Table 1

Effect of Mating Treatment on Components of Fitness
Fitness Variable Mating treatment N Mean SEM
F0 F1 F2 F0 F1 F2 F0 F1 F2
Brood Size Single 40 121 335 3.02 2.83 0.28 0.20
Multiple 39 154 436 4.00 3.00 0.36 0.16
Breeding Success Single 73(.55) 121(.70) 32.7 82.2 0.55 0.46
Multiple 58(.69) 154(.75) 18.0 116 0.43 0.40
Growth Rate Single 121 144 0.12 0.12 .003 .002
Multiple 148 160 0.11 0.13 .002 .003
Size at Birth Single 121 144 0.85 0.86 0.06 0.07
Multiple 147 148 0.86 0.86 0.06 .004
Sexual Maturation Single 58 158 45.6 40 1.65 0.77
Multiple 91 187 47.8 42 1.43 0.76
Mortality Single 3 8 15
Multiple 2 10 14

Sample size (N), Mean and Standard Error of the Mean for single and multiple mating treatments at F0, F1 and F2, for each component of fitness. Mean brood size for F2 was calculated using only viable F1s (i.e., individuals surviving to 12 weeks). Breeding success in brackets is the fitted probability of producing a brood, based on a negative binomial distribution for F0 and a binomial probability distribution for F1. The means and standard error of means for breeding success were calculated using these two probability distributions. For all other variables arithmetic means are presented. Growth rate was calculated as the rate of weekly growth (cm) over 12 weeks. Maturation is the number of days from birth until sexual maturation. Mortality is the number of individuals that died per mating treatment before producing a first brood.

Barbosa et al.

Barbosa et al. BMC Evolutionary Biology 2012 12:185   doi:10.1186/1471-2148-12-185

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