Evolutionary Pathways to Communal and Cooperative Breeding in Carnivores.

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Animal Social Systems

Background:

• Cooperation in animal societies, particularly in rearing young, manifests as communal and cooperative breeding.
• Mammalian communal and cooperative breeding share delayed dispersal and alloparenting, but cooperative breeding uniquely includes reproductive suppression.
• The evolution of communal breeding is linked to direct fitness benefits, while cooperative breeding's evolution is hypothesized to stem from indirect fitness benefits due to reproductive suppression.

Purpose of the Study:

• To investigate the coevolution of delayed dispersal, reproductive suppression, and alloparenting in carnivores.
• To differentiate between the evolutionary pathways leading to communal and cooperative breeding.
• To understand the stabilization mechanisms of cooperative social systems.

Main Methods:

• Reconstruction of ancestral states for key social traits in carnivores.
• Analysis of transition rates among delayed dispersal, reproductive suppression, and alloparenting.
• Phylogenetic comparative methods to assess trait coevolution.

Main Results:

• Cooperative and communal breeding evolved via distinct evolutionary pathways.
• Delayed dispersal was identified as the initial step in the evolution of both breeding systems.
• The traits of delayed dispersal, reproductive suppression, and alloparenting coevolved, reinforcing each other's stability.

Conclusions:

• Cooperative social systems are stabilized by the coevolutionary interplay of key traits.
• The study highlights unique evolutionary patterns of sociality within carnivores.
• Separate evolutionary pathways underscore the distinct origins of communal and cooperative breeding.