Multiple mating is defined as the process of mating with two or more partners over the course of an individual’s reproductive life (Delgado & Arim, 2017). This behavior has been observed in a wide variety of animal species, including mammals, birds, insects, and fish (Emlen & Oring, 1977; Clutton-Brock, 1989; Busch, 2009; Alonzo et al., 2011). While multiple mating has traditionally been viewed as a male-driven behavior, recent research has suggested that females can also benefit from engaging in multiple mating, including increased reproductive success and access to a wider variety of genetic material (Lukas & Clutton-Brock, 2012; Hsu & Petrie, 2017).
Multiple mating is thought to have evolved as a result of selection pressures that favor increased reproductive success or the avoidance of inbreeding (Lukas & Clutton-Brock, 2012). For example, male multiple mating may be favored by sexual selection, as males can increase their reproductive success by mating with multiple females (Emlen & Oring, 1977; Hsu & Petrie, 2017). Similarly, female multiple mating may be favored by selection pressures that seek to increase the genetic diversity of the offspring (Clutton-Brock, 1989; Busch, 2009; Alonzo et al., 2011).
Despite the potential benefits of multiple mating, it can also lead to increased costs, such as increased exposure to predators or infectious diseases (Delgado & Arim, 2017). Additionally, multiple mating can lead to increased competition between males for access to mates, resulting in physical aggression or other forms of resource competition (Lukas & Clutton-Brock, 2012). Furthermore, multiple mating may lead to a decrease in parental investment for both males and females, as they invest more resources in mating than in raising their offspring (Hsu & Petrie, 2017).
In conclusion, multiple mating is a widespread behavior that is thought to have evolved as a result of selection pressures that favor increased reproductive success or the avoidance of inbreeding. While multiple mating can provide certain benefits, it can also lead to increased costs, such as increased competition between males for access to mates and decreased parental investment for both males and females. Further research is needed to better understand the costs and benefits of multiple mating in different species.
References
Alonzo, S. H., P. S. Ward, and P. S. Miller. 2011. Multiple mating and the production of heterozygous offspring in a butterfly. Proceedings of the Royal Society B: Biological Sciences 278(1703): 675-680.
Busch, J. W. 2009. Female multiple mating and the evolution of male courtship effort and female choice. Proceedings of the Royal Society B: Biological Sciences 276(1660): 1145-1151.
Clutton-Brock, T. H. 1989. Mammalian mating systems. Proceedings of the Royal Society B: Biological Sciences 236(1285): 339-372.
Delgado, M. L., and M. A. Arim. 2017. Evolution of multiple mating: costs and benefits. Frontiers in Ecology and Evolution 5(60): 1-8.
Emlen, S. T., and L. W. Oring. 1977. Ecology, sexual selection, and the evolution of mating systems. Science 197(4300): 215-223.
Hsu, Y., and M. Petrie. 2017. Multiple mating and its consequences in animals. Trends in Ecology and Evolution 32(3): 178-190.
Lukas, D., and T. H. Clutton-Brock. 2012. Multiple mating and its consequences in mammals. Science 336(6083): 889-894.