Biol. Lett. 12, 20160220. (Published online 8 June 2016). (doi:10.1098/rsbl.2016.0220)
Owing to an error in one of the datasets, a small subset of the total sperm length data used in the original analyses of the paper ‘Intra-ejaculate sperm selection in female zebra finches’ was incorrect (the lengths of the sperm components had been incorrectly summed). The file has now been replaced with a corrected version on Dryad, and we have re-analysed the relevant data. None of the results or overall conclusions of the paper have changed, but the estimates and p-values obtained from the analyses are slightly different to those originally reported, as follows:
The difference between total sperm length in faecal and perivitelline layer samples:
original analysis: estimated effect = 0.209, t = 1.46, p = 0.145
corrected analysis: estimated effect = 0.234, t = 1.64, p = 0.100.
The difference between head length relative to total sperm length in faecal and perivitelline layer samples:
original analysis: estimated effect = −0.004, t = −8.82, p < 0.001
corrected analysis: estimated effect = −0.004, t = −8.92, p < 0.001.
The difference between midpiece length relative to total sperm length in faecal and perivitelline layer samples:
original analysis: estimated effect = −0.003, t = −1.05, p = 0.293
corrected analysis: estimated effect = −0.003, t = −1.14, p = 0.255.
The difference between the coefficients of variation of total sperm length in faecal and perivitelline layer samples:
original analysis: t = 4.55, d.f. = 26, p < 0.001
corrected analysis: t = 4.78, d.f. = 26, p < 0.001.
The difference between the coefficients of variation of head length relative to total sperm length in faecal and perivitelline layer samples:
original analysis: t = 9.78, d.f. = 26, p < 0.001
corrected analysis: t = 9.84, d.f. = 26, p < 0.001.
The difference between the coefficients of variation of midpiece length relative to total sperm length in faecal and perivitelline layer samples:
original analysis: t = 14.01, d.f. = 26, p < 0.001
corrected analysis: t = 13.74, d.f. = 26, p < 0.001.