Genetic rescue is an improvement in biological population fitness associated with introduction of genetic variation, often through gene flow into an inbred biological population. It differs from merely increasing numbers by adding individuals: the genetic contribution must improve descendant performance. The Florida panther restoration provided an empirical case in which introduced ancestry was followed by increased heterozygosity and improved survival measures. Outcomes depend on compatibility and ecological conditions, rather than making every introduction beneficial. [ref]
Genetic Restoration of the Florida Panther by Warren E. Johnson and others. Johnson and others, 2010, abstract and population-genetic restoration results
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