Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 494 for “"body-size"”.
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Hormones and Body Size *Evolution in Old World Monkeys
This research shows that similar adult body size can be attained despite differences in levels of growth regulatory hormones during development. Results also demonstrate that absolute hormone levels during growth do not necessarily relate to adult size, contrary to the findings of previous research …
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The biomechanical consequences of body size differences in humans
Humans vary widely in body size and shape, but all humans are bipedal, and they are assumed to perform bipedalism in essentially the same way. Body size affects nearly all aspects of any animal’s ecology, physiology, and behavior, including locomotor behavior. Much of the theory underlying the …
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Relationships between body size, reproduction, and abundance in natural vegetation
… generally requires a relatively large plant body size. Yet, within natural, crowded vegetation, most resident species are small, and species size distributions are right-skewed at virtually all scales. I aim to provide a potential explanation for this paradox: small species are able to …
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Investigating and modelling the body size structure of benthic communities
… communities were investigated in terms of their body size distributions at three environmentally contrasting study sites: (i) a shallow-water location on the Fladen Ground, North Sea, (ii) a deep-water location in the Faroe-Shetland Channel and (iii) and a mid-slope oxygen minimum zone location …
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Using multivariate calibration to evaluate hominin brain/body size relationships
… is that brains and bodies have both increased in size during the course of human evolution but the rate, timing, and evolutionary relationship of the two are still unclear. This study uses methods that increase the sample size of fossil hominins, provide more confidence in body mass estimates, and …
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Body Size Regulation via BMP Signaling in <i>Caenorhabditis elegans</i>
<p>The body size of an organism can be a crucial determinant of access to nutrition, reproductive success and overall survival in the wild. However, how body size of an individual is determined is incompletely understood. Body size is a complex trait determined by multiple pathways and genes, …
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Body Size Histories in Cenozoic Reptiles From Global to Community Scales
Body size is a key ecological trait influencing trophic relationships, geographic distributions, and many other aspects of animal interactions with the environment. For poikilotherms, body size has a strong functional relationship to thermoregulation. This relationship means that body size …
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Intervertebral Articulation and the Evolution of Large Body Size in Archosauria
… to ever walk on the continents and some reached body sizes of up to 70 tons. Observation of their closest living relatives, birds and crocodylians, could never allow for prediction of gigantic dinosaurian forms. Therefore, the fossil record is crucial to understanding the evolutionary changes of …
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Trends in Eukaryote Body Size in an Ecological and Evolutionary Context
Body size is one of the most fundamental quantifiable traits of living or fossil organisms, and understanding it in various temporal and spatial contexts can offer key insights into the process of evolution. This volume examines body size of eukaryotes and its correlates in various temporal and …
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Patterns of habitat, microhabitat, and body size distribution in a lizard assemblage.
I investigated habitat use within an assemblage of four phrynosomatine lizards (Sceloporus graciosus, S. undulatus, Urosaurus ornatus, and Uta stansburiana) that are commonly syntopic in the pinyon-juniper woodland habitat on the elevated mesas of western Colorado. Lizard populations were censused …
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Incubation Temperature Affects Body Size, Energy Reserves, and Sex of Hatchling Alligators
… in a consistent, but complex pattern. Hatchling size was maximal at an intermediate temperature (32°C) and minimal at 29°C. Residual yolk mass was inversely related to yolk-free hatchling mass; higher yolk mass occurred at 31 and 33°C, and lower mass occurred at 29 and 32°C. Although the effects …
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Evolutionary and Ecological Patterns of Body Size in North American Freshwater Fishes
… and regional and local community patterns of body size in North American freshwater fishes, and to identify factors influencing these patterns. Cope's rule, Bergmann's rule, the energetic equivalence rule, and character displacement are examined using historical and field-collected data on …
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Cultural perceptions related to the health and body size of Antiguan women
… preferred health barrier solutions, and body size preferences and perceptions. Participants were 21-70 years old, and were divided into three age groups. Although 70% of the sample were either overweight or obese, weight issues received little priority as a health related factor. Instead, …
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Effects of body size on goose behavior: lesser snow goose and Ross's goose
Body size is highly variable among geese, both at intra- and interspecific levels. Interspecific variation in several behaviors has been attributed to differences in body size in geese: incubation constancy, tendency to maintain family units, and time spent foraging. Body size has important …
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Ecosystem Functional Consequences Of Body Size Variation In An Apex Predator (Ambystoma jeffersonianum)
<p>Biodiversity is often emphasized at the species level where each species is assigned a mean functional trait value. However, populations within a species, and individuals within a population, often exhibit considerable intraspecific functional variation. Therefore, instead of focusing on …
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The consequences and implications of ecology on body size distributions in social insects
… success and survival of an organism (e.g. size at birth, age at maturity, and size at maturity). One of the major tenets of life history theory is that finite resources must be allocated to the development of traits associated with growth, defense, and reproduction. Consequently, investment …
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The evolution of intraspecific variation, growth, and body size in early theropod dinosaurs
… early dinosaurs and their relatives, I hypothesize that this is the ancestral condition of dinosaurian growth, and that this was lost along the evolution to birds. These ontogenetic events are conserved through evolution, and I used this to assess the maturity of large Triassic theropods: I …
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Cultural Influences on Body Size Ideals Among African American Women in the Mississippi Delta
Results: One-on-one interviews yielded 25 cognitive maps. The maps contained a total of 169 concepts with 294 connections among them. The lowest number of variables identified on a participant’s map was 4 and the highest was 11. The lowest number of connections made on a participant’s map was 4 and …
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Wild bee responses to land use change: investigating the role of bee body size
… this remains poorly understood for many taxa. Body size is a trait that can vary widely across and within bee species, and has important ramifications for several aspects of bee fitness including foraging range. To better understand wild bee responses to land use change, I focused on bee body …
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