Hidden genetic diversity helped inbred brown tree snakes conquer guam

Researchers have discovered that brown tree snakes, which invaded Guam and devastated its native bird population, carried hidden genetic advantages that contributed to their success. Advanced DNA sequencing revealed over 19,000 large genetic differences in the snakes, with many concentrated in genes related to immunity and smell. This previously overlooked genetic diversity likely helped the snakes survive inbreeding and adapt to their new environment, allowing them to thrive and reach high densities. The findings suggest that the snakes' genetic variability played a key role in their ability to conquer Guam.

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