Biological and Physical Anthropology Commons^™

Understanding The Environmental And Genetic Influence On Fluctuating Asymmetry And Developmental Instability In Primates, Ashly N. Romero

Graduate Theses and Dissertations

This dissertation explored the impact of environmental factors on the development and perpetuation of fluctuating asymmetry (FA) and sought to understand the role evolution may play in the FA exhibited in two primate populations: the free-ranging Cayo Santiago rhesus macaques (Macaca mulatta) and the Southwest National Primate Research Center olive baboons (Papio hamadryas anubis). Demographic, ontogenetic, secular, external, and genetic factors were examined. Specifically, this dissertation investigated FA over all ontogenetic stages, across decades, between sexes, in association with ecological catastrophes, and with tooth pathology to try and tease apart factors that may influence FA and developmental instability. This dissertation …

Dental Calculus: Future In Forensics, Emily Elgin

Chancellor’s Honors Program Projects

No abstract provided.

Sphenoidal Sinuses And Spherical Harmonics: Variation And Covariation Of The Most Morphologically Diverse And Least Understood Paranasal Sinus, Katharine Grace Josephine Ryan

Doctoral Dissertations

Understanding the shape variation of the human sphenoidal sinus is important to several areas of research. This includes clinical investigation (sinus pathology and safe endoscopic endonasal surgical practice) and paranasal sinus evolution (for which there is still no consensus). Yet, the sphenoidal sinus has high morphological variation, prohibiting its quantification through traditional geometric morphometric landmarking methods. The sphenoid body, and thus also the sinus contained within, is located directly at the developmental center of the basicranium in humans, where the three cranial fossae meet at the midline, and adjacent to the three synchondroses which are the sites of cranial base …

Quantification Of Dental Fissures Through Occlusal Topography Analysis, Duru Erkan

Biological Sciences Undergraduate Honors Theses

Narrow, deep, and elaborate dental fissures are widely believed to increase the predisposition of enamel to develop carious lesions as these surfaces are thought to be ideal for cariogenic bacteria to adhere to. Therefore, dentists prescribe sealants as a preventative measure for patients with such fissures to avoid tooth decay. Yet to date, there is no objective data supporting the notion that fissure morphology actually affects caries susceptibility, nor is there a quantifiable, clinically practical method to characterize fissure patterns expected to increase risk of caries disease.

In this study, three new methods to quantitatively characterize fissure pattern in mandibular …

The Impact Of Energetic Trade-Offs On The Developmental Trajectory And Life History Strategy Of Homo Sapiens: The Modern Human Female Phenotype, Laura Ann Hope Atkinson

Electronic Thesis and Dissertation Repository

This study interrogates the relationship between early life environmental variability (measured through birth weight and age at menarche), and adult phenotypic outcomes in female athletes and non-athletes from the United Kingdom. Using anthropometric, and 3D body surface scan analysis, patterns of phenotypic variation were interpreted in a life history context. Significant correlations between birth weight, stature, and bi-iliac breadth were observed. Age at menarche had significant correlations with linear growth and body composition measures in both Pearson and Canonical Correlation analyses. Crural index was found to be negatively correlated with limb segment SA:Vol in opposition to the expectations of Allen’s …

Diversity And Evolution Of Human Eccrine Sweat Gland Density, Andrew W. Best

Doctoral Dissertations

Human eccrine density is highly derived. However, little is known about contemporary variation in this trait, what shapes it, and how it influences heat dissipation. This project explores 3 questions: 1) Is variation in functional eccrine density (FED) explained by childhood climate? 2) Is this variation patterned by geographic ancestry? 3) Is variation in FED associated with differences in heat dissipation capacity? We measured FED and sweat production in 6 body areas via pharmacological stimulation and impressions of sweating skin in 72 participants. Childhood climate variables were taken from the WorldClim database and geographic ancestry was estimated with 23andMe tests. …

Factors Influencing Primate Hair Microbiome Diversity, Catherine Kitrinos

Masters Theses

Primate hair is both a substrate upon which essential social interactions occur and an important host-pathogen interface. As commensal microbes provide important immune functions for their hosts, understanding the microbial diversity in primate hair could provide insight into primate immunity and disease transmission. While studies of human hair and skin microbiomes show differences in microbial communities across body regions, little is known about the nonhuman primate hair microbiome. In this study, we collected hair samples (n=159) from 8 body regions across 12 nonhuman primate species housed at 3 US institutions to examine 1) the diversity and composition of the primate …

The Evolution Of Sex Differences In Mandrills (Mandrillus Sphinx): Micro- And Macroevolution, Jerred Klint Schafer

Legacy Theses & Dissertations (2009 - 2024)

Primates show diverse patterns of adaptive color and body size dimorphism produced by inter- and intrasexual selection. However, the specific microevolutionary processes that produce variation in secondary sexual characteristics remain largely unexplored in primates. Furthermore, sexual conflict theory predicts that female and male secondary sexual traits can coevolve in an antagonistic manner and promote speciation. This dissertation explores the microevolution of secondary sexual characteristics in mandrills (Mandrillus sphinx) and the macroevolution of these characters in anthropoid primates. I address the microevolution of mandrill facial coloration and body mass by estimating the heritability, phenotypic selection, and genetic evolution of these traits …

Intergenerational Embodiment Of Stress : How The Broader Sociocultural Environment Can Shape Child Growth And Development, Elizabeth A. Holdsworth

Legacy Theses & Dissertations (2009 - 2024)

Childhood growth has been a means of identifying systemic, material inequalities within populations. The plasticity of growth is responsive to multiple environmental factors, most notably adequate nutrition, but also psychosocial stress. Psychosocial stress can be a function of the social and political economic ecology, reinforcing power hierarchies within societies. This dissertation proposes that childhood growth can also reflect inequality in the distribution of psychosocial stress exposure through mothers’ feelings of a chronically stressful environment conveyed through maternal-infant interactions.

De-Coding The Impact Of Evolved Changes In Gene Expression And Cellular Phenotype On Primate Evolution, Trisha Zintel

Doctoral Dissertations

The goal of the dissertation work outlined here was to investigate the influence of proximal processes contributing to evolutionary differences in phenotypes among primate species. There are numerous previous comparative analyses of gene expression between primate brain regions. However, primate brain tissue samples are relatively rare, and my results have contributed to the pre-existing data on more well-studied primates (i.e. humans, chimpanzees, macaques, marmosets) as well as produced information on more rarely-studied primates (i.e. patas monkey, siamang, spider monkey). Additionally, the primary visual cortex has not previously been as extensively studied at the level of gene expression as other brain …

Assessing Methods For Estimating Biological Sex From Subadult Skeletal Elements, Dorota Zabnicka

Cal Poly Humboldt theses and projects

While methods for estimating the sex of adult skeletons are relatively accurate, these methods are often inconclusive when applied to subadults (non-adults), especially when many secondary sexual characteristics have not fully developed. Furthermore, existing methods for subadults are often tested on samples with relatively homogenous ancestries, calling into question their reliability in more diverse populations. This thesis reviewed techniques for estimating sex in subadult skeletal remains, and the most promising methods were retested on individuals of known sex between ages 3 and 17 years (n=39, 14 males, 25 females) from the Hamann-Todd Osteological Collection. Data collection included measurements of the …

Group Differences In Mother-Infant Macaca Fascicularis Behavior, Parasite Load, And Body Condition Within An Anthropogenically Altered Forest, Elizabeth M.C. Coggeshall

All Master's Theses

This study aimed to establish preliminary health and behavioral data, as well as understand group variation for a large population of Macaca fascicularis individuals within an anthropogenically altered monkey forest. A parasitic analysis of 40 mother and infant individuals showed that M. fascicularis carried 13 different parasitic taxa, and that there was parasitic variation between groups. Body condition scores were determined using a newly created and adapted body condition scale from 146 sampled mother macaques. Body condition scores were significantly different between groups, specifically the pond group when compared to the three other groups. Mother-infant behavioral differences were seen between …

Effects Of Habitat Disturbance On The Teeth Of Propithecus Diadema In The Forests Of Tsinjoarivo, Madagascar: Implications For Species Viability And Conservation, Katie Susann Heffernan

Graduate Research Theses & Dissertations

The accelerated transformation of Madagascar’s ecosystems is a direct result of habitat destruction which has devastating consequences for the viability of the island’s animals. This dissertation focuses on the critically endangered diademed sifaka, Propithecus diadema, living in the rainforests of Tsinjoarivo, Madagascar. Tsinjoarivo has been heavily impacted by slash and burn agriculture and transformed into isolated forest fragments. Previous research by Irwin and colleagues has demonstrated that the diet and group dynamics of Propithecus diadema differ between continuous and degraded forests, but whether fragmented landscapes provide tougher foods and lead to behavioral changes through increased tooth wear has not been …

Costs Of Group Locomotion: How Infant-Carrying And Group Members Mediate Walking Speed Decisions In North American And East African Populations, Leah M. Bouterse

Honors Projects

A major portion of humans’ activity-based energy expenditure is taken up by locomotion, particularly walking. Humans can offset the energetic expenditure of walking in numerous ways, both evolutionary (such as changes in body shape) and culturally. Behaviorally, people can choose to walk in a variety of ways, including alone or with a group, carrying loads, and walking quickly or more slowly. All of these behaviors have energetic outcomes and as such can be important windows into how populations and groups adjust to different constraints. While sex differences in speed of paired walkers have been established by others, the dynamics of …

A Quantitative Genetic Analysis Of Craniofacial Variation In Baboons, Jessica Lynn Joganic

Arts & Sciences Electronic Theses and Dissertations

This dissertation is an explication of baboon craniofacial variation and its genetic basis. Intraspecific variation is the result of input from and complex interactions among genetic information, functional demands, and developmental processes. The relative effect of each of these on craniofacial variation, as well as the degree of inter-trait covariance, determines whether traits can respond to selection and what that response might look like. Using a sample of pedigreed baboons, I quantify craniofacial variation to address specific questions regarding the distribution and magnitude of phenotypic, genetic, and environmental variation patterns. In addition, I identify regions of the genome containing genetic …

Examination Of Age Estimation Of The Sternal Rib Ends In The Third And Fourth Left Ribs, Arleigh Jones

Chancellor’s Honors Program Projects

No abstract provided.

Dietary Adaptations And Intra- And Interspecific Variation In Dental Occlusal Shape In Hominin And Non-Hominin Primates, Kelsey O'Neill

Theses and Dissertations

Dental morphology and tooth shape have been used to recreate the

dietary adaptations for extinct species, and thus dental variation can provide

information on the relationship between fossil species and their

paleoenvironments. Variation in living species with known behaviors can provide

a baseline for interpreting morphology, and behavior, in the fossil record.

Tooth occlusal surface outlines in hominins and non-hominin primates, and other

mammals, have been used for assessments of taxonomic significance, with

variability often considered as being primarily phylogenetic. Few studies have

attempted to assess how diet might influence the pattern of variability in closely

related species. Here the …

Human Feeding Biomechanics : Intraspecific Variation And Evolution, Justin Ledogar

Legacy Theses & Dissertations (2009 - 2024)

This study examines feeding biomechanics in modern human crania and those of extinct early members of the human lineage in order to better understand the selective pressures that influenced human craniofacial evolution. Specifically, this study uses finite element analysis to examine: 1) human feeding performance, in terms bite force production and craniofacial strength; 2) intraspecific variation in human feeding biomechanics; 3) feeding biomechanics in fossil hominins, including Australopithecus sediba and Homo habilis, species that are potentially at the root of modern human lineage, and 4) the functional role of purported facial buttresses.

Arid Climate Decomposition And Decay: A Taphonomic Study Using Swine, James William Munkres

UNLV Theses, Dissertations, Professional Papers, and Capstones

The present project analyzes the taphonomic processes and variables involved in the decomposition and desiccation of animal remains in an arid/hyper-arid environment. The study and the derived data will assist in determining postmortem intervals for remains in modern contexts, inform judgments made regarding mortuary habits and techniques in archaeological contexts, and will improve our knowledge regarding taphonomic processes. Manner of deposition, the depositional surface/medium and arid-climate specific variables (temperature, water, insect activity, weathering, pH levels, and soil characteristics) were examined in this study. Reported observations are limited to the first ten months following death from early December through early October …