In addition, we collected an unselected sperm sample and a finclip from each of the three males to use as a control and a reference for allele frequencies in the two selected pools. Gage MJGet al. Selection on sperm longevity results in an increase in offspring survival A and B and in increased sperm swimming VCL C and D and sperm density E in the resulting male offspring. First, decreasing fertilization success and resulting potential selection among eggs for sperm did not have any fitness effects on offspring in a similar setup Sperm sequencing, bioinformatics, and allele frequency comparisons. 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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Closeup of Sperm or Semen Moving Across the Screen
J Appl Ichthyol The finding of sex differences in fitness effects—that LAT males have a clear fitness advantage, producing more offspring than SAT males, but LAT females do not have this advantage over SAT females—is intriguing and may provide a possible explanation for the maintenance of variation in sperm phenotypes. To test for treatment differences in offspring reproductive success, we performed models including treatment and sex as fixed effect and tested for an interaction between the two. New York1st Ed. A possible mechanism underlying the observed differences between LAT and SAT treatments is a trade-off between sperm swimming speed and sperm longevity Lindeman LCet al.