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Table 1 Data on sperm morphology and performance for male Long-tailed Finches for each of the two subspecies, P. a. acuticauda and P. a. hecki

From: Subspecific variation in sperm morphology and performance in the Long-tailed Finch (Poephila acuticauda)

Trait P. a. acuticauda P. a. hecki t p
Mean ± SD Mean ± SD
Total length (μm) 75.50 ± 4.35 (n = 19) 72.02 ± 5.85 (n = 23) 2.15 0.038
Head length (μm) 12.80 ± 0.73 (n = 19) 12.77 ± 0.59 (n = 23) 0.19 0.85
Midpiece length (μm) 39.98 ± 4.41 (n = 19) 40.97 ± 5.30 (n = 23) −0.65 0.52
Flagellum length (μm) 62.70 ± 4.61 (n = 19) 59.25 ± 6.17 (n = 23) 2.01 0.051
Head width (μm) 6.61 ± 0.27 (n = 10) 7.03 ± 0.49 (n = 10) 2.43 0.026
Midpiece:flagellum 0.64 ± 0.07 (n = 19) 0.69 ± 0.06 (n = 23) 2.79 0.008
Flagellum:head 4.92 ± 0.51 (n = 19) 4.66 ± 0.62 (n = 23) 1.43 0.16
Acrosome:nucleus 0.75 ± 0.09 (n = 10) 0.77 ± 0.09 (n = 10) −0.45 0.66
Total sperm length CVwm 2.71 ± 0.89 (n = 19) 3.00 ± 1.45 (n = 23) 0.54 0.60
VCL (μm s−1) 91.33 ± 15.00 (n = 18) 86.70 ± 14.88 (n = 22) 0.99 0.33
Proportion of motile sperm 0.70 ± 0.15 (n = 18) 0.75 ± 0.16 (n = 22) 0.98 0.33
  1. Descriptive statistics are based on mean values calculated from ten sperm cells for each male, while significance testing used linear mixed-effects models with subspecies included as a fixed factor and male identity as a random factor
  2. VCL curvilinear velocity in μm s−1
  3. Significant values shown in italics (p < 0.05)