Biological and Physical Anthropology Commons^™

Variation Among Populations In The Immune Protein Composition Of Mother's Milk Reflects Subsistence Pattern, Laura D. Klein, Jincui Huang, Elizabeth A. Quinn, Melanie A. Martin, Alicia A. Breakey, Michael Gurven, Hillard Kaplan, Claudia Valeggia, Grazyna Jasienska, Brooke Scelza, Carlito B. Lebrilla, Katie Hinde

ESI Publications

Lay Summary: Adaptive immune proteins in mothers’ milk are more variable than innate immune proteins across populations and subsistence strategies. These results suggest that the immune defenses in milk are shaped by a mother’s environment throughout her life.

Background and objectives: Mother’s milk contains immune proteins that play critical roles in protecting the infant from infection and priming the infant’s developing immune system during early life. The composition of these molecules in milk, particularly the acquired immune proteins, is thought to reflect a mother’s immunological exposures throughout her life. In this study, we examine the composition of innate …

Marital Violence And Fertility In A Relatively Egalitarian High-Fertility Population, Jonathan Stieglitz, Benjamin C. Trumble, Hillard Kaplan, Michael Gurven

ESI Publications

Ultimate and proximate explanations of men’s physical intimate partner violence (IPV) against women have been proposed. An ultimate explanation posits that IPV is used to achieve a selfish fitness-relevant outcome, and predicts that IPV is associated with greater marital fertility. Proximate IPV explanations contain either complementary strategic components (for example, men’s desire for partner control), non-strategic components (for example, men’s self-regulatory failure), or both strategic and non-strategic components involving social learning. Consistent with an expectation from an ultimate IPV explanation, we find that IPV predicts greater marital fertility among Tsimané forager-horticulturalists of Bolivia (n = 133 marriages, 105 women). This …

Correction To: 'Greater Wealth Inequality, Less Polygyny: Rethinking The Polygyny Threshold Model', Cody T. Ross, Monique Borgerhoff Mulder, Seung-Yun Oh, Samuel Bowles, Bret Beheim, John Bunce, Mark Caudell, Gregory Clark, Heidi Colleran, Carmen Cortez, Patricia Draper, Russell D. Greaves, Michael Gurven, Thomas Headland, Janet Headland, Kim Hill, Barry Hewlett, Hillard Kaplan, Jeremy Koster, Karen Kramer, Frank Marlowe, Richard Mcelereath, David Nolin, Marsha Quinlan, Robert Quinlan, Caissa Revilla-Minaya, Brooke Scelza, Ryan Schacht, Mary Shenk, Ray Uehara, Eckart Voland, Kai Willführ, Bruce Winterhalder, John Ziker, Christopher Von Rueden

ESI Publications

No abstract provided.

Greater Wealth Inequality, Less Polygyny: Rethinking The Polygyny Threshold Model, Cody T. Ross, Monique Borgerhoff Mulder, Seung-Yun Oh, Samuel Bowles, Bret Beheim, John Bunce, Mark Caudell, Gregory Clark, Heidi Colleran, Carmen Cortez, Patricia Draper, Russell D. Greaves, Michael Gurven, Thomas Headland, Janet Headland, Kim Hill, Barry Hewlett, Hillard Kaplan, Jeremy Koster, Karen Kramer, Frank Marlowe, Richard Mcelreath, David Nolin, Marsha Quinlan, Robert Quinlan, Caissa Revilla-Minaya, Brooke Scelza, Ryan Schacht, Mary Shenk, Ray Uehara, Eckart Voland, Kai Willführ, Bruce Winterhalder, John Ziker, Christopher Von Rueden

ESI Publications

Monogamy appears to have become the predominant human mating system with the emergence of highly unequal agricultural populations that replaced relatively egalitarian horticultural populations, challenging the conventional idea—based on the polygyny threshold model—that polygyny should be positively associated with wealth inequality. To address this polygyny paradox, we generalize the standard polygyny threshold model to a mutual mate choice model predicting the fraction of women married polygynously. We then demonstrate two conditions that are jointly sufficient to make monogamy the predominant marriage form, even in highly unequal societies. We assess if these conditions are satisfied using individual-level data from 29 human …

Missing The Point: Identifying Perishable Projectiles In The Archaeological Record From Bone Damage, Sara R. Wingert

Honors Student Research

For decades, archaeologists have used replicative studies to develop a better understanding of prehistoric technology. Many replicative studies have focused on the manufacture and use of stone projectiles, resulting in a detailed understanding of the design of hunting weapons in relation to various features of the environment and, in turn, elegant explanations for technological change over time. Yet if ethnographic accounts are any indication, lithic technology was only one (perhaps minor) part of many prehistoric technological systems. It is likely, then, that the technological changes archaeologists commonly document through their morphometric analysis of stone projectile points occurred against a backdrop …

Sex Differences In Political Leadership In An Egalitarian Society, Christopher Von Rueden, Sarah Alami, Hillard Kaplan, Michael Gurven

ESI Publications

We test the contribution of sex differences in physical formidability, education, and cooperation to the acquisition of political leadership in a small-scale society. Among forager-farmers from the Bolivian Amazon, we find that men are more likely to exercise different forms of political leadership, including verbal influence during community meetings, coordination of community projects, and dispute resolution. We show that these differences in leadership are not due to gender per se but are associated with men’s greater number of cooperation partners, greater access to schooling, and greater body size and physical strength. Men’s advantage in cooperation partner number is tied to …

Low Perceived Control Over Health Is Associated With Lower Treatment Uptake In A High Mortality Population Of Bolivian Forager-Farmers, Sarah Alami, Jonathan Stieglitz, Hillard Kaplan, Michael Gurven

ESI Publications

Indigenous people worldwide suffer from higher rates of morbidity and mortality than neighboring populations. In addition to having limited access to public health infrastructure, indigenous people may also have priorities and health perceptions that deter them from seeking adequate modern healthcare. Here we propose that living in a harsh and unpredictable environment reduces motivation to pursue deliberate, costly action to improve health outcomes. We assess whether variation in Health Locus of Control (HLC), a psychological construct designed to capture self-efficacy with respect to health, explains variation in treatment uptake behavior among Tsimane Amerindians (N=690; age range: 40–89 years; 55.8% female; …

"Back" To The Future: An Evaluation Of Morphological Integration In Kyphosis, Kristyna L. Ceuninck

Honors Undergraduate Theses

Morphological integration refers to the interdependence of two or more phenotypic structures. The morphological integration concept is based on the fact that parts of complex organisms do not vary randomly and instead display degrees of non-independence that are thought to occur from shared genetic or developmental origins, and/or functional demands. Integrated traits may develop, evolve, and be inherited together. One instance of morphological integration can be found between the vertebral column and the skull. Due to the position of the skull resting atop of the vertebral column, posture may influence skull development and overall craniofacial morphology. Morphological integration within or …

Feeding The Children: A Paleodietary Reconstruction Of Juveniles From Kuelap, Peru, Marley Denierio

Honors Undergraduate Theses

Before reaching adulthood, every individual experiences a period of dependency, the juvenile period, during which they rely on the older, more experienced members of their society for their security, subsistence and care. This juvenile period is an important stage of life for human physical and physiological development. In bioarchaeology, there has been limited research conducted on juveniles, particularly, the development of their own social identity and influences. The research method of stable carbon (C) and nitrogen (N) isotope analysis is used to reconstruct the paleodiet of juveniles to determine their dietary composition. Specifically, this research is focused on Kuelap, located …

The Effects Of Common Methods Of Soft Tissue Removal On Skeletal Remains: A Comparative Analysis, Emily Silverman

Graduate Student Theses, Dissertations, & Professional Papers

The removal of soft tissue from skeletal remains is a process familiar to a wide array of scientific fields and the methods used to perform it are likewise numerous yet inconsistent. In forensic investigations and crime labs across the country, there lacks a standardization for this process. This lack of standardization pairs with a distinct lack of literature on the potential benefits and risks associated with each method as well as basic information on the proper amount of additives, temperatures, or time estimations. In a forensic context, human remains may be the only evidence available, which makes any damage or …

The Effects Of Common Methods Of Soft Tissue Removal On Skeletal Remains: A Comparative Analysis, Emily Silverman

Graduate Student Theses, Dissertations, & Professional Papers

The removal of soft tissue from skeletal remains is a process familiar to a wide array of scientific fields and the methods used to perform it are likewise numerous yet inconsistent. In forensic investigations and crime labs across the country, there lacks a standardization for this process. This lack of standardization pairs with a distinct lack of literature on the potential benefits and risks associated with each method as well as basic information on the proper amount of additives, temperatures, or time estimations. In a forensic context, human remains may be the only evidence available, which makes any damage or …

Pig Trauma Models: A Civilian Perspective On Ar-15 Post-Cranial Skeletal Trauma, Lauren M. Kenney

Graduate Student Theses, Dissertations, & Professional Papers

In the last decade, our country has seen an unprecedented wave of terror that has been punctuated by increasing events of gun-related violence. Consequently, the use of firearms against civilians or upon targets containing civilians has inevitably had a direct impact on the health of the individuals affected, and in many cases these events have concluded with mass number fatalities. The driving force for this research falls to the lack of available literature regarding traumatic skeletal injuries associated with high-velocity firearms outside of realm of the military. The effects of these types of weapons on civilians, which result from their …