This thesis explores the seemingly simple problem of how a rainforest-dwelling primate, Cebus apella libidinosus, manages to survive in the Caatinga dry forest of north-eastern Brazil, a harsh habitat that poses a series of extreme ecological challenges for survival. Albeit a simple question, it unfolds into more complex questions regarding how ecological pressures might drive brain evolution and intelligence in primates. Although there is no "best" hypothesis to explain the evolutionary brain enlargement in higher primates, fine-grained analyses of ecology, such as those presented here provide insights into how different species deal with ecological problems that might require cognitive solutions. Capuchin monkeys are an ideal model for this inquiry. They occupy diverse habitats, and they have proven to be a cognitive puzzle. They are the only monkey to approach great apes in their ability to use tools, but apparently lack the prerequisite mental capability to understand cause and effect. The Caatinga dry forest poses a series of ecological challenges for mammals in general and primates in particular, and these are detailed in this thesis. This is the first general study of mammalian abundance and distribution in Caatinga habitats, with special reference to Cebus. I present several innovative methods for assessing plant and invertebrate biodiversity, as regards foods for the Cebus. The study population of capuchin monkeys faced more frequent and longer periods of food scarcity than does any other known capuchin population. However, the Cebus in the Caatinga circumvent the ecological constraints of low plant food availability through their proficient foraging style (destructive foraging) and through their cognitive abilities, reflected in this population's extensive and intelligent use of technology. I suggest that Old World monkeys and capuchin monkeys have undergone differential selective pressures, with 'Machiavellian intelligence' being a more prominent aspect in the brain evolution of baboons and macaques, while extractive foraging was a more important selective pressure for capuchin monkeys. The evolutionary brain enlargement observed in hominids is suggested to be a legacy of extractive foraging and that capuchin monkeys are excellent models for understanding the factors leading to brain enlargement. This thesis is concluded as an endeavour into understanding the selective forces and concatenation of events that culminated with the evolutionary brain enlargement seen in the hominins.

Social stratification is a major area of thought in theoretical social analysis. Although much has since been said in this area, the theories of social stratification put forward by Karl Marx remain fundamental. The necessity for a social class to possess class consciousness is basic to Marx’ theories. A middle social stratum has been rapidly growing in Brazil since the Second World War. This expansion is due to the growth of industry, urban centers, government bureaucracy, and other factors. Yet, this middle group seems to lack both an awareness of themselves as a group and a unique set of values. To some extent, the middle stratum identifies with the upper class. Clearly, the middle stratum lacks class consciousness. For this reason I refer to this group as the middle sector. The problem is: why does Brazil's middle sector lack class consciousness? The hypothesis I propose in solution to this problem is as follows: Brazil's middle sector is, in a sense, a misfit in the stream of Brazilian history. In more than four centuries of European settlement of Brazil, the society has been characterized by factors contributing to a bi-polar tendency in social stratification. In testing this hypothesis, I will examine three of the areas of factors in terms of the roles they have played in social stratification. Although the list of areas contributing to a bi-polar tendency is long, I have limited myself to the economic factor, the kinship factor, and the racial factor. These three factors will be examined throughout the course of Brazilian history. The economic structure has been largely characterized by large-scale agriculture, feudalism, and slavery. These institutions involve the control of the many by the few. Two contemporary phenomena which polarize Brazilian society have come out of this heritage: paternalistic treatment of employees, and the concentration of wealth in the hands of a relatively few. The kinship system has strengthened the bi-polar tendency in several ways. The aristocratic patriarchal family, which dominated Brazil for centuries, served to maintain the position of the upper class, and establish a dependency of the poor on the rich. The upper-class family continues today as a maintainer of the status quo. The institutions of patronship and godparenthood continue today to foster a dependency of poor on rich. Perhaps the most obvious contribution to the bi-polar tendency is seen in the historical role of the racial factor. Slavery existed from the founding of the colony until abolition in 1888. Masters were white and slaves were non-white. The non-white population continues to largely occupy the lower class, and this situation is maintained by often-subtle racial prejudice. To gain an understanding of the growth of the middle sector, a fourth factor must be noted: demographic changes. Recent phenomena are extensive European immigration, and the development of urban centers. The recent nature of these phenomena is linked to the recent growth of the middle sector. Although Brazilian society continues, in many ways, to be bi-polar, the existence of a relatively large middle sector prohibits a perfect bi-polarity in social stratification. The existence of the middle sector may be a misfit in Brazilian history in one sense, but this sector's values do not run counter to the historical flow. However, the middle sector is yet in an early stage of development. A later stage of development may include the formation of a class consciousness. / Arts, Faculty of / Anthropology, Department of / Graduate

included 24-hour food recalls, infant feeding practices, women's food preferences and frequency of food intake. Anthropometry consisted of weight, height, mid-upper-arm circumference (MUAC), and triceps skinfold (TSF) thickness measurements in women and children, with additional head circumference measurements in children less than 3 years. Major findings from dietary assessment revealed that adult diets were simplistic, consisting primarily of rice, beans, and coffee (with sugar). Analysis of nutrient intake and comparison with international standards showed that women were probably at high risk for vitamin A, iron, calcium, ascorbic acid, and riboflavin deficiencies; children appeared at high risk for vitamin A, iron, and ascorbic acid deficiencies. Infant feeding practices indicated that all children (under 5 years) had been breast fed at birth, although many were weaned at an early age. Negative nutritional infant feeding practices were reported, especially for conditions such as fever and diarrhoea. Belief in the "hot/cold" food classification system was reported by women. Although food taboos were reported for menstruation, pregnancy, immediately post partum, and lactation, relatively few taboos had potentially negative nutritional consequences. Anthropometric assessment indicated that a significant number of women were probably undernourished; a small percentage of women, however, were overweight or obese. Children did not generally appear undernourished; many, however, were stunted in growth. Summative evaluation of the nutrition education program indicated that for women who participated in the program, nutrition knowledge scores showed improvement and were statistically significant at ∝ =.05, using Wilcoxon signed rank test. / Land and Food Systems, Faculty of / Graduate

A study was conducted to investigate and compare the nutritional status and physical work performance of children of Brazilian migrant agricultural workers with Brazilian children from wel1-to-do backgrounds. The relationship between nutritional status and physical work performance was also investigated. Dietary analysis was conducted using the 24-hour diet recall method. Evidence was found that intakes of energy, calcium, thiamin, riboflavin, niacin, and vitamin C may have been inadequate among migrant worker children. Their diet was generally monotonous and consisted mainly of rice, beans, and coffee with sugar. Diets of well-to-do children were considerably more varied with good representation from all major food groups. Anthropometric assessment indicated that migrant worker children had values for weight and triceps skinfold thickness that were low compared to American standards. Values for height, arm circumference, and arm muscle circumference were average compared to American standards. Well-to-do children exceeded American standards for all anthropometric parameters measured. Biochemical investigations of protein and iron status were also conducted. Serum total protein and albumin levels were normal in most subjects in both groups. However, many migrant worker, children had low values for hematocrit, serum iron, and transferrin saturation. Most well-to-do children had normal values for these parameters. Hemoglobin levels were adequate in most subjects. Physical work performance was found to be impaired in migrant worker children. Exercise heart rates and post-exercise blood lactic acid levels in response to a standardized bicycle-ergometer work test were significantly higher in migrant worker compared to wel1-to-do children. In addition, a significant correlation was found between anthropometric indicators of nutritional status and parameters of physical work performance. Finally, socio-economic and ecological assessment indicated that the living conditions of migrant worker children were impoverished and unsanitary. This probably aggravated health problems such as infections that were found to occur among these children. Well-to-do children did not share these conditions. / Land and Food Systems, Faculty of / Graduate

archives@tulane.edu / 1 / Dominique Dollenmayer

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