There are two forms of ovulation: spontaneous and induced. As copulation triggers ovulation for induced ovulators, males can predict the timing of ovulation and may have greater paternity monopolization than spontaneous ovulators. However, this prediction has never, to my knowledge, been tested. Using a cross-species comparison I examined the percentage of offspring sired within a litter (singl...

Female insects that mate multiply tend to have increased lifetime fitness, apparently because of greater access to male-derived resources (e.g. sperm, nuptial gifts) that elevate fertility/fecundity. Experiments that standardize the number of matings per female also show that polyandry can improve aspects of offspring performance, most notably early embryo survival (egg hatching success). This ...

Our understanding of selection through male fitness is limited by the resource demands and indirect nature of the best available genetic techniques. Applying complementary, independent approaches to this problem can help clarify evolution through male function. We applied three methods to estimate selection on flowering time through male fitness in experimental populations of the annual plant B...

Reflections on normative discourses on sexuality, family and reproduction are shown, promoted by medical and juridical knowledge in modern society. This study was based on the assumption that changes and maintenance of values and practices coexist in the current discourses on the desire to have children, expressed as claims in the dimension of sexual and reproductive rights, with new demands in...

In marriage, men obtain and women surrender parental rights because: (i) by default, an unmarried woman giving birth is the child’s only known parent and sole custodian; (ii) a married mother shares custody with her husband and the presumed father; (iii) custody allocation in marriage is fixed; (iv) private contracts on rights over children amount to trade in children and have limited legal val...

Males play a variable parental role in reproduction, ranging from no male parental care to extensive male care. Females may acquire either direct or indirect fitness benefits from their mate choice, and direct fitness benefits include male parental care. Theoreticians have traditionally emphasized direct fitness benefits to females in species with extensive male parental care. We review the lit...

In mixed paternity broods, extra-pair offspring often perform better than their maternal half-siblings. This has been interpreted as evidence for genetic benefits of female promiscuity, but a new study shows that the difference in fitness may be largely due to a non-genetic, maternal effect.

Recent studies have uncovered remarkable variation in paternity within primate groups. To date, however, we lack a general understanding of the factors that drive variation in paternity skew among primate groups and across species. Our study focused on hypotheses from reproductive skew theory involving limited control and the use of paternity "concessions" by investigating how paternity covarie...

We address various statistical aspects of biological parentage in multi-offspring broods that arise via multiple paternity or multiple maternity and, hence, consist of mixtures of full- and half-sibs. Conditioned on population genetic parameters, computer simulations described herein permit estimation of: (1) the mean number of offspring needed to detect all parental gametes in a brood and (2) ...

Why do females of many species mate with more than one male? One of the main hypotheses suggests that female promiscuity is an insurance mechanism against the potential detrimental effects of inbreeding. Accordingly, females should preferably mate with less related males in multiple or extrapair mating. Here we analyse paternity, relatedness among mating partners, and relatedness between parent...