Paternal care and litter size coevolution in mammals

Area of Science:

• Evolutionary biology
• Behavioral ecology
• Mammalogy

Background:

• Biparental care is common in socially monogamous mammals, but its evolutionary drivers remain unclear.
• Understanding the role of paternal care in mammalian life history is crucial for evolutionary studies.

Purpose of the Study:

• Investigate the evolutionary relationship between paternal care and offspring production in mammals.
• Determine if paternal care evolved due to offspring survival needs or if it drives increased offspring production.

Main Methods:

• Comparative analyses were used to examine associations between male care and life-history traits.
• The study tested hypotheses regarding the evolutionary causality between paternal care and offspring production.

Main Results:

• No evidence suggests paternal care evolved to support the rearing of costly offspring or large litters.
• Increases in offspring production appear to follow the evolution of paternal care, particularly when males provide resources.

Conclusions:

• Paternal care, especially resource provisioning, likely coevolves with litter size.
• Paternal care plays a significant role in maintaining monogamous systems and may facilitate the evolution of complex social behaviors in mammals.