Table 3

Summary of the leading four eigenvectors from a Principal Components (PC) Analysis of male reproduction traits

factor


PC axis

eigenvalue (%)

courtship ability a

mating ability b

number of transferred sperm c

spermatid size d

sperm production rate e

P2 early

P2 late


PC1

3.04 (43.4%)

0.373

-0.292

0.076

0.395

-0.531

0.566

0.110

PC2

2.41 (34.5%)

-0.454

-0.513

0.553

0.075

0.171

-0.016

0.437

PC3

0.753 (10.8%)

0.129

0.060

-0.540

0.036

0.216

0.040

0.799

PC4

0.654 (9.3%)

-0.307

0.230

-0.115

0.884

0.189

-0.078

-0.132


a mean percent of observations with male-female contact and/or spicule insertion; b mean percent females inseminated in 9 h; c median number of sperm; d median diameter (μm); e mean number of sperm/min.

Murray et al. BMC Evolutionary Biology 2011 11:99   doi:10.1186/1471-2148-11-99

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