Genetic Bottleneck in Sierra Morena Iberian Lynx Reduced Diversity to Critical Levels

An entire predator population was compressed into a genetic echo chamber.

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🤯 Did You Know (click to read)

Captive-bred Iberian lynx have been successfully reintroduced into multiple regions across Spain and Portugal.

By the early 2000s, Iberian lynx were largely confined to two isolated populations: Doñana and Sierra Morena. Genetic analyses revealed dangerously low diversity, consistent with a severe bottleneck. Small effective population sizes increased the risk of inbreeding depression and reduced adaptive potential. With fewer than 100 individuals in the wild at one point, each breeding pair carried disproportionate genetic weight. Conservationists initiated managed breeding to prevent further loss of allelic variation. Individuals were translocated and paired strategically under scientific supervision. The goal was not simply increasing numbers but rebuilding functional genetic resilience. Without intervention, stochastic events could have wiped out entire lineages. The bottleneck was not theoretical; it was measurable at the DNA level.

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💥 Impact (click to read)

Low genetic diversity limits immune responsiveness and reproductive success, amplifying vulnerability to disease outbreaks. In a predator already dependent on a disease-prone prey base, this compounds systemic risk. Captive breeding centers became genetic banks designed to counteract evolutionary narrowing. European conservation policy shifted toward active genetic management rather than passive protection. The situation mirrored island extinction dynamics despite occurring on a continental mainland. It demonstrated how fragmentation can simulate insular isolation.

For the public, the idea that Europe’s most endangered feline required human matchmaking underscored how close extinction had come. Cubs born in captivity represented engineered second chances. The survival of future generations depended on spreadsheets tracking ancestry coefficients. The romance of wilderness was replaced by laboratory precision. Extinction risk had entered the era of molecular accounting. The predator’s fate was calculated in base pairs.

Source

National Geographic

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