Why Predators Are Necessary (But Wear Your Bear Suit!)
A forest without predators may not last long. When predators vanish, herbivore (plant eating) animal populations explode, leading to the mass destruction of plant life and eventually to the destruction of the forest itself.
A research team led by John Terborgh of Duke University made a census of the herbivores and trees on several islands in Lago Guri, a lake in Venezuela that was created in 1986 when a river was dammed to produce hydroelectric power. When the water rose, the smallest of the islands lost nearly all of its predatory animals, such as jaguars, snakes and hawks. The situation was a unique natural experiment, testing two competing theories of how ecosystems are structured.
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