Decline in big predators wreaking havoc on ecosystems, OSU researchers say

The decline of top predators such as North American wolves and African lions is driving increases in smaller predators such as coyotes and baboons, disrupting ecosystems and economies worldwide, a study concludes. The report, whose authors included two Oregon State University professors, found that the range of all the largest terrestrial predators in North America -- including wolves, cougars and bears -- has declined in the past 200 years. Meantime, the range of nearly two-thirds of smaller North American "mesopredators" has expanded, including territory for coyotes, several foxes, skunks and raccoons. The smaller predators are more populous and harder to control. They also adapt more readily to human development -- munching on garbage and pet food, for example. The study authors, who also included researchers from U.C. Berkeley and New Mexico State University, suggest that increasing wolf populations could actually benefit sheep growers by reducing coyotes. "Wolves will not tolerate coyotes," Ripple said. "They'll kill them."...read more