Fitness consequences of female multiple mating: A direct test of indirect benefits

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.

ISSN: 2730-7182