The Aymara of Western Bolivia. II. Maxillofacial and dental arch variation

Maxillofacial and dental arch dimensions of the Bolivian Aymara population are age and sex dependent. Interpopulational comparisons reveal these dimensions to differ from those seen in Aleuts, Australian aborigines, and Swedes, but to be similar to those of the indigenous Taiwanese. Finally, these dimensions are not the same in Aymara of unmixed ancestry, and Mestizos residing in the same villages.     

Hemoglobin concentration of high-altitude Tibetans and Bolivian Aymara

Elevated hemoglobin concentrations have been reported for high-altitude sojourners and Andean high-altitude natives since early in the 20th century. Thus, reports that have appeared since the 1970s describing relatively low hemoglobin concentration among Tibetan high-altitude natives were unexpected. These suggested a hypothesis of population differences in hematological response to high-altitude hypoxia. A case of quantitatively different responses to one environmental stress would offer an opportunity to study the broad evolutionary question of the origin of adaptations. However, many factors may confound population comparisons. The present study was designed to test the null hypothesis of no difference in mean hemoglobin concentration of Tibetan and Aymara native residents at 3,800–4,065 meters by using healthy samples that were screened for iron deficiency, abnormal hemoglobins, and thalassemias, recruited and assessed using the same techniques. The hypothesis was rejected, because Tibetan males had a significantly lower mean hemoglobin concentration of 15.6 gm/dl compared with 19.2 gm/dl for Aymara males, and Tibetan females had a mean hemoglobin concentration of 14.2 gm/dl compared with 17.8 gm/dl for Aymara females. The Tibetan hemoglobin distribution closely resembled that from a comparable, sea-level sample from the United States, whereas the Aymara distribution was shifted toward 3–4 gm/dl higher values. Genetic factors accounted for a very high proportion of the phenotypic variance in hemoglobin concentration in both samples (0.86 in the Tibetan sample and 0.87 in the Aymara sample). The presence of significant genetic variance means that there is the potential for natural selection and genetic adaptation of hemoglobin concentration in Tibetan and Aymara high-altitude populations. Am J Phys Anthropol 106:385–400, 1998. © 1998 Wiley-Liss, Inc.     

Color blindness among Aymara in Chile

Nine color blind subjects were discovered in a survey of 140 Aymaras of Arica, Chile, using as screening test a portable Anomaloscope, Ishihara tables and Hardy-Rand-Ritter plates. Pseudosisochromatic test failed on detecting four anomalous trichromates. Seven color blind subjects revealed foreign ancestors. Also a different prevalence of defectives among subsamples was observed. Thus color blindness variability within the sample could be explained by gene flow. It is proposed to use anomaloscopes as a screening device in order to survey with accuracy color vision genes in human populations.     

Physical growth of Aymara children in a herding community of the Bolivian Altiplano.

In a small agropastoral Aymara community called Wariscata in the Andean Altiplano of Bolivia, anthropometric measurements were made in 1988. In comparison with those of published data for the other rural and urban Andean populations (Aymara, Quechua and Mestizo at high and low altitudes), the Aymara children of Wariscata were taller and heavier than other rural high altitude native children, but similar in height to urban high altitude children. This is possibly due to secular change of growth accompanied with nutritional improvement that has taken place in recent years. Chest width and depth had similar values to those in other Aymara children. But, Aymara children in Wariscata of both sexes had smaller chest dimensions (depth and width) than those of Quechua children. However, these ethnic differences in chest dimensions were not reflected in the adult Aymara and Quechua, suggesting different process of chest growth in Aymara and Quechua populations.     

Pulmonary vascular remodelling in a high-altitude Aymara Indian

A histological study of the pulmonary vasculature in a young male high-altitude Aymara Indian revealed four aspects of interest. There was muscularization of the terminal portion of the pulmonary arterial tree to involve pulmonary arterioles as small as 15 m in diameter, thus forming a basis for the slightly increased pulmonary vascular resistance of native highlanders. Intimal longitudinal muscle was found in pulmonary arteries and arterioles and thought to be due to chronic alveolar hypoxia. Inner muscular tubes similar to those found in chronic obstructive lung disease were present. Pulmonary veins and venules also showed intimal muscularization suggesting that alveolar hypoxia affects vascular smooth muscle cells per se irrespective of their situation. The nature of the remodelling in a pulmonary blood vessel depends on a combination of hypoxia and haemodynamics.     

Ethnicity determination by names among the Aymara of Chile and Bolivia

The importance of surnames in genetic studies has been recognized for a century or so. While the ethnic affiliations of individuals are ordinarily established in genetic studies by admixture analysis based on gene frequencies, often there are implicit assumptions in these attempts that are difficult to validate in the absence of detailed ethnohistories. In northern Chile and western Bolivia, where genetic admixture has been known to occur among the Aymara Indians and Spanish Caucasoids, the naming pattern (parental patriand matrinyms) allowed us to classify individuals on the basis of the frequency of Aymara names into 9 'ethnic' groups. From a sample of 2525 individuals it is shown that admixture occurred in lineages nonrandomly, implying assortative mating of surnames. Admixture and genetic distance analysis on the basis of 31 genetic markers on approximately 1700 of these individuals reveals that there is a reasonable agreement of ethnic classification of individuals by name and phenotype data on genetic markers. The Aymara-named groups are shown to be predominantly Amerindian (89%) in their genetic profiles. Individuals whose current naming pattern is basically Spanish also exhibit a substantial fraction of genes of Amerindian origin (67%). Presence of some rare alleles not found in Amerindian or Spanish Caucasoids in the admixed groups suggest infiltration of Negroid genes in the past.     

Ideologies of Language: Some Reflections on Language and U.S. Law

I present two U.S. court cases in which I participated as a linguistic anthropological "expert" to show how language ideologies of the law both influence legal outcomes and conflict with "scientific" ideas about language. One case was the murder trial of a young Mixtec-speaking Indian from Oaxaca; the other was a civil suit brought by four Hispanic women dismissed from an elder-care center for speaking Spanish on the job. I identify in the linguistic ideologies of both cases a principle of "referential transparency" that takes the essential business of words, regardless of the linguistic code, to be communicating propositional information. In the second case, 1 describe a further notion of "linguistic paranoia" in which speaking a language other than English is taken as inherently insulting or threatening. I relate these implicit ideological threads to the legal outcomes, to the restricted notions of potential "language rights" that might emerge from such ideologies, and to the clash between theoretical and judicial perspectives on language. [Keywords: U.S. law, language rights, linguistic ideology, expert witnesses, linguistic anthropology]     

The physical growth of high altitude Bolivian Aymara children

This study describes the growth characteristics of Aymara children living in Ancoraimes, Bolivia at altitudes between 3800 and 4000 meters. Anthropometric measurements were made on 510 children between the ages of 6. 0 and 20. 9 years, 360 males and 150 females. The growth pattern of Ancoraimes Aymara children is very similar to that of other high altitude Andean populations. They are greatly delayed in height and weight, exhibit little sexual dimorphism in body size and relative to stature, have larger chest dimensions than U.S. children. Compared to Quechua children living at higher altitudes in Peru, Ancoraimes children tend to be taller and heavier but have significantly smaller chest dimensions. Although the causes of the size differences between these two groups are not entirely clear, they may be due to the different altitudes at which the groups reside.     

Ventilation and hypoxic ventilatory response of Tibetan and Aymara high altitude natives

Newcomers acclimatizing to high altitude and adult male Tibetan high altitude natives have increased ventilation relative to sea level natives at sea level. However, Andean and Rocky Mountain high altitude natives have an intermediate level of ventilation lower than that of newcomers and Tibetan high altitude natives although generally higher than that of sea level natives at sea level. Because the reason for the relative hypoventilation of some high altitude native populations was unknown, a study was designed to describe ventilation from adolescence through old age in samples of Tibetan and Andean high altitude natives and to estimate the relative genetic and environmental influences. This paper compares resting ventilation and hypoxic ventilatory response (HVR) of 320 Tibetans 9–82 years of age and 542 Bolivian Aymara 13–94 years of age, native residents at 3,800–4,065 m. Tibetan resting ventilation was roughly 1.5 times higher and Tibetan HVR was roughly double that of Aymara. Greater duration of hypoxia (older age) was not an important source of variation in resting ventilation or HVR in either sample. That is, contrary to previous studies, neither sample acquired hypoventilation in the age ranges under study. Within populations, greater severity of hypoxia (lower percent of oxygen saturation of arterial hemoglobin) was associated with slightly higher resting ventilation among Tibetans and lower resting ventilation and HVR among Aymara women, although the associations accounted for just 2–7% of the variation. Between populations, the Tibetan sample was more hypoxic and had higher resting ventilation and HVR. Other systematic environmental contrasts did not appear to elevate Tibetan or depress Aymara ventilation. There was more intrapopulation genetic variation in these traits in the Tibetan than the Aymara sample. Thirty-five percent of the Tibetan, but none of the Aymara, resting ventilation variance was due to genetic differences among individuals. Thirty-one percent of the Tibetan HVR, but just 21% of the Aymara, HVR variance was due to genetic differences among individuals. Thus there is greater potential for evolutionary change in these traits in the Tibetans. Presently, there are two different ventilation phenotypes among high altitude natives as compared with sea level populations at sea level: lifelong sustained high resting ventilation and a moderate HVR among Tibetans in contrast with a slightly elevated resting ventilation and a low HVR among Aymara. Am J Phys Anthropol 104:427–447, 1997. © 1997 Wiley-Liss, Inc.     

Daring to Change: The Potential of Intercultural Education in Aymara Communities in Chile

The following article presents a project in teacher training in northern Chile that was meant to provoke an attitudinal change toward native culture among rural school teachers working in one Aymara district. In keeping with participatory research methods, the project also sought to probe into the dynamics at play in the teachers' position. The conclusions drawn from this experience suggest that hegemonic barriers stand in the way of broadening the scope of intercultural education in plural, democratic societies.     

The Aymara of Western Bolivia. IV. Gene frequencies for eight blood groups and 19 protein and erythrocyte enzyme systems.

A total of 315 individuals, mainly of Aymara origin, from western Bolivia were examined for genetic variation at eight red cell antigen and 19 serum protein and red cell enzyme loci. The gene frequencies for polymorphic loci and the discovery of several rare variants are discussed in terms of previous work among the Aymara and the closely related Quechua. The effect of inclusion of related individuals in the sample on gene frequency, variance of gene frequency and genetic distance, is discussed.     

Language Ideologies: Practice and Theory.

Language Ideologies: Practice and Theory. Bambi B. Schieffelin. Kathryn A. Woolard. and Paul V. Kroskrity. eds. New York: Oxford University Press, 1998. 338 pp.