Tag Archives: poisoning

Mercury Pollution in Marine Animals May Be Behind a Population Crash

9 May

by Brian Owens, Cross Posted from Nature

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An isolated population of Arctic foxes that dines only on marine animals seems to be slowly succumbing to mercury poisoning.

The foxes on Mednyi Island — one of Russia’s Commander Islands in the Bering Sea — are a subspecies of Arctic fox (Vulpes lagopus) that may have remained isolated for thousands of years. They were once numerous enough to support a small yet thriving group of fur hunters. After humans abandoned the settlement in the 1970s, the fox population began to crash, falling from more than 1,000 animals to fewer than 100 individuals today.

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Will Lead Bullets Finally Kill Off the California Condor?

7 May

by Ted Williams, Cross Posted from Yale Environment 360

gallery_california_condor_profile

It was almost like watching wooly mammoths parting tusk-high savannah. In the gusty air above the Grand Canyon relicts from the Ice Age wheeled and dipped. Through my binoculars I could make out numbers on the wing tags of these California condors, North America’s largest and arguably most endangered bird.

By 1982 only 22 remained on the planet. Then in a decision that outraged a large element of the environmental community, the U.S. Fish and Wildlife Service announced that all condors would be evacuated from the wild and bred in captivity. Friends of the Earth founder David Brower pled for “death with dignity.” But in 1993 the Peregrine Fund, a conservation organization, took on captive breeding, and the program proved a stunning success. After only three years, condor releases started in northern Arizona.

Today 234 birds are living in the wild (194 of them captive bred), but the prognosis for the species is scarcely brighter than in 1982; they’re being poisoned. When lead bullets strike bone they tend to splinter, impregnating meat and entrails with toxic fragments, any one of which can kill a condor. All manner of carrion-eating birds and mammals feast on the poisoned gut piles left when hunters field dress game.

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