Effect of Migration or Inbreeding Followed by Selection on Low-Founder-Number Populations: Implications for Captive...

Area of Science:

• * Entomology and population genetics.
• * Animal breeding and conservation strategies.

Background:

• * Sustainable captive breeding programs are crucial for managing insect populations, especially when founded with limited individuals.
• * Understanding the impact of genetic diversity and population structure is key to successful breeding protocols.

Purpose of the Study:

• * To evaluate the effectiveness of extreme captive breeding protocols in establishing sustainable populations from low founder numbers.
• * To compare the fitness of populations under different migration rates and inbreeding/selection regimes.

Main Methods:

• * Housefly (Musca domestica) populations were founded with two pairs of flies.
• * Treatments included varying migration rates (0%, 2.5%, 50%) and inbreeding followed by selection.
• * High-founder-number groups served as controls; population fitness (viability, productivity) was measured at generation five.

Main Results:

• * Populations with minimum (2.5%) or zero migration exhibited significantly lower fitness.
• * Populations with high migration (50%), inbreeding plus selection, or large founder numbers showed comparable, high fitness levels.
• * These findings indicate successful adaptation in specific breeding schemes.

Conclusions:

• * Captive breeding protocols incorporating substantial migration or inbreeding with selection can produce highly adapted populations from small founder groups.
• * These strategies are effective in overcoming challenges associated with low genetic diversity in newly founded populations.