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 227 for “"Dimorphism"”.
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Queen size dimorphism in ants
… important exception. The case of ant queen size dimorphisms has not been studied in sufficient detail, and thus this thesis aimed at elucidating causes and consequences of the different size of small (microgynous) and large (macrogynous)ant queens using the North American ant species Leptothorax …
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Sexual Dimorphism in Permanent Human Dentition
Sexual dimorphism refers to differences between males and females of the same species. A general pattern of sexual dimorphism is displayed in humans. Across mammalian populations, males generally have a larger body than females. Many studies have shown that, as body mass increases, tooth volume …
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Investigating Sexual Dimorphism in Ceratopsid Horncores
Evidence for sexual dimorphism was investigated in the horncores of two ceratopsid dinosaurs, Triceratops and Centrosaurus apertus. A review of studies of sexual dimorphism in the vertebrate fossil record revealed methods that were selected for use in ceratopsids. Mountain goats, bison, and …
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Cranial Sexual Dimorphism in Hispanics Using Geometric Morphometrics
… in that human groups differ in size. Sexual dimorphism in the cranium has been explored in American Whites and Blacks (Kimmerle et al., 2008), but little is understood concerning sexual dimorphism in Hispanics; the fastest growing US population (Martinez and Ariosto, 2011). A better …
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Genetic constraints on the evolution of sexual size dimorphism
… concerning the evolution of sexual size dimorphism (SSD). Fecundity selection is often suggested as the main causal factor underlying the prevalence of female-biased SSD, but this assumption has not been empirically tested. I selected female Drosophila melanogaster for increased or …
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Tibial-fibular morphology: variation, sexual dimorphism, and mechanical implications
Stress fractures are common injuries among runners and military personnel associated with the mechanical fatigue of load-bearing bone. The tibia is the most frequently fractured site and females are at much greater risk than males. Bone geometry and density are hypothesized risk factors for stress …
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Cystatin C and sex dimorphism in experimental autoimmune encephalomyelitis
… role in female but not male EAE mice. This sex dimorphism in the function of CysC could also be observed in immune cell infiltration and demyelination in EAE. Towards elucidating the cellular mechanism(s) underlying the sex difference driven by CysC in EAE, I discovered that the protease …
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Correlated response and sexual dimorphism in bidirectional selection experiments
… and (2) the study of the inheritance of sexual dimorphism or body weight. The first experiment included data from four generations of double two-way selection for body weight and breast angle at eight weeks of age. Breast angle was considered a correlated trait in the weight subpopulation and …
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Sexual dimorphism in the genus Leucadendron : Morphology and plant hydraulics
… species that vary in their degree of sexual dimorphism. Males are generally more highly ramified (branched) with smaller leaves compared to corresponding females. It has been hypothesised that sexual dimorphism in Leucadendrons is linked to serotiny (a fire-adapted reproductive strategy), …
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Sexual Dimorphism and Consequences of Sex-Specific Selection in Drosophila melanogaster
… sex-biased geneexpression. Most of this sexual dimorphism is thought to arise because selection favours divergent phenotypes in the sexes. With Drosophila melanogaster as the study organism, my thesis takes several approaches to investigate sexual dimorphism and the implications of sex …
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Sex And Heterochromatin: An Investigation Of Sexual Dimorphism In Drosophila Melanogaster
<p>Over 30% of Drosophila genome is assembled into heterochromatin. Heterochromatin is relatively gene poor, transcriptionally less active and remains condensed during interphase. Previous studies established that roX RNA and some of the Male Specific Lethal (MSL) proteins, all components of the …
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Sexual dimorphism, resource partitioning and intraspecific aggression in Caprella californica Stimpson
… californica is dioecious and has marked sexual dimorphism in both its size and secondary sex characteristics. It is found from San Diego to the South China Sea (Laubitz, 1970), and is the dominant caprellid in the Zostera marina beds of the local bays and is a major diet item for many of the eel …
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The Genetic and Neural Basis of Sexual Dimorphism in Mosquito Behavior
… We found that these neurons show sexual dimorphism in their inputs, as female 11211-expressing neurons receive input from sensory neurons that detect the taste of blood. When we silenced the activity of these 11211-expressing neurons, females were able to feed on nectar and retain an …
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Sexual Dimorphism and Socioeconomic Status: Comparison between Migrant and Non-migrant Populations
Variation in sexual dimorphism is related to average body size differences and limb proportions between males and females between and within populations (Charisi et al. 2011). The Female Buffering Hypothesis suggests that expression of sexual dimorphism relies on male susceptibility to impairment …
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Investigating genetic and molecular factors contributing to sexual dimorphism in lung disease
… respiratory diseases that demonstrate sexual dimorphism. Male children experience increased asthma rates and worse health outcomes than female children, with this trend reversing after puberty. Importantly, sex differences exist for the hallmark features of asthma and COPD in inflammation, …
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Sexual Dimorphism and Behavioral Responses to Conspecific Chemical Cues in Pagurus samuelis
Anatomical differences were observed between sexes of P. samuelis. We measured the major cheliped and carapace lengths of hermit crabs caught off the coast of Southern California and found that male chelipeds were significantly larger relative to their carapace length than female chelipeds. Average …
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Sexual Dimorphism and Trophic Trait Evolution in the Carolina Bay Fundulus Complex
… lately the roles of sexual selection and sexual dimorphism have also been considered in the studies of speciation and adaptive radiation. In the present study I investigated a to date little studied system, the Carolina Bay Fundulus species complex, in which patterns of convergence and divergence …
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Effect of Thermal Stress on Anomalous Dimorphism of Aedes Communis (Diptera: Culicidae)
Made available in DSpace on 2014-12-09T20:27:14Z (GMT). No. of bitstreams: 1 6500784.pdf: 3890084 bytes, checksum: 87be1bdf4f69645291b7529dad9a76a7 (MD5) Previous issue date: 1964
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Effect of Thermal Stress on Dimorphism of Subarctic Aedine Mosquitoes (Diptera: Culicidae)
Made available in DSpace on 2014-12-05T21:34:06Z (GMT). No. of bitstreams: 1 6402855.pdf: 3326330 bytes, checksum: 12f054dedf290990159785066e783911 (MD5) Previous issue date: 1963
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