Table 3 The linear mixed model testing for the effect of the species identity, environment (female fluid vs. PBS) and their interaction on sperm velocity (VCL).

From: Sperm morphology and performance in relation to postmating prezygotic isolation in two recently diverged passerine species

Model terms

Estimate ± SE

F

P

VCL

Intercept

60.68 ± 6.96

–

–

Species

− 4.52 ± 4.73

1.90

0.20

Environment

7.53 ± 4.21

5.62

0.02

Number of motile sperm

1.47 ± 1.57

0.87

0.35

Start time

− 0.06 ± 0.04

1.76

0.19

Species × environment

− 1.19 ± 5.80

0.04

0.84

  1. The number of motile sperm and starting time of the particular recording in sec were included in the model as covariates. The common nightingale species and female fluid environment were set as a reference. The estimates, standard errors (± SE), F-stats and P-values are shown, with significant P-values in bold.
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