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 75 for “"Mating system"”.
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Daily patterns of oviposition mediate sexual conflict in a polygynandrous mating system
… sexes are considered strong forces in shaping mating systems. Thus an understanding of the behaviour of both sexes is essential. The waterstrider Aquarius remigis has been used in several studies investigating sexual conflict. However, little is known about oviposition behaviour or how it …
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Weed versus wildflower : mating system ecology in a Taraxacum native-exotic contact zone
… in ploidy levels are often associated with mating system differentiation, especially in genera capable of clonal seed production through apomixis, which are derived from ancestral sexual lineages. The evolution of apomixis and associated changes in ploidy level contributes to niche …
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A molecular analysis of the population structure, mating system and demography of Eucalyptus
… dxr and two copies of dxs, with the aim of estimating the timing of major demographic events for the entire species and for the five regions from Chapter 1. To do this, I applied a novel analysis using Bayesian Skyline plots. The demographic reconstruction of the regions showed two trends of …
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A molecular analysis of the population structure, mating system and demography of Eucalyptus
… dxr and two copies of dxs, with the aim of estimating the timing of major demographic events for the entire species and for the five regions from Chapter 1. To do this, I applied a novel analysis using Bayesian Skyline plots. The demographic reconstruction of the regions showed two trends of …
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The Influence of Biogeography and Mating System on the Ecology of Desert Annual Plants
… I studied how related species with contrasting mating systems respond to variable environments to affect plant performance. In a three-year field study I investigated how inter-annual variation in plant reproductive phenology affects synchrony with pollinators and herbivores. Since selfing …
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The role of territoriality in the mating system of the springbok Antidorcas marsupialis (Zimmerman 1780)
… males mated with females, though multiple mating’s by one or more males were common. Ruts were initiated by males and could potentially occur at any time of the year. A number of factors were involved in triggering rutting, though not all ruts led to successful mating’s, possibly because …
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The biology of the Cape Weaver Ploceus Capensis with special reference to its polygnous mating system
… to what would be "required" by a polygynous mating system. Contrary to general theories, it is proposed that males do not suffer higher mortality than females during the breeding season. In fact it is suggested that females suffer higher mortality both in and out of the breeding season, …
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Evolution of floral and mating system variation in Camissoniopsis cheiranthifolia (Onagraceae): An evaluation of patterns and processes
… floral traits covary with one another and with mating patterns is an important step in understanding how and why mating systems evolve. I examined the evolution of floral and mating system variation in Camissoniopsis cheiranthifolia (Onagraceae), a species that exhibits divergence in key floral …
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Breeding biology, mating system and population dynamics of the Lesser Spotted Woodepcker (Picoides minor) : combining empirical and model investigations
… of the observed flexibility in the social mating system on the population persistence, a stochastic individual-based model simulating the population dynamics of the Lesser Spotted Woodpecker was developed, based on empirical results. However, pre-breeding survival rates could not be …
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SPECIES RECOGNITION IS DRIVING EVOLUTION OF THE ACOUSTIC MATING SYSTEM OF SHIELD BACK KATYDIDS (ORTHOPTERA: TETTIGONIIDAE: AGLAOTHORAX): BEHAVIORAL AND PHYLOGENETIC EVIDENCE
… are two processes that may drive evolution of mating systems and contribute to speciation. Evidence from nature is rare. I asked whether song evolution in shield-back katydids (Aglaothorax) from southern California is consistent with either of these processes. Analysis of male song recordings …
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Response to Selection for Pupal Weight With and Without Assortative Mating in Tribolium Castaneum
Joint effects of pre-selection mating system (random: R; assortative: A), selection mating system (R;A) and percent truncation selected (20%; 50%; 0% (control)) were studied in a 2 x 2 x 3 factorial experiment with 5 replicates to examine direct response to selection for pupal weight (PW), and …
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Models and analysis of yeast mating response : tools for model building, from documentation to time-dependent stimulation
Molecular signaling systems allow cells to sense and respond to environmental stimuli. Quantitative modeling can be a valuable tool for evaluating and extending our understanding of signaling systems. In particular, studies of the mating pheromone response system in yeast (Saccharomyces cerevisiae) …
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Inbreeding Depression and Competition in the square-stemmed monkey-flower (Mimulus ringens)
Matings between biologically related individuals often produce offspring with reduced fitness, a phenomenon known as inbreeding depression. The magnitude of inbreeding depression can play an important role in determining the overall fitness, and persistence, of populations, and is often considered …
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Accounting for intraspecific variation transforms our understanding of artiodactyl social evolution
A major goal in the study of mammalian social systems has been to explain evolutionary transitions in social traits. Recent comparative analyses have used phylogenetic reconstructions to determine the evolution of social traits but have omitted intraspecific variation in social organization (IVSO) …
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The evolution of self-compatibility and its genetic consequences in Leavenworthia alabamica (Brassicaceae)
… advantage or pollen limitation, and that this mating system may endanger the long-term viability of populations through mutation accumulation. The purpose of this dissertation was to evaluate the costs and benefits of self-fertilization in the species Leavenworthia alabamica, which exhibits …
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Incubation behavior and dispersal patterns in the Mountain Plover (Charadrius montanus)
<p>The rapid multi-clutch mating system of the Mountain Plover (Charadrius montanus) provides an interesting opportunity to examine sex differences in natal and breeding dispersal. I used nest locations from a breeding population of plovers in north-central Montana over a 13-year period (1995-2007) …
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Using molecular genetic techniques to detect outcrossing in natural populations of a self-fertilizing fish
… study to determine if males are involved in the mating system. The occurrence of cross-fertilization between males and hermaphrodites was determined by surveying progeny of field-caught hermaphrodites for non-segregation or segregation of DNA fingerprint markers as an indication of the …
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