## Table 1 |
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Effect of Mating Treatment on Components of Fitness |
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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