Thursday, January 9, 2014

Large carnivore decline puts humans at risk , study says

by John Roach, NBC News
A few years after wolves were reintroduced to the Northern Rockies in 1995, fifth-generation Montana rancher Rick Jarrett gave up on the
parcel of federal land near Yellowstone National Park that he grazed for 20 years. The carnivores harassed his cattle so much that they stopped gaining weight. Skinny cattle don't sell.

"It wasn't worth being there anymore," he told NBC News. To turn a profit, he now confines his livestock to several thousand acres on and around his ranch in Big Timber, where his cattle and sheep are free to pack on the pounds — for now. The wolves, he said, will eventually get there, too.

While Jarrett is bitter about having to live with wolves, such coexistence is increasingly necessary if the world hopes to reverse a downward spiral of its largest carnivores such as wolves as well as lions, tigers, and bears, according to a review study published Thursday in the journal Science.

As the carnivores decline, ecosystems and food chains that humans depend on for survival are unraveling and, in many cases, adding to the economic woes of everyone from farmers to ecotourism companies.