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 110 for “"Sex Ratios"”.
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Essays on Fertility and Sex Ratios in India
… have experienced a rapid increase in their sex ratios at birth. This dissertation examines the causes and consequences of these imbalances in the Indian context. Lower desired fertility can translate into more male-biased sex ratios if son preference remains strong, especially with greater …
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Evolutionary demography of structured two-sex populations and sex ratios
… trajectories. Models considering only a single sex cannot capture these effects, motivating the use of demographic two-sex models for sexually reproducing populations. I developed a new two-sex modeling framework that incorporates population structure and multiple life cycle processes through …
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Evolutionary demography of structured two-sex populations and sex ratios
… trajectories. Models considering only a single sex cannot capture these effects, motivating the use of demographic two-sex models for sexually reproducing populations. I developed a new two-sex modeling framework that incorporates population structure and multiple life cycle processes through …
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Traditional Agricultural Practices and Sex Ratios at Birth in Modern Times
… traditional agricultural practices on observed sex ratios at birth over last four decades. Building on the plough hypothesis developed by Ester Boserup and the work of Alesina et al. (2013), this study provides a further empirical test of the legacy of the plough. I perform empirical analysis on …
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Structural and Regional Bases of Sex Ratios in the Population of India
Made available in DSpace on 2014-12-14T04:57:24Z (GMT). No. of bitstreams: 1 7524390.pdf: 11809952 bytes, checksum: 84192ff950ea0de3fe261a62dde53430 (MD5) Previous issue date: 1975
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Molecular Genetic Assessment of Population Structure, Paternity, and Sex Ratios for the Reddish Egret
… paternity of nest mates, 7) determine offspring sex ratio. We collected blood samples of244 nestlings, each from a separate nest, from colonies in Texas, Baja California, Bahamas, and Florida. Genetic differentiation was dramatic (global Fst = .257) throughout the Reddish Egret's range extending …
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Crowded Out: The Effect of Sex Ratios on the Sex Worker Labor Market and Migration in India
<p>India’s skewed sex ratios have lead to the destruction of marriage markets in many villages as well as an increase in violence against women. This paper examines how India’s distorted sex ratios effects the migration of sex workers. By using a modified gravity model of migration the results in …
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A Study of Effects of Blood Types, Sires, Litter Size and Other Factors on Sex Ratios in Pigs
Sex distributions were studied in association with 11 pig blood group systems, (A, B, C, D, E, F,G, H, J, K and L) in matings segregating for blood types and analyzed by using segregation ratios as well as by the least-squares method. Effects of sire, litter size and selection for high whole-body …
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Sex Ratios and the City: Is parental corticosterone a mediator of the relationship between urbanization and offspring sex allocation?
… states that mothers can adjust their offspring sex ratios according to their own condition and the environmental conditions they face during breeding. Past tests of this hypothesis in avian species have focused on how natural variation shapes sex allocation trade-offs. However, urbanization also …
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An Evaluation of Deer and Pronghorn Surveys in South Dakota
… population perimeters, sample size, age and sex ratios of these three species. The primary objective of this study was to evaluate age and sex ratios and determine a minimum sample size for each study area for all deer species and pronghorn, in addition to deriving a methodology and …
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An assessment of a herpetofaunal community in Hamilton, County, Tennessee: baseline ecology, species richness, and relative abundance
… study investigating species richness, abundance, sex ratios, and body sizes of amphibians and reptiles in a Hamilton County, Tennessee, wetland. Utilizing drift fencing in conjunction with pitfall arrays, a total of 14 reptile species and 16 amphibian species was recorded. Evenness was low among …
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Biological Control of Red Imported Fire Ant (Solenopsis invicta) Using Pseudacteon (Diptera: Phoridae) in Central Arkansas
… cultellatus in parasitization trials. Host size, sex ratios, species ratios, and development times were recorded to evaluate possible competitive interactions between species. Due to a shortage of P. cultellatus at the Florida Department of Agriculture rearing lab, this species was not analyzed. …
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Assessment of the hatchery kokanee (Oncorhynchus nerka) release program in Lake Roosevelt 2009 -- 2012
… 2012) were analyzed to assess the percentage and sex ratios of each stock returning to spawn in Lake Roosevelt. We had record returns of hatchery kokanee in 2009 (n = 8,895) and 2010 (n = 8,925), but poor returns in 2011 (n = 423) and 2012 (n = 1,893). The F1 mixed stock significantly outperformed …
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Evaluation of the relationships between watershed-scale land use and contaminants in aquatic environments and the use of freshwater snails as indicators of impairment
… to watershed densities of AFOs. Population sex ratios of L. carinata varied across study sites, from balanced to female-biased, but were not related to concentrations of estrogenic compounds. However, the spatial variation in population sex ratios, coupled with little variation in …
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Seasonal and Ontogenetic Changes in the Sex Ratio of a Population of Stinkpots (Kinosternidae: Sternotherus odoratus)
… suggest turtle populations with biased sex ratios are the result of sampling errors such as improper sex determination, trapping bias, and behavioral differences between the sexes. This study was undertaken to determine if the observed sex ratio of a population of stinkpots (Sternotherus …
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Three Essays on The Economics of Sexually Transmitted Infections
Sexually transmitted infections (STIs) have important consequences for individuals and society. Extensive literature has shown that various individual factors impact STIs. However, much less is known about their structural causes and how they affect sexual behavior and sexual network formation. In …
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Density, Shell Use and Species Composition of Juvenile Fiddler Crabs (Uca Spp.) at Low and High Impact Salt Marshes on Georgia Barrier Islands
… lab, juvenile fiddler crab carapace width and sex were determined and multiplex PCR was used to identify juvenile fiddler crab species. Juvenile fiddler crab densities were lower at high impact sites, while shell availability and shell use were similar at both low and high impact sites. …
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Sexual selections in the northern fall field cricket, Gryllus pennsylvanicus: a manipulation of the adult sex ratio
The operational sex ratio has long been considered an important constraint on the structure of mating systems. The effects of an experimentally manipulated sex ratio on mating behavior and selection were investigated in a polygynous species, Gryllus pennsylvanicus, where the potential exists for …
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Three essays on development economics in China
… relative female and relative male income on sex imbalance. The second chapter studies the effects of relaxations in the One Child Policy on sex ratios and family size and then exploits the exogenous variation in family size caused by the relaxations to estimate the causal effect of family …
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