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Gharial Genetic Diversity Crisis: Numbers Up, Resilience Down
9 Sep
Summary
- Gharial population rose tenfold but genetic diversity is critically low.
- Low diversity makes gharials vulnerable to disease and climate change.
- Past population collapses contributed to current genetic deficiencies.
Critically endangered gharials have experienced a remarkable tenfold population increase, now numbering around 3,000 individuals. However, a groundbreaking study by the Wildlife Institute of India reveals a concerning reality: their genetic diversity is significantly lower than other crocodilian species. This low genetic variation, stemming from historical population collapses, leaves the species perilously exposed to disease and environmental shifts.
The first genomic study of gharials, published in BMC Genomic Data, analyzed populations along the Chambal river. Researchers identified signs of inbreeding, likely linked to severe population drops in the species' past. Prehistoric declines and a more recent human-driven collapse, caused by hunting and habitat destruction, reduced their numbers drastically over centuries.
Conservationists now warn that focusing solely on population counts is misleading. The current genetic vulnerability means that without robust efforts to protect river corridors and integrate genetic management, the gharial's future remains precarious. The study underscores that true recovery requires addressing genetic resilience alongside population size.
