias -una muestra de paleoindios andinos, otra de Tiwanaku y nueve del valle de Azapa- para poner a prueba tres modelos que expliquen las dinámicas prehistóricas poblacionales en el valle de Azapa, Chile, mediante análisis de correlación de matrices hipotéticas. Estos modelos incluyen: (1) la colonización durante el período Medio por los Tiwanaku, (2) flujo genético a través del tiempo, (3) y un modelo de flujo genético donde los grupos costeros muestran continuidad genética mientras divergen de poblaciones del valle, las cuales reciben flujo genético del altiplano. La muestra de Tiwanaku está separada por distancias biológicas significativas con cinco de las nueve muestras del valle de Azapa, y distancias grandes pero no significativas con las demás muestras, exceptuando la muestra Gentilar del desarrollo regional tardío de Azapa-8. Las muestras del valle se vuelven más similares a la muestra de Tiwanaku a través del tiempo, lo que sugiere flujo genético, mientras que las muestras costeras manifiestan una coherencia epigenética. Los resultados de la prueba de Mantel para cada uno de los tres modelos indica que los modelos de colonización tiwanakoide y de flujo genético no producen resultados significativos, mientras que el modelo de flujo genético con divergencia costera sí lo hace. Se discuten las consecuencias de estos resultados en relación con publicaciones anteriores.
Palabras claves: análisis de distancias biológicas, restos esqueletales, análisis de correlación de matrices.
The prehistory of the Azapa Valley has been of interest to scholars for nearly a century now, and has included examinations of both cultural developments and prehistoric population dynamics. One of the topics most thoroughly investigated by both archaeologists biological anthropologists working in northern Chile, is the relationship between prehistoric inhabitants of the Azapa Valley with populations from the adjacent altiplano to the east. Of particular interest has been their relationship to the Middle Period Tiwanaku of Bolivia. Historically archaeologists such as Uhle (1919), Bird (1943), and Mostny (1944) established relative chronological sequences using ceramics found in the region and their relationship to those from Tiwanaku, while subsequent investigators proposed that the Tiwanaku sent ethnic colonists to the Azapa Valley according to the classic model of verticality (i.e., zonal complementarity) proposed by Murra (1967, 1972). Following the archaeologists lead, subsequent bioarchaeological investigations for the Azapa Valley focused on determining whether phenotypic evidence exists for prehistoric ethnically altiplano colonists. To date, numerous biodistance have been conducted, but no consensus has been reached regarding the presence of ethnically Tiwanaku colonists in the prehistoric Azapa Valley, Chile. This investigation endeavors to test three competing models explaining prehistoric population dynamics for the Azapa Valley, Chile, with particular focus on the Middle Period, using nonmetric tooth and cusp traits and matrix correlation analysis among generated biodistances and the design matrices for each of the three competing models.
Prehistory of Azapa Valley
Largely based upon lithic similarities in the coastal valley and adjacent highlands, archaeologists working in northern Chile argue that the early Archaic Period (8,000-1,000 B.C.) inhabitants of the Azapa Valley where likely transhumant hunter-gatherers who probably frequented the adjacent highlands to the east (Santoro 1989, 1993). Among the earliest human remains of the Azapa Valley from sites Acha-2 and Acha-3, there is ample evidence for the exploitation of marine resources in the form of fish and shellfish remains, in addition to human remains exhibiting auditory exostoses -a bony inner ear pathology associated with frequent ear infections caused by cold water diving (Arriaza and Muñoz 1993; Standen et al. 1997). Eventually, these early Archaic Period populations began to focus their economic activities almost exclusively on maritime resources and began to practice artificial mummification (Arriaza 1994, 1995; Guillén 1992). Phenotypic, cultural, and molecular evidence has been used to suggest that these people -culturally referred to as the Chinchorro- had their genetic and cultural origins among either the earlier Andean Paleoindians (Sutter 1997, 1999:82, 2005a, 2005c), or among Amazonian populations (Moraga et al. 2001; Rivera 1975, 1984, 1997, 1991; Rivera and Rothhammer 1986; Rothhammer and Silva 1989, 1992; Rothhammer et al. 1984, 2002).
The Formative Period (1,000 B.C.-A.D. 500) in the Azapa Valley begins with the appearance of ceramics, settled village life, and agriculture. Sand-tempered ceramics are found in the burial contexts and middens of Faldas del Morro (Dauelsberg 1985) and El Laucho (Focacci 1974) coastal sites of northern Chile, where inhabitants largely exploited maritime resources. The Azapa (1,000-800 B.C.) and Alto Ramírez (800 B.C.-A.D. 500) phase sites are located a few kilometers inland. Inhabitants of these sites practiced a mixed agropastoral and maritime subsistence (Muñoz 1981, 1983a, b, 1989; Santoro 1980a, b, c). Although some scholars contend that the appearance of fiber-tempered ceramics contemporaneous with those from the altiplano Chiripa site, and textiles with altiplano Pukara motifs are evidence for Formative Period altiplano colonists or population movements into the Azapa Valley (Kolata 1993:76; Muñoz 1983b,1989; Muñoz 1983; Rivera 1984,1991; Rothhammer et al. 1989:406, 2002:263; Santoro 1980b; Varela and Cocilovo 2002:264), others have suggested that both the genetic and cultural origins of Formative Period populations is among the preceding Chinchorro (Rothhammer and Santoro 2001; Sutter 1997, 1999, 2000, 2005a, b).
The Middle Period (A.D. 500-1,100) in northern Chile is defined by the presence both of Tiwanaku V and Tiwanaku-inspired Azapa Valley Cabuza, Loreto Viejo, and Maitas-Chiribaya ceramics (Berenguer and Dauelsberg 1989). The prevailing opinion among archaeologists working in northern Chile is that Cabuza and Maitas-Chiribaya Middle Period sites in the Azapa Valley represent pre-Inka example of altiplano colonies according to Murra's classic model of verticality (Berenguer 1978; Browman 1980, 1984; Focacci 1969a:22, 1981:68; Kolata 1993:76; Lumbreras 1972; Mujica 1985; Mujica et al. 1983; Rivera 1975, 1991). Indeed, Focacci (1981:68) and Berenguer and Dauelsberg (1989) propose that Cabuza ceramics are directly derived from Tiwanaku IV altiplano, populations and that subsequent Maitas-Chiribaya ceramics represent a later derived form of Tiwanaku-derived ceramics that chronologically correspond to Tiwanaku V, while Rivera (1991) and Berenguer et al. (1988) suggest that Azapa Valley burials associated with Loreto Viejo ceramics represent Tiwanaku elite. It should be noted, however, that other scholars have presented calibrated radiocarbon dates for both the Azapa Valley and comparative archaeological evidence from Moquegua. The calibrated dates indicate that these cultural phenomena -while technically beginning during the terminal Middle Period- are largely post-Tiwanaku cultural phenomena (Cassman 1997:61; Owen 1993:413-420; Sutter 1997:33-36, 2005b:185-186). In any case, Tiwanaku V ceramics and textiles have also been recovered from burials and ceremonial túmulo mounds from coastal valley sites Azapa-6, Azapa-71, Azapa-75, Azapa-141, and Azapa-143 (Berenguer and Dauelsberg 1989; Focacci 1981, 1983; Goldstein 1995; Muñoz 1989). Interestingly, Muñoz (1982:120) notes a remarkable lack of Middle Period coastal sites along the beaches of the Azapa Valley, possibly indicating that the Tiwanaku resettled coastal populations. A number of biodistance studies based upon craniometrics and mtDNA have suggested that Middle Period Azapa Valley populations had their genetic origins among the Tiwanaku (Cocilovo and Rothhammer 1999; Moraga et al. 2005; Rothhammer et al. 1982, 1983, 1986, 1989:406, 2003:272; Varela and Cocilovo 2002:264-265), while others who investigated nonmetric dental (Sutter 1997, 1999, 2000, 2005a, b, 2005c) and cranial data (Guillén 1992; Sutter and Mertz 2004) find that the differences among Middle Period Azapa Valley populations and earlier populations from the valley are nonsignificant, suggesting that detected cultural changes during the Middle Period were largely the result of cultural diffusion rather than population placement by altiplano colonists.
With the demise of the Tiwanaku in the south central Andes, diverse ceramics, burial practices, textiles, and architecture styles begin to emerge throughout the coastal valleys of the region. Within the Azapa Valley this period is referred to as the Desarrollo Regional (A.D. 1,100-1,470) and is defined by the emergence of the San Miguel, Pocoma and Gentilar ceramic traditions (Espoueys et al. 1994; Rivera 1991; Schiappacasse et al. 1989). These traditions are confined to the coastal valley regions of the south central Andes and have no known altiplano counterparts. Grave good and midden analyses reflect a mixed agro-pastoral-maritime subsistence for populations associated with these traditions (Focacci 1982; Muñoz 1983, 1993; Muñoz and Focacci 1985). Recent biodistance analyses suggest that populations dynamics for the Azapa Valley during the Desarrollo Regional was characterized by a marked increase in gene flow into the valley following the collapse of the Tiwanaku (Rothhammer and Santoro 2001; Rothhammer et al. 2002; Sutter 1997; 2005a, b; 2005c), while coastal populations apparently maintained a degree of genetic continuity with earlier coastal peoples (Cocilovo and Rothhammer 1999; Cocilovo et al. 2001; Sutter 1997, 1999:85, 2000:64, 2005b:193-195; Sutter and Mertz 2004:139-140; Varela and Cocilovo 2002:265).
Summary of Biodistance Studies
While the number of conclusions reached by biodistance studies for the Azapa Valley are numerous and varied -as described above- this investigation focuses on the three most prevalent models for explaining population dynamics for prehistoric inhabitants of the valley, with particular focus on the Middle Period. These models include: (1) Tiwanaku colonization (Cocilovo and Rothhammer 1999; Moraga et al. 2005; Rothhammer et al. 1982, 1983, 1986, 1989:406, 2003:272) (Figure 1), (2) gradual gene flow into the valley from the adjacent altiplano to the east (Guillén 1992; Rothhammer and Santoro 2001; Rothhammer et al. 1983, 1984, 2002) (Figure 2), and (3) a modified version of the gene flow model which posits that inland agricultural populations of the Azapa Valley received low levels of gene flow from the altiplano, while coastal populations of the region exhibited a degree of genetic continuity with their Archaic Period Chinchorro ancestors (Sutter 1997, 1999:85, 2000:64, 2005b:193-195; Sutter and Mertz 2004:139-140; Varela and Cocilovo 2002:265) (Figure 3). The assumptions of each of these models are used to develop hypothetical design matrices for testing against biodistance analyses as described in the subsequent section.
Materials and Methods
A total of 11 mortuary samples are examined by this study (Table 1). The first is the Andean Paleoindian sample and consists of the dental frequencies for human remains from the Andes pre-dating 8,000 calibrated radiocarbon years before present. Sample composition can be found in Sutter (2005c). Although the wide geographic distribution of remains used for this sample is problematic, the paucity of human remains from the Andes predating 8,000 years before present makes it necessary to combine these early human remains. Further, sample composition for the Andean Paleoindians is consistent with how early human remains have been analyzed by other biodistance studies (Powell 1993, 1995; Powell and Neves 1998; Turner 1983, 1985).
Nine mortuary samples from Azapa Valley sites are analyzed by this study. The Chinchorros represent the Archaic Period population of the Azapa Valley. The remains from four Chinchorro beach sites were combined into a single sample for statistical analyses. These include Morro-1 (Standen 1991), Morro-1/5 (Guillén 1992), Morro-1/6 (Focacci and Chacón 1989), and Playa Miller-8 (Alvarez 1969).
The Formative Period for the Azapa Valley is represented by two samples. The Alto Ramírez sample includes Azapa phase burials from the site Azapa-71 and Alto Ramírez phase burials from the sites Azapa-14, Azapa-70, and Azapa-115. Sites of these phases provide the earliest evidence for coastal valley village life and incipient agriculture within the Azapa Valley (Focacci 1980; Muñoz 1981, 1983, 1989; Santoro 1980a, b, c). All sites included in the Alto Ramírez sample are located inland, 10 to 12 km from Arica. The Playa Miller-7 sample is from a coastal site that was a contem-poraneous Formative period fishing community of the El Laucho cultural tradition, where the earliest pottery of the region was also found (Focacci 1974).
The Middle Period is represented by four samples from the Azapa Valley including two from the Cabuza sites Azapa-6 and Azapa-71 (Focacci 1993) and two samples from the mixed agro-pastoral Maitas-Chiribaya sites, Azapa-75 and Azapa-140 (Muñoz and Focacci 1985).
Two Azapa Valley samples for the Desarrollo Regional are also examined by this study. The early Desarrollo Regional is represented by human remains from Playa Miller-4 -a coastal fishing community primarily associated with San Miguel ceramics (Focacci 1969b, 1974). Azapa-8 is a late Desarrollo Regional Gentilar inland sample (Focacci 1961).
An additional comparative Tiwanaku sample consists of Upper Formative period (500 B.C.-A.D. 500) and Middle Horizon (A.D. 500-1,100) individuals excavated by Bandelier (1910) from the sites Titia-Uayani (n = 28), Tiwanaku (n = 3), and Kea Kolla Chico (n = 26) (also see Stanish and Bauer 2004:193-197). Only those individuals associated with Tiwanaku and pre-Tiwanaku (Qeya) grave goods are included for this sample.
For this study, all individual's dentitions were visually inspected and scored by the author of this paper for 31 morphological tooth cusp and root traits (Table 2) using standardized casts and descriptions (Turner et al. 1991). Nonmetric dental traits are highly heritable among living populations (Berry 1978; Biggerstaff 1970, 1973; Escobar et al. 1976; Harris and Bailit 1980; Hassanali 1982; Nichol 1989; Portin and Alvesalo 1974; Scott 1973, 1980; Sofaer et al. 1972a) and have been used to reconstruct genetic relations among both prehistoric and living populations (Brewer-Carias et al. 1976; Greene 1982; Haydenblit 1996; Sofaer, et al. 1972b, 1986; Turner 1983; Wijsman and Neves 1983). Epigenetic traits have also been demonstrated to closely reflect those derived from molecular data among both humans and other nonhuman primates (Braga 2001). Such traits have the advantage of being scoreable for highly fragmented skeletal material. Given that the author of this paper scored all traits, interobserver error is not an issue. A previous study found that ranges of intraobserver error by this investigator for traits used in this study are well within recommended ranges of acceptability (Sutter 1997:162-167).
Standard data analysis procedures are used to make results presented here comparable to those presented by other nonmetric dental trait studies.Dental trait frequencies for each mortuary sample are calculated using the 'individual count' method (Turner and Scott 1977). In cases where an individual exhibits asymmetry in the expression of a given trait the greatest level of expression is used. This scoring procedure assumes that a single genotype is responsible for any given trait's expression, and that when asymmetry exists among bilateral traits, the side exhibiting the maximum expression is closest to the true underlying genotype for the trait. The procedure also maximizes sample sizes; in cases where a given trait is observable for only one antimere but not the other, the observable side is counted as the maximum expression for that trait. This scoring procedure counts individuals for the calculation of trait frequencies.
Prior to calculating biodistances among the samples, dental traits are eliminated from subsequent multivariate biodistance analyses -as required by the biodistance statistic used by this study- if they fail to exhibit significant contingency c2 values (p < 0.05) according to procedures outlined by Rothhammer et al. (1984). Traits are also eliminated if fewer than 10 observations were made for more than 10% (i.e., two) of the mortuary samples examined here. Males and females are combined in order to retain acceptable (n > 10) sample sizes. Although dental traits have been shown to exhibit little sexual dimorphism (Scott and Turner 1997), dental traits examined by this study that are significantly related to sex as determined by c2 analysis are removed from subsequent biodistance analyses. Finally, traits significantly correlated to one another are also eliminated as required for calculation of the Mean Measure of Divergence (MMD) biodistance statistic used by this study.
Prior to calculating the biodistances, dichotomized (present/absent) dental trait frequencies for each mortuary population are arcsine transformed (Greene and Myers Suchey 1976). The arcsine-transformed frequencies are used to estimate the genetic relatedness among the mortuary samples by calculating the MMD (Sjøvold 1977). The MMD is highly correlated with other measures that are commonly used in biodistance studies (Constandse-Westermann 1972; Finnegan and Cooprider 1978; Gonzalez et al. 2001a; Sokal and Sneath 1973). Importantly, the MMD can produce negative values (Greene 1982; Sjøvold 1977). This occurs when there is very little or no difference in the arcsine transformed frequencies across the traits for the two samples being compared. Negative MMDs indicate that the two mortuary samples being compared are statistically indistinguishable. The standard deviations and standardized MMDs are calculated because standardized MMD values are more appropriate when estimating biodistances among mortuary populations of different sample sizes (Sofaer et al. 1986). An MMD is statistically significant at the 0.025 level if its standardized MMD (stMMD) value is greater than 2.00 (Sjøvold 1977).
The matrix of standardized MMDs is analyzed using nonmetric multidimensional scaling (MDS) procedures. Nonmetric MDS is a useful procedure for producing easily interpretable graphical representations of complex distance matrices using the number of dimensions specified by the investigator (Kruskal 1964; Kruskal and Wish 1984). Nonmetric MDS procedures are employed by this study because they accurately reflect rank orders of dissimilarity matrices when the values are non-Euclidean, as in the case of stMMD values.
While stMMD values provide an indication as to the relative biological distance and associated significance among mortuary populations being compared, their interpretation is often equivocal and may not necessarily indicate which among a number of competing explanations is best supported by the resulting biodistances.
Hypothetical design matrices are developed for each of the three competing hypotheses regarding prehistoric populations dynamics in the Azapa Valley, Chile. The three competing models considered by this study include: large scale migration into the Azapa Valley population by Tiwanaku colonists (Figure 1); simple change over time due to gene flow from the adjacent altiplano (Figure 2); and, a variation on the gene flow model that hypothesizes genetic continuity among coastal populations through time, with populations of the inland valley receiving gradual genetic contributions from the adjacent altiplano (Figure 3). For hypothetical matrices designed for this study, for comparisons between samples of direct ancestral-descendant relationship, a distance of 1 represents each chronological period between the samples. If gene flow is hypothesized to have occurred, an additional 0.5 is added for the distance for each chronological period between the Azapa Valley samples being compared. When large scale Tiwanaku colonization is hypothesized, the distances for each of the two unrelated samples is traced back to the common point of origin (i.e., the Paleoindian sample) and summed. For comparisons with the Tiwanaku in the two gene flow models, Azapa Valley samples from each subsequent chronological period become more similar to the Tiwanaku by a distance of 0.5, assuming that the gene flow was in one direction (i.e., from the altiplano into the Azapa Valley). These models are intended to be simple so as to allow for future modification when additional results and hypotheses are developed.
ach of the three model matrices is then subjected to the matrix correlation technique. The matrix correlation technique is a well established and understood method commonly used in biodistance studies to test the strength of association between competing hypothetical matrices and the resulting matrix of biodistances using the Mantel test (González et al. 2001a, b; Mantel 1967; Smouse and Long 1992; Sokal et al. 1997; Waddle 1994). The Mantel test is a resampling technique that compares matrices using an arbitrary number of permutations. For the purposes of this study, 1,000 permutations are used. Results are considered significant at the 0.05 level.
Among the 31 tooth and root traits examined by this study, only 18 tooth-trait combinations of the samples have at least 10 observations for 90% of the 11 mortuary populations examined. Among these 18 traits, only eight traits exhibit statistically significant differences among the 11 mortuary samples (Table 3). A more complete discussion of dental trait variability among Azapa Valley mortuary samples can be found in Sutter (1997, 2000). Among these eight traits, the enamel extensions for both the first and second maxillary molars are significantly related. Because of this, the expression for the "key" tooth (in this case, the first maxillary molar) is retained for subsequent analyses according to recommendations of Turner et al. (1991). None of the remaining seven traits' expression is associated with sex nor is intercorrelated with the other five traits. The remaining seven traits are used to calculate biodistances among the 11 mortuary samples. These seven traits, and their associated number of observations, and number of individuals exhibiting the trait are provided in Table 4.
A few trends are apparent upon inspection of the dental trait frequencies presented in Table 4. More specifically, winging of the central maxillary incisors, and peg shape and congenital absence of the maxillary third molar generally increase through time among the samples, while the protostylid of the mandibular first molar also increases through time among some of the Azapa Valley samples. There is an apparent chronological trend for enamel extensions of the maxillary first molar and root number for both the first maxillary molar and second mandibular molar, with these traits frequencies generally decreasing through time among the 11 mortuary samples examined by this study. There are no clear chronological trends for the expression of the odontome, however, this trait's expression is limited to only four of the Azapa Valley samples examined here. With the exception of the expression of the odontome, it can be said that there is generally an increase through time in dental trait frequencies associated with northeast Asians (i.e., sinodonty).
The Mean Measure of Divergence, its standard deviation, and standardized MMD values based upon the seven tooth and root trait combinations that significantly vary among the eleven prehistoric mortuary samples are presented in Table 5. Inspection of the stMMD indicates all biodistance comparisons with the Andean Paleoindian sample are non-significant. This is likely due, in part, to the composition of the sample, but may also be due to the highly variable nature of the Paleoindians as noted by numerous investigators (Jantz and Owsley 1998, 2001, 2003; Lahr 1995; Powell 1993; Powell and Neves 1999). While no clear trends are apparent for biodistance comparisons with the Paleoindian sample, it is noteworthy that the most recent Gentilar mortuary sample from Azapa-8 is the most distinct from the Andean Paleoindians followed by the Middle Period Tiwanaku sample analyzed by this study. It is important to note that in a broader biodistance study by this investigator that examines prehistoric population dynamics in the Andes using dental trait variability for 44 prehistoric mortuary samples registered by Sutter (2005c), the Archaic Period Chinchorros are among the most similar to the Andean Paleoindians of all mortuary populations. This discrepancy is attributed to the data reduction techniques employed by MMD analyses: the MMD statistic requires that only traits that are not interrelated but that significantly vary among all of the samples be used for the calculation of biodistances. This study only used seven epigenetic dental traits whereas the broader study utilized 10 traits.
It is also apparent from biodistances presented in Table 5 that the Tiwanaku mortuary sample is the most distinct examined by this study. The Tiwanaku sample is significantly different from five of the nine Azapa Valley samples, including the Archaic Period Chinchorro, El Laucho sample from Playa Miller-7, the early Desarrollo Regional sample from Playa Miller-4, the Formative Period Alto Ramírez sample, and the Middle Period Cabuza sample from Azapa-71. Importantly, with the exception of the late Desarrollo Regional Gentilar sample from Azapa-8, all other stMMD comparisons with the Tiwanaku are relatively large (i.e., > 1.00) but nonsignificant. It is also noteworthy that the most similar sample to the Tiwanaku is the Gentilar sample from Azapa-8.
All biodistance values for comparisons among the Azapa Valley samples with the Archaic Period Chinchorro mortuary population are nonsignificant, although biodistances for both the Middle Period Maitas-Chiribaya sample from Azapa-140 and the late Desarrollo Regional Gentilar sample from Azapa-8 are relatively large (i.e., >1.00). The negative MMD and stMMD values for comparisons between the Chinchorros and the subsequent Formative Period Alto Ramírez and El Laucho Playa Miller-7 samples indicate that the populations represented by these samples are statistically indistinguishable from the Chinchorros and suggest an ancestral-descendant relationship between the Chinchorro and these two Formative Period populations.
The El Laucho sample from Playa Miller-7 produces statistically significant differences when compared to Middle Period and late Desarrollo Regional Azapa Valley samples from Azapa-140 (Maitas-Chiribaya), Azapa-6 (Cabuza), and Azapa-8 (Gentilar), while other comparisons with samples from the valley tend to be relatively large but nonsignificant. Interestingly, all biodistance values for comparisons among the Formative Period Alto Ramírez and other Azapa Valley mortuary samples are nonsignificant and relatively small (i.e., <1.00). It is difficult to find any clear trends among Azapa Valley samples of the Middle Period, except to say that these samples are more similar to the late Desarrollo Regional Gentilar sample from Azapa-8 than are the earlier Azapa Valley Archaic Period Chinchorros and Formative Period Alto Ramírez and Playa Miller-7 El Laucho samples.
The matrix of biodistance values among the 11 mortuary samples examined here were analyzed using nonmetric multidimensional scaling (MDS) procedures. The graphical representation of the first three dimensions of the MDS solution (Figure 4) accurately reflects the biodistances presented in Table 5 (stress = 0.047, proportion of varian-ce = 0.985). The relatively variable nature of the Andean Paleoindian sample is reflected by its position in the middle of the solution. It is also clear that the Tiwanaku sample is distinct from all other samples analyzed by this study as indicated by its position along Dimension 1 on the left-hand side of the MDS solution. Most similar to the Tiwanaku sample as indicated by its position in multivariate space is the terminal Desarrollo Regional Gentilar sample from Azapa-8, followed by the Middle Period samples from Azapa-140, Azapa-6, Azapa-71, and Azapa-75. The next most closely related is the Formative Period Alto Ramírez sample. A small grouping of coastal mortuary samples, consisting of the Archaic Period Chinchorro, Formative Period Playa Miller-7, and early Desarrollo Regional Playa Miller-4 samples, is apparent on the right-hand side of the MDS solution.
Results of the matrix correlations between the stMMD matrix and the three hypothetical matrices provide definitive results that suggest one model performs better than the other two (Table 6). Both the Tiwanaku model, which posits large scale migration into the Azapa Valley by Middle Period Tiwanaku colonists, and the simple gene flow model -that suggests there Azapa Valley populations gradually changed over time through gene flow and local microevolutionary forces- demonstrate a poor fit (r = 0.23) and non-significant results (p = 0.11) when compared to the matrix of biodistances. On the other hand, the coastal-valley divergent model -a mixed model that posits genetic continuity among the coastal populations with gradual changes among inland agricultural populations via gene flow from the altiplano- produces the best fit (r = 0.43, p = 0.02) when tested against the biodistances using the matrix correlation method. While a correlation of 0.43 for the divergent model may appear low, correlations of this magnitude are not uncommon for comparisons between hypothetical and derived biodistance matrices (González et al. 2001a, b; Sokal et al. 1997; Waddle 1994).
Data presented by this study provide a number of unambiguous results. First, biodistance analyses indicate that none of the Middle Period Azapa Valley mortuary samples are sufficiently similar to the Tiwanaku sample to indicate a Tiwanaku colony was present in the Azapa Valley. On the contrary, with the exception of the terminal Desarrollo Regional Gentilar sample from Azapa-8, all biodistance values for comparisons among Azapa Valley mortuary samples and the Tiwanaku are either significantly different (i.e., comparisons with the Chinchorro, Playa Miller-7, Playa Miller-4, Alto Ramírez, and Azapa-71 samples) or large but nonsignificant (i.e., comparisons with Azapa-140, Azapa-6, and Azapa-75). The biodistance between the Tiwanaku and Azapa-8 samples is relatively small, but does not suggest a direct ancestral-descendant relationship between the two mortuary samples. Instead, these results suggest gradual convergence over time of populations from the interior of the Azapa Valley with the Tiwanaku that is consistent with gene flow, rather than large scale colonization by Tiwanaku colonists. These relationships are apparent both in the biodistance matrix (Table 5) and MDS solution (Figure 4). Coastal populations from the Azapa Valley region apparently maintained a degree of genetic continuity through time following the settlement of the region by the Chinchorros. These conclusions are consistent with those suggested by Sutter (1997; 1999:83; 2000:62; 2005b:193) and Sutter and Mertz (2004:139) who also report a degree of epigenetic continuity among coastal populations from the Azapa Valley using both dental and cranial traits.
In comparative studies that examine dental trait variability among 10 dental traits for 44 prehistoric Andean mortuary samples, Sutter (2005c) suggests that epigenetic changes detected in the northern Chile are likely due to gene flow associated with the increased fertility of agricultural populations in the north and east -a concept referred to as demic expansion- and that the impact of this demic expansion was dramatically reduced by decreased agricultural productivity of coastal valleys in the south central Andes. Indeed, the same Azapa Valley mortuary samples examined by this study are found to be more similar to the Andean Paleoindians and other preceramic mortuary samples from Chile, and Perú (Figure 5).
Matrix correlation analyses of the biodistance matrix against three hypothetical matrices based upon existing models of prehistoric population dynamics for the Azapa Valley provide support for these conclusions. Both the Tiwanaku colonization model and simple gene flow model demonstrate a low and nonsignificant relationship with the biodistances generated by this study (Table 6). The divergent model that suggests both a degree of genetic continuity among coastal populations and gradual changes among the inland populations through gene flow from the altiplano provides the best fit and is significantly related to the biodistance matrix.Importantly, this study only considers three simple models for matrix correlation analysis. Genetic relations are rarely as simply as one imagines and there are a number of additional factors that likely influenced genetic changes through time among Azapa Valley populations. For example, what role did relations with populations from adjacent valleys have with the prehistoric inhabitants from the Azapa Valley? Did other coastal populations intermarry and trade with one another according to Rostworowski's (1976, 1977, 1981) model of horizontal (i.e., coastal) complementarity, thereby accounting for some of the epigenetic changes detected among the Formative Period El Laucho and early Desarrollo Regional Playa Miller-4 mortuary samples (i.e., was their gene flow along the coast that was independent of that detected into the valley from the adjacent altiplano to the east?)? Design matrices can be developed to test these models, but, unfortunately, matrix correlation techniques employed by this study do not permit us to examine these questions without comparative mortuary samples from these regions.
It is difficult to reconcile the results from this study with those that suggest the presence of Tiwanaku colonies in the Azapa Valley during the Middle Period. On the other hand, results presented here provide support for those investigations that posit microevolutionary forces and low levels of gene flow for time as the primary mechanism responsible for genetic changes among prehistoric inhabitants of the Azapa Valley. Both biodistance analysis and matrix correlation analyses fail to support either the Tiwanaku colonization model or simple gene flow model. Rather, the significant relationship between the dentally derived biodistances and divergent model design matrix suggest that prehistoric population dynamics within the Azapa Valley was more subtle and nuanced than suggested by either of the two aforementioned models. Instead, it appears that once the valley was settled by the Archaic Period Chinchorro, this population divided along economic lines with Formative period coastal populations specialized in fishing, while some of the Chinchorro moved inland and became dedicated to practicing agriculture. Subsequently, each of these two Formative Period populations followed slightly different trajectories, with inland populations receiving low levels of gene flow from adjacent altiplano populations from the east, while coastal groups demonstrated a relative degree of genetic continuity relative to their inland neighbors.
It may also be that -if present- any Middle Period Tiwanaku colonies that may have been present in the Azapa Valley are not represented by the mortuary samples analyzed by this study. Indeed, based upon his survey of inland sites, Goldstein (1995) suggests that small Tiwanaku colonies may have existed at the Azapa Valley sites Atoca-1 and Quebrada del Diablo. Human remains are not available for either of these two sites. Importantly, results from this study do not deny the possible existence of altiplano colonists -it is likely that some prehistoric highlanders did, indeed, migrate to the Azapa Valley. Techniques employed by this study, however, do not permit the identification of individuals, but instead use mortuary samples as the unit of study. Other investigators are currently investigating prehistoric migration patterns using strontium isotopes that may eventually provide additional information on prehistoric migratory patterns for the Azapa Valley (Knudson 2004; Knudson et al. 2004). Rather than representing definitive results, the conclusions of this study are preliminary. It is hoped that results presented by this study will provide alternative lines of inquiry and new perspectives on the prehistoric population dynamics of the Azapa Valley.
Acknowledgments: My research in Chile was financially supported by a Fulbright Fellowship. Research in Peru was supported, in part, by a National Science Foundation grant BSN 89 20769 obtained by Jane Buikstra and National Science Foundation grant 9816958 secured by me. I thank my many friends and colleagues of the Museo Arqueológico San Miguel de Azapa, Chile. The Museo Arqueológico San Miguel de Azapa of the Universidad de Tarapacá provided key facilities and logistic support for my research in Chile. I am grateful to my many colleagues who allowed me to examine unpublished site reports, field notes and/or skeletal and artifact collections, particularly Ivan Muñoz, and the late Guillermo Focacci. This manuscript greatly benefited from conversations I had with Mariela Santos, Luis Briones, Juan Chacama, Liliana Ulloa, Paul Goldstein, Sonia Guillén, Gerardo Carpio Díaz, Adán Umire, Ana Miranda Quispe, Bernardo Arriaza, Vicki Cassman, Rick Reycraft, Deborah Blom, María Cecilia Lozada, Debbie Pearsall, and the late Percy Dauelsberg and Guillermo Focacci. I also thank my wife, Claudia Encalada Santos, for editing the Spanish version of this paper's abstract. Any errors of fact or interpretation are my own.
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Recibido: febrero 2005. Aceptado: enero 2006.