Beginning in the 1960s, research has suggested that the human female pelvis is maladapted for childbirth due to the morphological changes resulting from the evolution of bipedalism. This maladaptation, known as the obstetric dilemma, was... more
Beginning in the 1960s, research has suggested that the human female pelvis is maladapted for childbirth due to the morphological changes resulting from the evolution of bipedalism. This maladaptation, known as the obstetric dilemma, was a concept first coined as a response to encephalized neonates being birthed through a small pelvic outlet. In the last decade, the obstetric dilemma has been called into question by anthropologists who argue that encephalization is not the sole reason for difficult childbirth. Current researchers suggest an interdisciplinary approach to the obstetric dilemma, suggesting that cultural, anatomical, and metabolic approaches may be interacting to contribute to the
difficult process of human birth. This paper argues that the obstetric dilemma should be viewed through the framework of evolutionary medicine, or an application of evolutionary theory to health and disease, thus taking a novel approach to the concept. While anatomical changes as a result of human evolution have undoubtedly complicated childbirth, the framework of evolutionary medicine offers the possibility to better understand these constraints in regards to health. Therefore, this calls for a reevaluation of the obstetric dilemma, given that constraints on the bony pelvis and the encephalization of neonates account for just some of the components causing risky, difficult childbirth.
difficult process of human birth. This paper argues that the obstetric dilemma should be viewed through the framework of evolutionary medicine, or an application of evolutionary theory to health and disease, thus taking a novel approach to the concept. While anatomical changes as a result of human evolution have undoubtedly complicated childbirth, the framework of evolutionary medicine offers the possibility to better understand these constraints in regards to health. Therefore, this calls for a reevaluation of the obstetric dilemma, given that constraints on the bony pelvis and the encephalization of neonates account for just some of the components causing risky, difficult childbirth.
- by Brittany Kenyon
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Research has shown immense behavioral variation across Macaca, likely due to the wide geographic range of the genus. Due to their marked sexual dimorphism, sex can be identified based on cranial and dental size. However, skeletal shape... more
Research has shown immense behavioral variation across Macaca, likely due to the wide geographic range of the genus. Due to their marked sexual dimorphism, sex can be identified based on cranial and dental size. However, skeletal shape variants distinguishing species are less clear. The current study sought to test a geometric morphometric protocol for sex and species identification in Macaca. 20 M. fascicularis and 20 M. mulatta (10 males and 10 females of each species) were collected from the UB Primate Skeletal Collection. Given that the crania and innominate most accurately portray sex and/or ancestry in humans, these bones were used for the present study. 29 cranial landmarks and 20 pelvic landmarks were captured using a MicroScribe GTM digitizer. Intra-observer error was calculated using the average standard deviation of three landmarking trials with calculated error rates <1mm for each configuration. Landmarks were subjected to a generalized Procrustes analysis and subsequently analyzed using principal components analysis (PCA), canonical variate analysis (CVA), and discriminate function analysis (DFA). Results suggest relatively large distinctions between males and females based on innominate shape, while cranial shape differences between the sexes were relatively minor following size adjustment. The shape of the innominate was distinct between the two species, particularly between females, while the cranium showed relatively less shape distinction between the two species. Therefore, these results indicate that sex and taxonomic identification based on skeletal shape are feasible, and that postcranial elements such as the pelvis may be more useful for taxonomic identification than previously thought.
- by Brittany Kenyon and +1
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This course introduces students to the field of primatology. It will investigate the evolutionary origins, taxonomic classification, and behavioral ecology of the four main groups of primates: prosimians, new world monkeys, old world... more
This course introduces students to the field of primatology. It will investigate the evolutionary origins, taxonomic classification, and behavioral ecology of the four main groups of primates: prosimians, new world monkeys, old world monkeys, and apes. The course will begin with a brief introduction to primate field students followed by a brief survey of extinct primate ancestors. The bulk of the course will explore the diversity of extant (living) primates. This will include lectures, labs, and videos explaining the taxonomic classification, anatomy, morphology, behavior, cognition, ecology, reproduction, and social structure of selected primate species. It will conclude with a review of major research areas in primatology and a discussion on primate conservation and the treatment of captive primates. LEARNING OUTCOMES By the end of this course, students will be able to: 1. Understand the taxonomic relationship between primate species and be able to accurately identify the differences between all primates. 2. Explain primate evolution by describing the major extinct primate ancestors. 3. Distinguish behavioral differences between primate species with a focus on sociality, ecology, and reproduction. 4. Compare anatomical differences between primate species with a focus on locomotion. 5. Define ethnoprimatology and understand the effect of ecology and human habits on wild primates.
- by Brittany Kenyon
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Research has shown extensive behavioral variation across Macaca, likely due to the wide geographic range of the genus. Due to their marked sexual dimorphism, sex can be identified based on cranial and dental size. Recent studies have... more
Research has shown extensive behavioral variation across Macaca, likely due to the wide geographic range of the genus. Due to their marked sexual dimorphism, sex can be identified based on cranial and dental size. Recent studies have demonstrated a wide cranial diversity throughout the order Primates, however, cranial shape variants distinguishing species are less clear. The current study sought to test a geometric morphometric protocol for sex and taxonomic identification in Macaca, testing the hypothesis that two closely related but geographically and behaviorally distinct species could be identified based on cranial shape. The study utilized 20 M. fascicularis and 20 M. mulatta (10 adult males and females of each species) that were collected from the UB Primate Skeletal Collection.
29 unilateral cranial landmarks were captured using a MicroScribe GTM digitizer. Intra-observer error was calculated using the average standard deviation of three landmarking trials with calculated error rates <1mm for each configuration. Landmarks were subjected to a generalized Procrustes analysis and subsequently analyzed using principal components analysis (PCA), canonical variate analysis (CVA), and discriminate function analysis (DFA). Results suggest relatively minor distinctions between males and females based on cranial shape following size adjustment, which is surprising given the degree of sexual dimorphism in Macaca. CVA and DFA results were able to partially determine species affinity, suggesting that a geometric morphometric approach to taxonomic classification is feasible. These results suggest that with a larger sample size and the utilization of bilateral landmarks, specific shape traits distinguishing macaque species could be determined.
29 unilateral cranial landmarks were captured using a MicroScribe GTM digitizer. Intra-observer error was calculated using the average standard deviation of three landmarking trials with calculated error rates <1mm for each configuration. Landmarks were subjected to a generalized Procrustes analysis and subsequently analyzed using principal components analysis (PCA), canonical variate analysis (CVA), and discriminate function analysis (DFA). Results suggest relatively minor distinctions between males and females based on cranial shape following size adjustment, which is surprising given the degree of sexual dimorphism in Macaca. CVA and DFA results were able to partially determine species affinity, suggesting that a geometric morphometric approach to taxonomic classification is feasible. These results suggest that with a larger sample size and the utilization of bilateral landmarks, specific shape traits distinguishing macaque species could be determined.
- by Brittany Kenyon and +1
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Identification of phylogenetically relevant skeletal traits is a pervasive problem in bioanthropology, particularly when it comes to the history of our own species. Traditionally, crania have been considered the gold-standard in terms of... more
Identification of phylogenetically relevant skeletal traits is a pervasive problem in bioanthropology, particularly when it comes to the history of our own species. Traditionally, crania have been considered the gold-standard in terms of phylogenetic relevance, but recent research has demonstrated the potential of postcranial elements, particularly the os coxa, for phylogenetic distinction at higher taxonomic levels (i.e. supra-generic). In the interest of challenging those limits, we test the hypothesis that two closely related, yet behaviorally distinct, species of macaque can be distinguished reliably based on pelvic morphology. A total of 20 landmarks were digitized on right os coxae of 20 adult Macaca fascicularis and 20 M. mulatta (10 male and 10 female of each species). Intra-observer error was calculated and returned an average standard deviation <1mm for three repeat trials on a single individual. Following generalized procrustes analysis, landmarks were analyzed using principal components analysis (PCA), canonical variate analysis (CVA), and discriminant function analysis (DFA).
Results of the PCA and CVA revealed interspecific shape differences in the angle of the superior and inferior pubic rami when comparing only females. Os coxa shape distinctions between males of each species were different to those seen in females and were much less clear using these methods. Results of the DFA (and accompanying cross-validation scores) corroborate those of the PCA and CVA with the addition of slightly more reliable interspecific distinction between males of the two species. Consequently, results provide partial support for the hypothesis with less reliable inter-specific distinction in males than females.
Results of the PCA and CVA revealed interspecific shape differences in the angle of the superior and inferior pubic rami when comparing only females. Os coxa shape distinctions between males of each species were different to those seen in females and were much less clear using these methods. Results of the DFA (and accompanying cross-validation scores) corroborate those of the PCA and CVA with the addition of slightly more reliable interspecific distinction between males of the two species. Consequently, results provide partial support for the hypothesis with less reliable inter-specific distinction in males than females.
Though sex can be identified based on sexually dimorphic characteristics in cercopithecinae, species distinctions based on skeletal shape variants are less clear. Additionally, the skeletons of captive primates are likely to exhibit... more
Though sex can be identified based on sexually dimorphic characteristics in cercopithecinae, species distinctions based on skeletal shape variants are less clear. Additionally, the skeletons of captive primates are likely to exhibit phenotypic plasticity due to their environment, making sex and species identification more difficult. Here we test the hypothesis that geometric morphometric methods and analyses could be useful for both sex and taxonomic assessment in captive cercopithecines, with the aim of using results to develop a reliable classification methodology based on morphology.
Landmark data were collected from the skeletons of 40 Macaca fascicularis, 40 M. mulatta, and 40 Chlorocebus pygerythrus (20 males and 20 females of each species) from the Buffalo Primate Skeletal Collection. Cranial (n=29) and pelvic landmarks (n = 20) were captured using a MicroScribe digitizer. Intra-observer error was calculated with a returned error rate of <1mm. Landmark configurations were registered using Generalized Procrustes Analysis and resultant shape variables were subject to a Principal Components Analyses and Canonical Variates Analysis. A Discriminant Function Analysis aided in predicting categorical memberships and misclassifications.
Results suggest relatively large distinctions between males and females based on pelvic and cranial shape and some morphological distinction among species, particularly between females. Results indicate that sex and taxonomic identification based on skeletal shape are feasible, and that postcranial elements may be more useful for identification than previously thought. The resulting data could be compared to specimens with similar morphology in order to quantitatively and reliably assess the taxonomic classification of previously unknown specimens.
Landmark data were collected from the skeletons of 40 Macaca fascicularis, 40 M. mulatta, and 40 Chlorocebus pygerythrus (20 males and 20 females of each species) from the Buffalo Primate Skeletal Collection. Cranial (n=29) and pelvic landmarks (n = 20) were captured using a MicroScribe digitizer. Intra-observer error was calculated with a returned error rate of <1mm. Landmark configurations were registered using Generalized Procrustes Analysis and resultant shape variables were subject to a Principal Components Analyses and Canonical Variates Analysis. A Discriminant Function Analysis aided in predicting categorical memberships and misclassifications.
Results suggest relatively large distinctions between males and females based on pelvic and cranial shape and some morphological distinction among species, particularly between females. Results indicate that sex and taxonomic identification based on skeletal shape are feasible, and that postcranial elements may be more useful for identification than previously thought. The resulting data could be compared to specimens with similar morphology in order to quantitatively and reliably assess the taxonomic classification of previously unknown specimens.
Most research in primate, including human, evolution use similarities and differences in cranial morphology to address questions relating to systematics and phylogeny. While primate cranial diversity tends to reflect primate taxonomy, the... more
Most research in primate, including human, evolution use similarities and differences in cranial morphology to address questions relating to systematics and phylogeny. While primate cranial diversity tends to reflect primate taxonomy, the phylogenetic efficacy of the primate post-cranium tends to be less clear, even though assessment of these bones is necessary given that many fossil remains include post-cranial elements.
Here, we test the hypothesis that post-cranial bones of the limb girdles reflect taxonomy using data collected from a representative male and female from 11 catarrhine species (n=22). The scapula and innominate were 3D scanned using an HDI structured light scanner. Scapula (n=17) and pelvic (n=20) landmarks were applied to the scans using Landmark Editor.
Following Procrustes superimposition, Procrustes distance matrices were subjected to a 2D multidimensional scaling (MDS) to visualize the affinities among individuals. For the scapula, cercopithecoids and hominoids tend to group separately, thereby reflecting gross taxonomic differences, although both Nasalis and Hylobates were exceptions to this, as both fell outside their expected groups. For the pelvis, individuals also separated based on gross taxonomy, but with clear differences between more arboreal and terrestrial cercopithecoids. Principal Components Analysis were performed to evaluate the morphological shape differences associated with each major taxonomic group. A Mantel test found that among individual scapula and os coxa, Procrustes distances were significantly correlated (r = 0.31, p = 0.006), but it remains to be tested to what extent these post-cranial patterns match the expectations based on genetic or cranial diversity patterns.
Here, we test the hypothesis that post-cranial bones of the limb girdles reflect taxonomy using data collected from a representative male and female from 11 catarrhine species (n=22). The scapula and innominate were 3D scanned using an HDI structured light scanner. Scapula (n=17) and pelvic (n=20) landmarks were applied to the scans using Landmark Editor.
Following Procrustes superimposition, Procrustes distance matrices were subjected to a 2D multidimensional scaling (MDS) to visualize the affinities among individuals. For the scapula, cercopithecoids and hominoids tend to group separately, thereby reflecting gross taxonomic differences, although both Nasalis and Hylobates were exceptions to this, as both fell outside their expected groups. For the pelvis, individuals also separated based on gross taxonomy, but with clear differences between more arboreal and terrestrial cercopithecoids. Principal Components Analysis were performed to evaluate the morphological shape differences associated with each major taxonomic group. A Mantel test found that among individual scapula and os coxa, Procrustes distances were significantly correlated (r = 0.31, p = 0.006), but it remains to be tested to what extent these post-cranial patterns match the expectations based on genetic or cranial diversity patterns.
The PILOST Field Project is a preliminary archaeological survey of southwestern parts of the island of Osterøy, Norway, as a joint project between the University of Bergen’s Department of Archaeology, History, Cultural Studies and... more
The PILOST Field Project is a preliminary archaeological survey of southwestern parts of the island of Osterøy, Norway, as a joint project between the University of Bergen’s Department of Archaeology, History, Cultural Studies and Religion, and the University at Buffalo’s Department of Anthropology. The focus of the project addresses the changes in patterns of enclosure of the landscape as well as settlement and burial patterns from the Neolithic through the historic periods in southwestern Norway.
The first field season of PILOST (summer 2016) initiated extensive field survey, with subsequent seasons in the planning stages for the summer of 2017 and beyond. GPS units were utilized to both track survey progress and create GIS maps of the surveyed areas. PILOST serves to further inform wider archaeological understandings and discussions regarding not only land use through time, but the interpretation of and attachment of fishing-farming communities to the archaeological landscape.
The 2016 field season data records more than 145 distinct landscape features, consisting primarily of walls, fences, and other boundary markers. These features were identified based on their potential utility to document and inform a wider archaeological discussion of the evolving nature of boundaries, in/outfield usage, and land ownership within farming communities.
The first field season of PILOST (summer 2016) initiated extensive field survey, with subsequent seasons in the planning stages for the summer of 2017 and beyond. GPS units were utilized to both track survey progress and create GIS maps of the surveyed areas. PILOST serves to further inform wider archaeological understandings and discussions regarding not only land use through time, but the interpretation of and attachment of fishing-farming communities to the archaeological landscape.
The 2016 field season data records more than 145 distinct landscape features, consisting primarily of walls, fences, and other boundary markers. These features were identified based on their potential utility to document and inform a wider archaeological discussion of the evolving nature of boundaries, in/outfield usage, and land ownership within farming communities.
Perceptions of disability and impairment in Medieval Iceland are often linked to specific character traits within historical literature. Recognition of what we would today consider a disabling condition varies greatly from source to... more
Perceptions of disability and impairment in Medieval Iceland are often linked to specific character traits within historical literature. Recognition of what we would today consider a disabling condition varies greatly from source to source making it difficult to determine the perceived nature of disability in medieval Icelandic society.
Haffjarðarey is a small island off the coast of Western Iceland on the southern coast of the Snæfellsnes Peninsula, north of Borgarnes. A regionally popular Catholic church and cemetery were built on the island some time before the year 1200 CE and remained in use until 1563 CE when the site was abandoned. Excavations throughout the early 20th century have revealed one of the largest cemeteries from this period.
This paper presents an interdisciplinary approach to the case study of a young adult female (18-24 years old) with skeletal features consistent with a clinical diagnosis of Facio-Auriculo-Vertebral Sequence (FAVs). FAVs is a highly variable spectrum of craniofacial and skeletal asymmetries with accompanying organ, central nervous system, and/or sensory defects. This paper considers paleopathological, literary, and archaeological evidence in a discussion of perceived and physical disability in the medieval North Atlantic.
Haffjarðarey is a small island off the coast of Western Iceland on the southern coast of the Snæfellsnes Peninsula, north of Borgarnes. A regionally popular Catholic church and cemetery were built on the island some time before the year 1200 CE and remained in use until 1563 CE when the site was abandoned. Excavations throughout the early 20th century have revealed one of the largest cemeteries from this period.
This paper presents an interdisciplinary approach to the case study of a young adult female (18-24 years old) with skeletal features consistent with a clinical diagnosis of Facio-Auriculo-Vertebral Sequence (FAVs). FAVs is a highly variable spectrum of craniofacial and skeletal asymmetries with accompanying organ, central nervous system, and/or sensory defects. This paper considers paleopathological, literary, and archaeological evidence in a discussion of perceived and physical disability in the medieval North Atlantic.
... presents an overview of the project background and the types of data that we will use to test ... Volcano, 100 kilometers to the southwest of Nerpich&amp;#x27;e Lake and 45 kilometers east of Ushki, is the ... In-creased soil... more
... presents an overview of the project background and the types of data that we will use to test ... Volcano, 100 kilometers to the southwest of Nerpich&amp;#x27;e Lake and 45 kilometers east of Ushki, is the ... In-creased soil fertility, proximity to raw materials such as obsidian (Tor-rence et al. ...
Understanding the life history correlates of ontogenetic differences in hominoid brain growth requires information from multiple species. At present, however, data on how brain size changes over the course of development are only... more
Understanding the life history correlates of ontogenetic differences in hominoid brain growth requires information from multiple species. At present, however, data on how brain size changes over the course of development are only available from chimpanzees and modern humans. In this study, we examined brain growth in wild Virunga mountain gorillas using data derived from necropsy reports (N = 34) and endocranial volume (EV) measurements (N = 86). The youngest individual in our sample was a 10-day-old neonatal male with a brain mass of 208 g, representing 42% of the adult male average. Our results demonstrate that Virunga mountain gorillas reach maximum adult-like brain mass by 3–4 years of age; adult-sized EV is reached by the time the first permanent molars emerge. This is in contrast to the pattern observed in chimpanzees, which despite their smaller absolute brain size, reportedly attain adult brain mass approximately 1 year later than Virunga mountain gorillas. Our findings demonstrate that brain growth is completed early in Virunga mountain gorillas compared to other great apes studied thus far, in a manner that appears to be linked with other life history characteristics of this population. Am. J. Primatol. 75:450-463, 2013. © 2012 Wiley Periodicals, Inc.
- by Amandine Eriksen
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