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 6 of 6 for “"sperm precedence"”.
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The evolution of prezygotic reproductive isolation in the Drosophila pseudoobscura subgroup
… between gametes, in particular conspecific sperm precedence. Until this study, patterns of sperm precedence had rarely been examined between divergent populations or subspecies within a species. I will evaluate conspecific sperm precedence and its role in reproductive isolation between two …
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Mechanisms and consequences of hybridisation between Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)
… investigate mechanisms of hybridisation through sperm-egg interactions, much of which is poorly understood. Salmon and trout experience conspecific sperm precedence during in vitro sperm competition experiments, when sperm volumes and release times are equalised. This thesis firstly aimed to …
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Mating dynamics of South African forest millipedes : Centrobolus (Diplopoda: Pachybolidae)
… two most common mechanisms of sexual selection, sperm competition and cryptic female choice. The approach was to (1) quantify sexual dimorphism and find the selection pressures operating on the sexes, (2) determine the functional significance of male and female genitalia, (3) understand why there …
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The evolution of mating systems in black scavenger flies (Diptera: Sepsidae)
… females. In a study of the patterns of sperm precedence in one sepsid species, I found that the sepsids' peculiar timing of matings is not associated with unusual patterns of sperm precedence: sepsid males displace rival sperm and achieve a large last male advantage, which is the most …
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Extra-pair paternity within the female-defense polygyny of the lizard, Anolis carolinensis: Evidence of alternative mating strategies
… from resident females who, in turn, both store sperm and ovulate a single-egg clutch at weekly intervals over a 4-month breeding season. Paternity of hatchlings in 16 naturally occurring breeding groups was analyzed to determine the extent to which the territorial resident male was able to …
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The movement behavior and reproductive ecology of western corn rootworm beetles (coleoptera: chrysomeliae) in Bt cornfields with structured and seed blend refuges
… the five day experiment. Chapter 5 describes a sperm precedence study, in which females were given the opportunity to mate with a new male each day and paternity was assessed for family groups of egg batches as well as the female beetle and her two mates using microsatellite genotyping. Of the …