Abstract
Two-sex marriages in socially structured populations can be characterized as multiplicative perturbations of heterosexually random, or proportionate, mixing (Castillo-Chavez & Busenberg 1991). Such perturbations are expressed in terms of preferences, or affinities, of males for females, and vice versa. Male and female preferences are obviously not independent, since they depend on the availability of male and female behavioral classes. Knowledge of the preferences of one gender can characterize the preferences of both genders in socially structured populations; in other words, “it takes two to tango.” This is the basic content of the T3 Theorem. Different sets of preferences, that is, distinct behavioral classes, may give rise to identical mating probabilities, the determinants of the behavioral “ phenotypes” (Hsu Schmitz 1994; Hsu Schmitz et al. 1993). Hence, different sets of individual decisions can lead to identical social dynamics, a fact well established in genetics. The importance of the incorporation of mating systems at the population level is a neglected but central area in evolutionary biology.
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Castillo-Chavez, C., Schmitz, SF.H. (1997). The Evolution of Age-Structured Marriage Functions: It Takes Two to Tango. In: Tuljapurkar, S., Caswell, H. (eds) Structured-Population Models in Marine, Terrestrial, and Freshwater Systems. Population and Community Biology Series, vol 18. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5973-3_18
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