Coevolutionary feedbacks between family interactions and life history.

Area of Science:

• Evolutionary biology
• Behavioral ecology
• Life history theory

Background:

• Parental care involves a conflict between parents and offspring over resource allocation.
• Previous models focused on within-brood or between-brood competition to explain conflict resolution.
• Parent-offspring interactions can influence the evolution of life history traits like reproductive strategy.

Purpose of the Study:

• To investigate the coevolutionary feedback between life history traits (parity) and parent-offspring interactions.
• To model how parental investment strategies and family conflict are shaped by evolving life history traits.
• To understand the conditions favoring tight or weak coadaptation between parents and offspring.

Main Methods:

• A genetic simulation model was developed to allow parental parity to coevolve with investment traits.
• The model incorporated unlinked genetic loci for clutch size, parental sensitivity, baseline provisioning, and offspring begging.
• Simulations explored outcomes under different genetic variation conditions and assumptions about parental sensitivity.

Main Results:

• Tight parent-offspring coadaptation was observed in iteroparous (repeated reproduction) outcomes, while semelparous (single reproduction) outcomes showed weak coadaptation.
• Unrestricted genetic variation in clutch size led to the evolution of semelparity, maximal offspring begging, and poor coadaptation.
• Limiting genetic variation to iteroparity or treating parental sensitivity as fixed favored coadapted outcomes.

Conclusions:

• A feedback loop exists between reproductive strategy (parity), coadaptation, and parent-offspring conflict.
• Life history evolution significantly influences the degree of coadaptation and the resolution of family conflict.
• Understanding this feedback is crucial for explaining the evolution of parent-offspring interactions.