Gene diversity and female philopatry

Area of Science:

• Evolutionary biology
• Population genetics
• Behavioral ecology

Background:

• Female philopatry, a common behavior in social systems, influences genetic structuring within populations.
• Understanding gene diversity apportionment is crucial for comprehending population dynamics and evolutionary trajectories.

Purpose of the Study:

• To evaluate the impact of female philopatry on gene diversity distribution within social lineages.
• To compare genetic differentiation patterns in philopatric versus randomly dispersing populations.

Main Methods:

• Analysis of gene diversity apportionment under random mating and philopatric conditions.
• Calculation of fixation indices and coancestries to assess genetic structure.
• Modeling the influence of lineage size and male breeder number on genetic variance.

Main Results:

• Female philopatry leads to excess heterozygosity within social lineages, distinct from overall population heterozygosity.
• Genetic variance among lineages depends on lineage size and the number of males per lineage.
• Maximum genetic differentiation occurs with one male and philopatric females, common in mammalian systems.
• Fixation indices stabilize early, despite ongoing gene diversity loss via genetic drift.

Conclusions:

• Philopatry and polygyny are likely interconnected evolutionary strategies, not independent.
• The evolution of these behaviors favors increased gene correlations among adults over offspring.