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. 2018 Sep;28(9):1309–1318. doi: 10.1101/gr.233809.117

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© 2018 Lu et al.; Published by Cold Spring Harbor Laboratory Press

This article is distributed exclusively by Cold Spring Harbor Laboratory Press for the first six months after the full-issue publication date (see http://genome.cshlp.org/site/misc/terms.xhtml). After six months, it is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.

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Figure 4. — Sperm length and sperm competition. (A) Sperm length of miRNA KO and control males. Sperm length is recorded for 9–11 individuals with 9–13 sperm measured per individual. Except for mir-977, all miRNA KO lines have significantly longer sperm compared to the control (Mann-Whitney U test). (B) Coefficient of variation (standard deviation/mean) of sperm length. All miRNA KO males tend to have sperm of more homogeneous length, especially mir-983 KO (Mann-Whitney U test, P < 0.001). (C,D) Sperm competition assay. Defense score represents the ability of the interested males in siring progeny when they mate with females that subsequently remated. Offense score is the reverse (see text). In all cases in which the control and KO males are significantly different (Mann-Whitney U test, P < 0.05), KO males have a higher fitness. (E,F) Linear regression of the median value from the sperm competition assay on the median sperm length. Angular transformation is applied to the defense and offense scores. Sperm length indeed has an impact of sperm competitiveness, and the trend is stronger for defense than for offense. (*) P < 0.05; (**) P < 0.01; (***) P < 0.001.