Detecting hybridization between wild species and their domesticated relatives

Area of Science:

• Conservation genetics
• Population genetics
• Wildlife biology

Background:

• Free-ranging domestic/feral animals and game releases pose a threat to wild populations through introgressive hybridization.
• Hybridization can disrupt local adaptations, leading to population decline and biodiversity loss.
• Detecting sporadic introgression is challenging without direct parental population sampling.

Purpose of the Study:

• To identify the occurrence and extent of introgressive hybridization in European wild populations.
• To assess the impact of hybridization on genetic integrity and local adaptations.
• To provide data for evaluating risks of outbreeding depression and informing conservation strategies.

Main Methods:

• Utilized hypervariable DNA markers (microsatellites) for population structure assessment.
• Employed advanced statistical methods, including Bayesian models, for admixture analyses.
• Conducted individual assignment testing to identify introgressed individuals and hybridizing populations.

Main Results:

• Introgressive hybridization was found to be locally pervasive in studied European populations.
• Genetic methods successfully identified introgressed individuals and hybridizing populations.
• The study quantified the extent of hybridization in wolves, wildcats, and partridges.

Conclusions:

• Conservation plans are crucial to preserve the gene pools of wild populations facing hybridization threats.
• Population genetic methods are effective tools for monitoring and managing hybridization risks.
• Careful control of invasive feral animals and game restocking is essential to prevent genetic diversity loss.