Skip to main content

Table 2 Descriptive statistics (median, first and third quartile) of body traits, breeding coloration variables and testis and sperm traits of young and old males used in the analyses

From: Male reproductive traits of full-sibs of different age classes in three-spined sticklebacks (Gasterosteus aculeatus)

  Young Old
  Median 1. Quartile 3. Quartile Median 1. Quartile 3. Quartile
Body size [cm] 4.90 4.70 5.10 5.20 4.95 5.40
Body mass [g] 1.562 1.372 1.712 1.812 1.617 2.031
Body condition 1.30 1.25 1.36 1.29 1.24 1.35
Red area [%] 14.84 6.22 27.21 13.74 6.29 21.94
Carotenoid chroma (A) 0.450 0.287 0.538 0.392 0.189 0.501
UV chroma (A) 0.271 0.244 0.291 0.245 0.209 0.273
Red/orange hue (A) [nm] 506.0 502.0 509.5 505.0 501.0 508.5
Total brightness (A) 2701.70 2072.17 3719.65 3267.38 2489.20 4939.09
Total brightness (R) 3075.86 2374.82 4326.12 1963.18 1402.66 3114.35
Absolute testis mass [g] 0.0107 0.0084 0.0140 0.0165 0.0135 0.0202
Relative testis mass (GSI) 0.697 0.585 0.862 0.951 0.731 1.103
Testis melanisation (L*total) 39.00 26.88 47.13 60.50 49.38 67.50
Sperm number 9.3*106 6.0*106 12.2*106 10.7*106 7.9*106 14.4*106
Head length [μm] 1.106 1.067 1.128 0.991 0.958 1.011
Tail length [μm] 18.033 16.946 19.280 17.017 16.036 17.600
Head width [μm] 1.076 1.048 1.104 0.999 0.979 1.018
Mid-piece width [μm] 0.782 0.761 0.813 0.766 0.731 0.792
Mid-piece volume [μm3] 0.284 0.268 0.311 0.256 0.239 0.281
Mid-piece length [μm] 0.587 0.548 0.614 0.583 0.515 0.621
Head to tail length ratio 0.094 0.089 0.099 0.091 0.087 0.098
  1. (A) colour measurements were made directly below the eye (breeding coloration).
  2. (R) measurements were taken at the dorsum below the first dorsal spine.
  3. (GSI) gonadosomatic index after de Vlaming et al. (1982).
  4. (L*total) testis brightness (see Mehlis et al. 2012 for details).