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 49 for “"mating systems"”.
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The Evolutionary Dynamics of Conflicts of Interest in Plant Mating Systems
… Earth is nearly matched by the diversity of mating systems and floral traits they exhibit. Since Darwin evolutionary biologists have been fascinated by this diversity and worked to explain and understand it. In this thesis I focus on aspects of the diversity in plant reproductive biology that …
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The evolution of mating systems in black scavenger flies (Diptera: Sepsidae)
… two of the most remarkable elements of their mating systems: the timing of copulations immediately after an oviposition bout (post-oviposition matings) and the males' escorting of ovipositing females. In a study of the patterns of sperm precedence in one sepsid species, I found that the …
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Evolutionary dynamics of mating systems in populations of North American Arabidopsis lyrata
Plants can vary in their mating systems from completely inbreeding to completely outcrossing, with intermediate forms referred to as mixed mating systems. Arabidopsis lyrata is a strongly outcrossing perennial due to a sporophytic self incompatibility (SI) system. The species occurs in temperate …
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Pollinator-syndrome driven changes in the mating systems of two Cape legume species
… of whether or not plants evolve different mating systems to accommodate their respective pollinators lies in finding a pair of closely related species differing only in pollination syndromes. Furthermore, it has been hypothesized that Non-Flying Mammal Pollination (NFMP) arises from a bird …
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The Evolution of Orthopteran Mating Systems and the Reproductive Ecology of New Zealand Cave Wētā
… that spectrum. The diversity of insects, their mating systems, and their reproductive adaptations has made them crucial to our understanding of sexual selection and the evolution of sexual reproduction itself. Their natural amenability to observation and experimentation has granted us many …
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Theory and Pattern of Life-History Evolution in Passerine Birds
… in annual adult survivorship, clutch size, mating systems, and nest structure were predicted from the combined effects of various mortality factors.
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The phylogenetics, taxonomy and biogeography of African arid zone terrestrial birds : the bustards (Otididae), sandgrouse (Pteroclidae), coursers (Glareolidae) and Stone Partridge (Ptilopachus)
… history attributes (including evolution of their mating systems).
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Male Reproductive Strategies And Mating Displays In The Ocellated Turkey (Meleagris Ocellata)
Animal mating systems are often characterized by intense competition for mates and resources. Despite how comthis conflict is, mating systems exist in which some adult males of breeding age seem to not participate. These apathetic males may be exhibiting alternative reproductive strategies, or …
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Characterization of the hermaphroditic reproductive system and sexual development in the planarian Schmidtea mediterranea
… to an end. Although there are numerous types of mating systems and sex determination mechanisms, as well as different modes of germ cell development, there is one clear goal – to produce new offspring with unique genetic makeup. Scientists have long been intrigued by this diversity, and …
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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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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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Intersexual Communication, Male Mate Preference, and Reproductive Energetics of the Polygynous Lizard, Anolis Carolinensis
… on reptile species and intrasexually selected mating systems. Because the life history traits and ecology of reptiles are dramatically different from other animal taxa, current models of sexual selection are insufficient for predicting how sexual selection should influence the behavior and …
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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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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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Vertical Resource Partitioning and Sexuality of Three Sympatric Species of Red Sea Sandfishes (Xyrichtys melanopus, Labridae; Trichonotus nikii, Trichonotidae; Gorgasia sp., Congridae)
… nikii, a gonochorist. Previous work on the mating systems and territoriality of all three sandfish species helped in part to explain the vertical spatial arrangement of the sandfish species within the community. Effects of pollution on the b iota of the Northern Gulf of Aqaba are noted.
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Attractive silences in cricket courtship song : mate choice using a short-range signal /
Matings systems using signals for sexual communication have been studied extensively and results commonly suggest that females use these signals for locating males, species-identification, and mate choice. Although numerous mating systems employ multiple signals, research has generally focused on …
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Evolutionary demography of structured two-sex populations and sex ratios
… survival, maturation, fertility, or mating availability. These demographic differences, in turn, affect population growth rates, equilibrium structure, and evolutionary trajectories. Models considering only a single sex cannot capture these effects, motivating the use of demographic …
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Evolutionary demography of structured two-sex populations and sex ratios
… survival, maturation, fertility, or mating availability. These demographic differences, in turn, affect population growth rates, equilibrium structure, and evolutionary trajectories. Models considering only a single sex cannot capture these effects, motivating the use of demographic …
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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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