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Table 1 Characteristics (mean ± SE) of breeding females from mainland and island populations.

From: Island selection on mammalian life-histories: genetic differentiation in offspring size

  island (n = 51) mainland (n = 33) Fndf, ddf p-value
Body mass of offspring (g) 1.85 ± 0.01 1.74 ± 0.02 4.541,23.3 0.044
Litter size 5.0 ± 0.2 5.6 ± 0.3 3.091,82 0.083
Litter mass (g) 9.25 ± 0.37 9.74 ± 0.44 0.8131,80 0.370
Reproductive effort (1) 0.76 ± 0.03 0.81 ± 0.04 1.201,82 0.277
Reproductive effort (2) 0.40 ± 0.02 0.42 ± 0.2 1.201,29.1 0.392
Post-partum head width of mother (mm) 13.2 ± 0.1 13.3 ± 0.1 0.401,33.9 0.529
Post-partum body mass of mother (g) 23.2 ± 0.4 23.2 ± 0.4 0.021,32.1 0.896
  1. Only the test statistics of origin are presented from the mixed model analyses (SPSS 14.0). Origin of mother was used as a fixed factor and population as a random factor in the analyses. Mother was also used as a random factor in the analysis of offspring body mass. Reproductive effort (1) = L × M o 0.75/M m 0.75, and Reproductive effort (2) = L × M o /Mm; where L is litter size; M o is mean pup mass at birth, and M m is weight of the female after delivery. ndf = numerator degrees of freedom, ddf = denominator degrees of freedom.