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Table 2 Results from linear models testing the relationship between sperm swimming speed (i.e. VCL) and a number of sperm morphological traits in (a) P. a. acuticauda and (b) P. a. hecki

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

Sperm trait Coefficient (±SE) t p
(a) P. a. acuticauda
 Head length −1.03 ± 0.8 −1.28 0.22
 Midpiece length 1.14 ± 0.27 4.20 0.0008
 Flagellum length 0.44 ± 0.55 0.80 0.44
 Total sperm length 0.44 ± 0.72 0.61 0.55
 Flagellum:head 0.44 ± 0.38 1.16 0.26
 Midpiece:flagellum 1.59 ± 0.52 3.04 0.008
(b) P. a. hecki
 Head length −1.27 ± 0.70 −1.80 0.09
 Midpiece length 1.03 ± 0.09 11.13 <0.0001
 Flagellum length 1.10 ± 0.16 6.79 <0.0001
 Total sperm length 1.44 ± 0.21 6.73 <0.0001
 Flagellum:head 0.82 ± 0.15 5.60 <0.0001
 Midpiece:flagellum 78.57 ± 39.56 1.99 0.06
  1. Sperm count data was also included in each model, but for simplicity and because the results of the covariate are not relevant to the relationships being tested, we present only the results of the correlation between sperm morphology and velocity
  2. Significant relationships shown in italics (p < 0.05)