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 27 for “"Breeding system"”.
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Breeding System, Heterozygosity, and Seed Germination in a Population of Missouri Bladder-Pod, Lesquerella Filiformis Rollins
… seeds produced from one generation of natural breeding were used to estimate the breeding system and to examine the fitness consequences of heterozygosity. Both multilocus and single-locus estimates of the outcrossing rate (tm=1.000, ts=0.996) indicate a primarily outcrossing species. Among …
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The Prince or the Depauperate? Population Genetics of the Rare, Closed-flower Erica occulta
Understanding breeding systems and gene flow is important for the conservation of rare species. Despite this, they remain relatively unknown for Fynbos species. Erica occulta is a rare, dull, closed-flower Erica that is restricted to the few limestone cliffs near Groot Hagelkraal on the Southern …
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Population dynamics and reproductive ecology of the gynodioecious prairie species Lobelia spicata Lam. (Campanulaceae)
… prairie species found throughout Illinois. Its breeding system, gynodioecy, is relatively rare, and is characterized by having female and hermaphrodite plant morphs coexisting within populations. Although some data on the reproductive ecology of L. spicata has been gathered, the population and …
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The Evolution And Reproductive Ecology Of Oenothera (Onagraceae)
… approaches. Oenothera: Onagraceae) is a model system for studying plant reproductive biology. It provides excellent examples of shifts in reproductive traits such as pollination and breeding system, features that have been important in angiosperm diversification. These systems are …
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Comportamento como indicador de bem-estar de bezerros leiteiros mantidos em sistema tropical de criação
The breeding system exerts a great influence on the milk activity. It is important to characterize behavioral and feeding patterns of calves, which are related to health and well-being. The objective was to evaluate the behavior as an indicator of the well-being of dairy calves kept in a tropical …
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Ecological Conservatism and Traits Predict Introduction Risk and Co-Occurrence for the Flora of Chicago
… affinity were associated with C-score while breeding system and diaspore mass were not. In chapter 2, we examine what traits are associated with non-native introduction and post introduction invasion. We found that tolerance to both a wide range of climates and to anthropogenic disturbance …
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The reproductive biology of four geoflorous Protea species (Proteaceae)
Pollination systems of previously unstudied plant species are often inferred from floral traits that are shared among unrelated plant taxa. However, these ‘pollination syndromes’ are often not reliable predictors of the primary pollinator of a plant species, and may in fact represent adaptations to …
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The Effect of Selection on Egg Production in Single Comb White Leghorn Fowl
The practical value of any system of breeding for egg production must be demonstrated first to be appreciated by the average poultryman. High egg yield has been found by several workers to be due to the combined influences of early sexual maturity, non-winter pause, high intensity, non-broodiness …
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Characterization of a Diamond Proton Recoil Telescope for DT Neutron Measurements in the LIBRA Experiment
The LIBRA project investigates tritium breeding using beam-target style DT neutron generators to irradiate molten salt vessels. A critical aspect of understanding this process is the characterization of the energy and flux anisotropies within the neutron environment, which are inherent to the …
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Can and do Ericas self pollinate?
… self-incompatibility seems to be the predominant breeding system. It appears that, like E. urna-viridis, most of the other species analysed, via pollen tube analyses, have the potential to self-pollinate. However, more experiments are required to establish if these species are truly …
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The reproductive ecology of Minuartia patula Michx. Mattf. (Caryophyllaceae)
… the reproductive ecology, including the breeding system, phenology, and pollinators tell us about M. patula? 3) Are there differences in fruit set, seed set and germination rates among populations of Minuartia patula? Based on caging studies, flower phenology and pollen to ovule ratio, M. …
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Construction and analysis of the miscanthus genespace
… high heterozygosity due to its self-incompatible breeding system. This complexity necessitates the discovery of sequence variants that distinguish paralogs from alleles, which are most frequent in the low-copy non-coding fraction of the genespace. To enrich for such sequences from Miscanthus …
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Plant-pollinator relationships of culturally significant food and medicine plants in the Great Lakes Region
… plant species. Availability of information on breeding systems and important pollinators is crucial information for management of plant species, especially if a plant species is experiencing population declines (e.g. at-risk, endangered). A literature review was conducted to determine what is …
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Variation at Major Histocompatibility Complex Class I Loci In Two Killifish Species with Reduced Genetic Variance
… variation either as a consequence of their breeding system or population structure. The tempo and modes of molecular evolution acting on these loci has also been discussed. The marine killifish Rivulus marmoratus is the only vertebrate known to exist in nature in homozygous form. The …
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Public, Producer, Private Partnerships and EPR systems in Australian Wheat Breeding
Australia has a crop research system with higher research intensity than exists internationally. Motivated to improve R&D policy in Canada, this dissertation focuses on the Australian End Point Royalty (EPR) system for wheat and addresses four principal questions: (1) How was the Australian system …
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Know your place - Social network analysis in cooperatively breeding white-winged choughs (Corcorax melanorhamphos)
Cooperative breeding is a specialised type of social system in which individuals work together as a group to raise young. This breeding system entails variable costs and benefits for individuals based on their position in group social structure. Social network analysis has become an important tool …
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Know your place - Social network analysis in cooperatively breeding white-winged choughs (Corcorax melanorhamphos)
Cooperative breeding is a specialised type of social system in which individuals work together as a group to raise young. This breeding system entails variable costs and benefits for individuals based on their position in group social structure. Social network analysis has become an important tool …
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The birds, the bees and Erica: vulnerability of plant-pollinator communities in fragmented fynbos landscapes
… vegetative growth, and generalised pollination systems) could reduce dependence on specific pollinators and increase the chances of a species being able to persist through a period of low-pollinator abundance. The prevalence of autogamy and geitonogamy as alternatives to xenogamy was assessed in …
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The effect of habitat structure on reproduction and prey capture of a rare carnivorous plant, Pinguicula lutea
… gaps in knowledge of its basic biology (e.g., breeding system and prey identification) and to develop sampling protocols (e.g., seed set and prey sampling) for further work. Chapter 2 addresses the impacts of habitat structure (i.e., woody, grassy, and maintained) on reproduction and prey …
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From Hormones to Genomes: Investigating Testosterone, Social Behavior, and Evolution In Manakins
… birds notable for their unique polygynous breeding system. In Chapter I, I introduced the relationship between hormones, fitness, and behavior exploring the Cort-Fitness Hypothesis and the Challenge Hypothesis. Chapter II, I reviewed available studies on manakins, synthesizing findings on …
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