Search for dissertations about: "sperm competition"
Showing result 1 - 5 of 15 swedish dissertations containing the words sperm competition.
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1. Selection in sperm and its consequences : Exploring haploid selection, ageing and epigenetic effects in sperm
Abstract : Sexually reproducing eukaryotes are typically going through a biphasic life cycle with a diploid and a haploid phase. Unlike in plants where selection on haploid pollen genotypes is well established, the possibility of selection occurring in animal sperm is currently not known. READ MORE
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2. Choice, competition, and interactions between episodes of sexual selection
Abstract : Choice and competition are essential parts of evolutionary biology. In an effort to pass their genes from one generation to the next, animals may carefully choose their mating partners, and/or compete for access to mates. READ MORE
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3. Gonad and ejaculate allocation in alternative reproductive tactics of salmon and trout with reference to sperm competition
Abstract : Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., exhibit alternative male maturation phenotypes, anadromous and precociously mature parr, which commonly endure in sperm competition at the spawning grounds. READ MORE
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4. Sexual selection in Pomatoschistus – nests, sperm competition, and paternal care
Abstract : Sexual selection arises through variation in reproductive success. This thesis investigates different aspects important in sexual selection, namely nest building, sperm competition, paternity and paternal care, and their mutual interrelationships. READ MORE
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5. Life history evolution in a bivoltine butterfly
Abstract : Evolution is not always straight-forward, as selection pressures may differ between different generations of the same species. This thesis focuses on the evolution of life history of the model species, the Green-veined White butterfly Pieris napi. In central Sweden P. napi has two generations per year. READ MORE