NEW DELHI — Climate change and rising sea levels eventually may wipe out one of the world’s last and largest tiger strongholds, scientists warned in a new study.

The cats are among nearly 500,000 land species whose survival is now in question because of threats to their natural habitats, according to a report on Monday by the United Nations.

The Sundarbans, 4,000 square miles of marshy land in Bangladesh and India, hosts the world’s largest mangrove forest and a rich ecosystem supporting several hundred animal species, including the endangered Bengal tiger.

But 70 percent of the land is just a few feet above sea level, and grave changes are in store for the region, Australian and Bangladeshi researchers reported in the journal Science of The Total Environment. Changes wrought by a warming planet will be “enough to decimate” the few hundred or so Bengal tigers remaining there.