The occurrence of selection during the haploid phase can have far-reaching consequences for fundamental evolutionary processes including the rate of adaptation, the extent of inbreeding depression, and the load of deleterious mutations, as well as for applied research into fertilization technology. This conclusion is further supported by the observation that selection for long-lived sperm resulted in increased offspring fitness in every trait that we examined, the opposite of what would be predicted if degradation arising from sperm aging had occurred. The altered behavior and lowered fertility were accompanied by alterations in the testis and brain transcriptome of possible significance for the behavior and fertility effects. The droplet was framed with a concentrated glucose solution to provide a dilution gradient attracting sperm toward the edges of the droplet Furthermore, we found a higher survival rate in offspring of LAT females treatment: In a first step we performed IVF experiments using the zebrafish D. A possible mechanism underlying the observed differences between LAT and SAT treatments is a trade-off between sperm swimming speed and sperm longevity
Our first aim was to describe any association between variation in sperm longevity and offspring fitness and to estimate its importance experiment 1 A and B.
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Genetic differences between selected sperm pools from three males. Dessa faktorer är av hög ekologisk relevans för fisk då förändringar på dessa kan ge negativa effekter på populationsnivå. Significance Diploid organisms produce haploid gametes for sexual reproduction, resulting in a biphasic life cycle. EE 2 är ett hormonstörande ämne med förmågan att ansamlas i organismer och mer än tio gånger så verksamt i fisk som det naturliga hormonet estradiol E 2. Two weeks exposure to 0. Windows are as described for Fig. Here we demonstrate that different cohorts of sperm phenotypes and genotypes, which exhibit varying levels of longevity and differentially affect offspring fitness, coexist within the ejaculate of a single male.