Behavioral development of captive male hybrid cercopithecine monkeys

Area of Science:

• Primate behavioral ecology
• Developmental biology
• Comparative psychology

Background:

• Vervet monkeys (Chlorocebus pygerythrus) and Sykes' monkeys (Cercopithecus albogularis) are distinct primate species.
• Understanding the behavioral development of hybrid species is crucial for evolutionary and genetic studies.

Purpose of the Study:

• To compare the behavioral development of male vervet monkeys, Sykes' monkeys, and their hybrids.
• To investigate potential sex-linked paternal effects on hybrid behavior.

Main Methods:

• Focal animal sampling was used to observe subjects from birth to 90 months of age.
• Behavioral categories included affiliative, approach, play, sexual, tension, and aggressive behaviors.
• Polynomial regression and the Wilcoxon signed ranks test were used for data analysis.

Main Results:

• Male hybrids generally followed the behavioral development pattern of Sykes' monkeys.
• Play behaviors in hybrids did not consistently align with either parent species' pattern.
• This suggests a potential sex-linked paternal influence on behavioral development.

Conclusions:

• Hybrid vervet x Sykes' monkeys exhibit a behavioral development pattern largely mirroring the Sykes' monkey.
• The observed pattern suggests a significant sex-linked paternal effect on the behavioral ontogeny of these hybrids.
• Further research is needed to fully elucidate the genetic and environmental factors shaping hybrid behavior.