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Table 8 Sperm morphometrics of ssp. teydea and ssp. polatzeki of the Blue Chaffinch Fringilla teydea

From: Species-level divergences in multiple functional traits between the two endemic subspecies of Blue Chaffinches Fringilla teydea in Canary Islands

Sperm trait teydea (Tenerife) polatzeki (Gran Canaria) Test of difference between means Test of difference between variances Effect size Cohen’s d
Head length (μm) 17.05 ± 0.70 (22) 18.01 ± 0.60 (11) t 31  = −3.86, P < 0.001 F-ratio = 1.34, P = 0.65 −1.47
Midpiece length (μm) 224.10 ± 5.78 (22) 232.92 ± 4.41 (11) t 31  = −4.44, P < 0.001 F-ratio = 1.71, P = 0.38 −1.69
Tail length (μm) 13.63 ± 5.21 (22) 12.49 ± 4.41 (11) t 31  = 0.60, P = 0.55 F-ratio = 1.16, P = 0.84 0.23
Total sperm length (μm) 254.75 ± 3.74 (43) 263.42 ± 3.46 (11) t 52  = −6.96, P < 0.001 F-ratio = 1.17, P = 0.83 −2.40
CVwm total length (%) 1.24 ± 0.36 (43) 1.06 ± 0.26 (10) t 51  = 1.44, P = 0.16 F-ratio = 1.88, P = 0.31 0.60
CVbm of mean total length (%)a 1.48 1.34    
  1. aAdjusted for variation in sample size (N) by the formula CVbm = SD/mean × 100 × (1+ 1/4 N)
  2. Ten sperm cells were measured per male, except for one teydea and two polatzeki with very few sperm cells in the sampled ejaculate. Mean values are given with their ± SD (N)