Effective population sizes and adaptive genetic variation in a captive bird population

Area of Science:

• Conservation Biology
• Population Genetics
• Animal Breeding

Background:

• Captive breeding programs are vital for ex situ conservation but often struggle with genetic diversity and inbreeding.
• Domestication selection can impact the genetic makeup of captive populations, potentially reducing their utility for reintroduction.

Purpose of the Study:

• To assess effective population sizes and genetic variation in a captive Red Junglefowl population.
• To investigate the impact of small population size and inbreeding on both neutral and adaptive genetic diversity.

Main Methods:

• Analysis of neutral microsatellite markers and single nucleotide polymorphism (SNP) variants at the MHC-B locus.
• Study included all 27 individuals from a single captive Red Junglefowl population with documented history.

Main Results:

• The captive Red Junglefowl population exhibited very low neutral and adaptive genetic variation.
• Low effective population sizes were observed, correlating with the population's demographic history.
• Divergent impacts of inbreeding and small effective size were noted on microsatellite versus MHC-B genetic variation.

Conclusions:

• Small captive populations face significant challenges in maintaining adaptive genetic variation.
• Understanding genetic dynamics is essential for effective management of captive populations for conservation purposes.