An initial evaluation of the relationship between human pelvic size and shape and the distribution, type and severity of vertebral degenerative disease in archaeological material

Keyývords bipedal adaptation;pelvic shape; pelvic dimensions;vertebral degenerative disease. In order to adopt an efficient bipedal postureand method of locomotion, tile human skeleton has evolved a curved vertebral column and a stable, compact male pelvic girdle. Adaptive vertebral curves and the force of gravity render it susceptible to injury and degenerative change. This study examines if there is any association between pelvic size and shape and the distribution, type and severity of vertebral degenerative disease. Four documented North- west European, middle-class skeletal samples from the eighteenth and nineteenth century were examined. Pelvic shape and size were recorded, the latter of which necessitated the measurementof 93 dimensions. The severity and distribution of osteophytes, porosity and eburnation in the vertebral column were recorded. Statistical analysis was undertaken of relationships between pelvic measurements and tile sex and age at death of individuals as well as correlations between the measurements themselves. The relationship between pelvic shape and degenerative disease was also investigated. The correlation between measurements in the pelvis and disease were examined and a mechanism was created to display this relationship. Results demonstrated that this sample exhibited significant din-iorphic differcrices in pelvic measurements and pelvic shape between the sexes. Significant correlations were found between age and pelvic dirriensions in five (331/o)sacral, 29 (94%) innominate and four (25%) reconstructed pelvis measurements. Correlations were small but positive for both sexes in the sacrum and innorninate. In the reconstructed pelvis, significant correlations were again small, but Positive in females and negative in males, suggesting that although a larger pelvis may be selected for in older females, the opposite is occurring with males. This supports the theory of an evolutionary effect selecting for females with larger pelves and males with more compact pelves. Statistical analyses of tile relationship between pelvic shape and the severity or presence/absence of degenerative disease were limited and not deemed to have any statistical ment. A 'signpost' configuration was created to graphically display results of correlations between individual measurements and disease. Results suggest that osteophytosis was the most common type of disease encountered and the superior and inferior body surfaces were the main areas affected, particularly in the lower half of the thoracic and lumbar regions. All, correlations, except one, were positive, implying a positive association between those measurements and the degree of degenerative change. Patterning of the correlations was identified and discussed and statistical differences between correlations at levels of maximum and minimum curvature were examined. Results suggest that particular pelvimetry plays a significant role in this at levels of maximum and minimuni curvature. Discriminant function analysis was employed to explore the predictive ability of combinations of measurements to predispose to the development and severity of osteophytosis on the superior vertebral body surface. Contrived data was then used to test this model and was successful in predicting an expected level of expression of pathological change

An initial evaluation of the relationship between human pelvic size and shape and the distribution, type and severity of vertebral degenerative disease in archaeological material

In order to adopt an efficient bipedal posture and method of locomotion, the human skeleton has evolved a curved vertebral column and a stable, compact male pelvic girdle. Adaptive vertebral curves and the force of gravity render it susceptible to injury and degenerative change. This study examines if there is any association between pelvic size and shape and the distribution, type and severity of vertebral degenerative disease. Four documented North- west European, middle-class skeletal samples from the eighteenth and nineteenth century were examined. Pelvic shape and size were recorded, the latter of which necessitated the measurementof 93 dimensions. The severity and distribution of osteophytes, porosity and eburnation in the vertebral column were recorded. Statistical analysis was undertaken of relationships between pelvic measurements and tile sex and age at death of individuals as well as correlations between the measurements themselves. The relationship between pelvic shape and degenerative disease was also investigated. The correlation between measurements in the pelvis and disease were examined and a mechanism was created to display this relationship. Results demonstrated that this sample exhibited significant din-iorphic differcrices in pelvic measurements and pelvic shape between the sexes. Significant correlations were found between age and pelvic dirriensions in five (331/o)sacral, 29 (94%) innominate and four (25%) reconstructed pelvis measurements. Correlations were small but positive for both sexes in the sacrum and innorninate. In the reconstructed pelvis, significant correlations were again small, but Positive in females and negative in males, suggesting that although a larger pelvis may be selected for in older females, the opposite is occurring with males. This supports the theory of an evolutionary effect selecting for females with larger pelves and males with more compact pelves. Statistical analyses of tile relationship between pelvic shape and the severity or presence/absence of degenerative disease were limited and not deemed to have any statistical ment. A 'signpost' configuration was created to graphically display results of correlations between individual measurements and disease. Results suggest that osteophytosis was the most common type of disease encountered and the superior and inferior body surfaces were the main areas affected, particularly in the lower half of the thoracic and lumbar regions. All, correlations, except one, were positive, implying a positive association between those measurements and the degree of degenerative change. Patterning of the correlations was identified and discussed and statistical differences between correlations at levels of maximum and minimum curvature were examined. Results suggest that particular pelvimetry plays a significant role in this at levels of maximum and minimuni curvature. Discriminant function analysis was employed to explore the predictive ability of combinations of measurements to predispose to the development and severity of osteophytosis on the superior vertebral body surface. Contrived data was then used to test this model and was successful in predicting an expected level of expression of pathological change.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Psychological Sketches (8th Edition)

Permission to include in the University of Lethbridge Institutional Repository granted by Dr. John Vokey.Each of the chapters in this book is a short sketch of a particular topic in psychology. They can be read in any order as each chapter is meant to be a self-contained story. By the end of the book, we hope you will have learned what experimental psychology is about, what experimental psychologists do, and more specifically, what experimental psychologists do in the Department of Psychology and Neuroscience at the University of Lethbridge

A field study on Sumatran orang utans (Pongo pygmaeus abelii Lesson 1827) : ecology, behaviour and conservation

The results of a three year research project on the ecology, behaviour and conservation of the Sumatran orang utan are discussed. The 150 hectares Ketambe study area lie within the boundaries of the Gunung Leuser. reserve in Aceh Tenggara, and consists of mixed rainforest typical of hilly regions.The orang utan's food is irregularly distributed in quantity, space and time within this area. Although the orang utan is frugivorous he also eats leaves, insects, 'bark' and several other less important foods, such as bird's eggs. By far the largest part of the 114 food plants collected is typical primary rainforest growth. Figs make up an important part of the diet, particularly those known as the 'strangling' Ficus spp. As the fruiting seasons of the various strangling fig species are staggered over the whole year, and such trees are often enormous in size, they form particularly suitable food sources. Orang utans appear to have a good topographical knowledge of their 'home range'. There are indications that fig trees bearing ripe fruits are sometimes found by using the flight paths of flocks of hornbills, which also feed on figs. With respect to figs in particular, the orang utan must compete for its food with many other species, notably primates.The study area was regularly used by 22 individually recognized orang utans. Both males and females live in homeranges which overlap considerably and are 2-10 km sq. in extent. The population density of the Ketambe area is considerably higher than that reported for other areas in Indonesia, being approximately 5 individuals per square kilometre. Orang utans live a 'limited gregarious' lifestyle, that is, adult males spend the largest part of their time alone, and avoid encounters with other adult males. The adult females and their offspring stay together for the first 4-5 years of life (the birth interval is at least 3 years.). Adolescent social groups form after the mother-offspring bond becomes weaker. This social phase continues for each individual until either (a) the sexual dimorphistic characteristics of males are clearly distinguishable (at approximately 15 years of age), or (b) the female's first young is born (approximately 10 years of age). Adults also have social moments in their lives. Several individuals in an area can come together to form a 'temporary association' in certain fruit trees. It may be seen from their behaviour that they know each other well and that a network of relationships exist which is partly based on competitive dominance. A peaceful co-existence between adult males however, has not been observed; meetings between adult males had invariably an agonistic character. The sexual behaviour of the orang utan is roughly divisable into: (a) 'raping' of some females by sub-adult males; and (b) cooperative matings, where females often take the intitiative by presenting themselves to, usually, adult males. It appears that only the latter makes an essential contribution to reproduction.The social behaviour of the orang utan is considered and described in detail. Comparison of the behavioural repertoire of this species with that of the (gregarious) chimpanzee shows that the two species are closely related. There are clear differences in social organisation, however, which appear to be mainly of degree, rather than of quality. The social organisation of an animal must be a factor that fits its situational (i.e. environmental) context, but is based on phylogenetic characteristics. Comparison of the habitats of these two apes reveals that they both live in a similar ecological condition with respect to food. The reasons for the exceptional life-style on the part of the orang utan are possibly to be found in the predation pressure the species is exposed to, particularly by man. Man has been present in regions of South-EastAsia since the Pleistocene. It is plausible that the orang utan has been persecuted by man continuously from this time. A comparable influence on the chimpanzee is much more recent. The orang utan is the heaviest arboreal creature and has an exceptional social organisation for a primate. If it may be assumed that high intelligence is a biological outcome of complex group life then, on grounds of intelligence, and from the distinct social organisation and current arboreal life-style it maybe postulated that the orang utan has evolved from a groundliving social ape. This original form was supplanted from its niche by a better adapted ground-living social ape, that is, man. It is possible that a stricly arboreal life style for an animal as heavy as an adult orang utan is not compatible with a social life-style. Moreover, it is likely that refraining from a high degree of sociability and inconspicuousness are the best strategies against human predation.Since one possibility is that the hunting pressure in ancient (and current) times had a great influence on the biology of the orang utan, I have paid particular attention to hunting behaviour in hominids. At present, this form of threat is overshadowed by excessive habitat destruction. Cultivation in connection with the explosive population growth in Indonesia, together with the commercial timber concerns, affect the tropical rainforest ecosystem in such proportions that even reserves are threatened. Despite being protected since 1932, the orang utan is a severely endangered species. Rehabilitation of orang utans is a conservation action directed at reducing the still ongoing hunting pressure. This is despite the fact that there are clear risks in this to the wild population. These risks can be negated by confining rehabilitation projects to areas lacking a wild orang utan population.The orang utan is a component of an intact ecosystem and it is of utmost importance that the emphasis of nature conservation schemes is placed on the totality and balance of the tropical rainforest ecosystem. Every form of commercial exploitation within this ecosystem is incompatible with the proposed goal of preserving the system. The removal of components (e.g. 'selective logging' or 'selective hunting') does real damage to the balance of the system.An orang utan who lives in an exploited forest is in principle of equally small biological value as an orang utan in a zoo; it is a, debatably essential, biological solution that does not correspond to the set of conditions originally operating in its natural selection