What Animals Migrate From Mexico To The United States
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US-Mexico Edge Fence May Impairment Animal Migration
A program to argue off a third of the U.South. border to stop illegal immigration from United mexican states may harm migration routes used by animals including rare birds and jaguars, environmentalists and U.S. authorities warn. 
The planned barrier would also sever the rugged highland trails used by "pioneer" jaguars currently crossing from United mexican states and repopulating the rugged Peloncillo mountains east of Douglas after decades of absenteeism. (Juan Carlos Ulate/Reuters)
The House of Representatives passed a bill this month authorizing the structure of about 700 miles (1,120km) of double fencing along the 2,000-mile (three,200-km) border, which was crossed by more than one million illegal immigrants last twelvemonth.
The proposal, which the Senate is expected to vote on in coming days, seeks to build continuous barriers separated by an access road for patrol vehicles on long stretches of the border in California, Arizona, New Mexico and Texas.
Environmentalists and U.S. Fish and Wild fauna Service wardens say the bulwark would disrupt the migration of scores of species from jaguars to hawks and humming birds along a wild fauna corridor linking northern United mexican states and the U.S. southwest known as the "Heaven Islands."
The chain of forty mountain ranges links the northern range of tropical species such as the jaguar and the parrot in the Mexican Sierra Madre Mountains, and the southern limit of temperate animals such as the black bear and the Mexican wolf in the U.S. Rocky Mountains.
"Bisecting the expanse with an impermeable barrier such as a double reinforced wall or fence could actually accept a devastating effect on these species," said Matt Skroch, a wildlife biologist and executive director of the environmental non-turn a profit group Sky Isle Alliance in Tucson, Arizona.
"If they build information technology, we could really say goodbye to the future of jaguars in the United States," he added.
PIONEERS CROSSING Northward
The proposal under consideration by Congress would replace a patchy, chest-high spinous wire fence that cuts across the wilderness areas of the southwest with large sweeps of continuous double barrier fencing topped with brilliant lights.
U.S. Fish and Wildlife Service wardens in Arizona say the planned bulwark would touch the fragile desert ecosystem, and could also damage migratory birds such as Grey and Swainson hawks and Rufous hummingbirds that soar over it.
"The contend would take a negative result on everything from the insects that would now be flight around the lights instead of pollinating the cactuses, to the birds that eat them, correct up to the large predators like the jaguars," said William Radke, the manager of the San Bernardino National Wildlife Refuge, e of Douglas, Arizona.
Radke said the fence would prevent snakes and turtles, too as wild turkeys and road runners from crossing. In addition, the bright lights at the pinnacle of the alpine argue would interfere with birds' ability to navigate by the stars.
"A lot of migratory birds actually migrate at night, using stellar navigation and the moon to navigate. Suddenly lighting them upwards may disrupt a bird'due south power to feed and rest and it may impact its survivability later on," he added.
Radke said the planned barrier would also sever the rugged highland trails used by "pioneer" jaguars currently crossing from Mexico and repopulating the rugged Peloncillo mountains east of Douglas after decades of absenteeism.
The spotted cats originally roamed the Americas from Argentine republic in the southward, to the Grand Canyon, in northern Arizona, but vanished from the Us several decades ago due to hunting and pressure level from homo inroad on their habitat.
"The jaguars and a lot of the other wildlife that pioneer north from Mexico are coming here considering their habitats are filling upwardly down there," Radke said.
"If we cut off that access they are going to be restricted to areas where they are going to be in disharmonize with their ain populations, it would have a negative touch," he added.
Source: http://www.banderasnews.com/0609/eden-animalmigration.htm
Posted by: ramirezdadogiag.blogspot.com
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