In this November 14, 2009 photo provided by the University of Florida, University of Florida researchers hold a 162-pound Burmese python captured in Everglades National Park, Fla. Therese Walters, left, Alex Wolf and Michael R. Rochford, right, are holding the 15-foot snake shortly after the python ate a six-foot American alligator. The National Academy of Science report released Monday, Jan. 30, 2012, indicates that the proliferation of pythons coincides with a sharp decrease of mammals in the park. (AP Photo/ University of Florida, Michael R. Rochford)
In this November 14, 2009 photo provided by the University of Florida, University of Florida researchers hold a 162-pound Burmese python captured in Everglades National Park, Fla. Therese Walters, left, Alex Wolf and Michael R. Rochford, right, are holding the 15-foot snake shortly after the python ate a six-foot American alligator. The National Academy of Science report released Monday, Jan. 30, 2012, indicates that the proliferation of pythons coincides with a sharp decrease of mammals in the park. (AP Photo/ University of Florida, Michael R. Rochford)
In this 2009 photo provided by the National Park Service, a Burmese python is wrapped around an American alligator in Everglades National Park, Fla. The National Academy of Science report released Monday, Jan. 30, 2012, indicates that the proliferation of pythons coincides with a sharp decrease of mammals in the park. (AP Photo/National Park Service, Lori Oberhofer)
In this Jan. 17, 2012 file photo, Secretary of Interior Ken Salazar, center, and Sen. Bill Nelson, D-Fla., left, look at at 13-foot python held by National Park Service Supervisor Ranger Al Mercado in the Everglades, Fla. The National Academy of Science report released Monday, Jan. 30, 2012, indicates that the proliferation of pythons coincides with a sharp decrease of mammals in the park. (AP Photo/Alan Diaz, File)
In this 2009 photo provided by the University of Florida a researcher holds a Burmese python near her nest in Everglades National Park, Fla. The National Academy of Science report released Monday, Jan. 30, 2012, indicates that the proliferation of pythons coincides with a sharp decrease of mammals in the park. (AP Photo/ University of Florida, Jemeema Carrigan)
WEST PALM BEACH, Fla. (AP) ? A burgeoning population of huge pythons ? many of them pets that were turned loose by their owners when they got too big ? appears to be wiping out large numbers of raccoons, opossums, bobcats and other mammals in the Everglades, a study says.
The study, published Monday in the Proceedings of the National Academy of Sciences, found that sightings of medium-size mammals are down dramatically ? as much as 99 percent, in some cases ? in areas where pythons and other large, non-native constrictor snakes are known to be lurking.
Scientists fear the pythons could disrupt the food chain and upset the Everglades' environmental balance in ways difficult to predict.
"The effects of declining mammal populations on the overall Everglades ecosystem, which extends well beyond the national park boundaries, are likely profound," said John Willson, a research scientist at Virginia Tech University and co-author of the study.
Tens of thousands of Burmese pythons, which are native to Southeast Asia, are believed to be living in the Everglades, where they thrive in the warm, humid climate. While many were apparently released by their owners, others may have escaped from pet shops during Hurricane Andrew in 1992 and have been reproducing ever since.
Burmese pythons can grow to be 26 feet long and more than 200 pounds, and they have been known to swallow animals as large as alligators. They and other constrictor snakes kill their prey by coiling around it and suffocating it.
The National Park Service has counted 1,825 Burmese pythons that have been caught in and around Everglades National Park since 2000. Among the largest so far was a 156-pound, 16.4-foot one captured earlier this month.
For the study, researchers drove 39,000 miles along Everglades-area roads from 2003 through 2011, counting wildlife spotted along the way and comparing the results with surveys conducted on the same routes in 1996 and 1997.
The researchers found staggering declines in animal sightings: a drop of 99.3 percent among raccoons, 98.9 percent for opossums, 94.1 percent for white-tailed deer and 87.5 percent for bobcats. Along roads where python populations are believed to be smaller, declines were lower but still notable.
Rabbits and foxes, which were commonly spotted in 1996 and 1997, were not seen at all in the later counts. Researchers noted slight increases in coyotes, Florida panthers, rodents and other mammals, but discounted that finding because so few were spotted overall.
"The magnitude of these declines underscores the apparent incredible density of pythons in Everglades National Park," said Michael Dorcas, a professor at Davidson College in North Carolina and lead author of the study.
Although scientists cannot definitively say the pythons are killing off the mammals, the snakes are the prime suspect. The increase in pythons coincides with the mammals' decrease, and the decline appears to grow in magnitude with the size of the snakes' population in an area. A single disease appears unlikely to be the cause since several species were affected.
The report says the effect on the overall ecosystem is hard to predict. Declines among bobcats and foxes, which eat rabbits, could be linked to pythons' feasting on rabbits. On the flip side, declines among raccoons, which eat eggs, may help some turtles, crocodiles and birds.
Scientists point with concern to what happened in Guam, where the invasive brown tree snake has killed off birds, bats and lizards that pollinated trees and flowers and dispersed seeds. That has led to declines in native trees, fish-eating birds and certain plants.
In 2010, Florida banned private ownership of Burmese pythons. Earlier this month, U.S. Interior Secretary Ken Salazar announced a federal ban on the import of Burmese pythons and three other snakes.
Salazar said Monday that the study shows why such restrictions were needed.
"This study paints a stark picture of the real damage that Burmese pythons are causing to native wildlife and the Florida economy," he said.
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Follow Matt Sedensky at www.twitter.com/sedensky
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