Sexual selection, natural selection and copulatory patterns in male primates

Area of Science:

• Primate reproductive behavior
• Evolutionary biology
• Behavioral ecology

Background:

• Complex copulatory patterns, including multiple brief intromissions and prolonged single intromissions (PI), are observed in primate species.
• These patterns are most frequent in species with multimale and dispersed mating systems.
• The PI pattern is predominantly found in arboreal primates, specifically smaller nocturnal or larger diurnal species.

Purpose of the Study:

• To investigate the factors influencing the evolution of complex copulatory patterns in primates.
• To understand the ecological and selective pressures shaping mating behaviors.

Main Methods:

• Analysis of existing evidence on primate copulatory patterns.
• Comparative study across different primate species, considering mating systems, body size, and habitat.

Main Results:

• Prolonged single intromissions (PI) are strongly associated with multimale mating systems and arboreal lifestyles.
• Predation pressure appears to be a significant factor limiting the evolution of PI in small-bodied diurnal and terrestrial primates.
• Both sexual selection and natural selection likely played a role in the evolution of these copulatory patterns.

Conclusions:

• The evolution of primate copulatory patterns is shaped by a combination of mating system dynamics, ecological factors like predation, and selective pressures.
• Arboreal habitats and specific body sizes/activity patterns are key correlates of prolonged single intromissions (PI).
• Further research can explore the interplay of sexual selection and predation in shaping diverse reproductive strategies across primate taxa.