WALLAND, Tenn. (AP) 9/22/10— A
University of Tennessee student is catching and testing water snakes for
viruses that have killed a large amount of frogs and salamanders around the
world.
Stephen Nelson, who is a
senior majoring in wildlife and fisheries management, has spent the last two
years testing northern water snakes for ranavirus, which is actually a group of
viruses. The Knoxville News Sentinel (http://bit.ly/OMZux8) reports his project
is the first to test all North American snakes for ranavirus.
The virus was linked in the
1980s to large-scale amphibian deaths, but recently has been found in box
turtles, including those at the Oak Ridge Arboretum. Especially with the
disease's jump to turtles, which are reptiles, biologists are trying to find
out how it spreads.
During a recent trip to Little
River in Blount County, Nelson caught a northern water snake with the help a
couple of local teenagers who told him they had just seen one disappear under a
rock.
Nelson waded into the water,
gently raised the rock and found a 24-inch specimen with alternating bands of
reddish-brown and gray. Nelson says researchers are trying to figure out how
the ranavirus can be present in ditches and other places that stay dry part of
the year and should be virus-free.
"We figure something is
bringing the virus back to these ponds whenever they fill up," Nelson
said. "Water snakes can travel in between bodies of water. They could be
the host."
It's not even known if
northern water snakes carry the disease, but studies show that hellbenders do —
and small hellbenders are part of the snake's diet. After catching the snakes,
Nelson swabs them and takes the samples to a UT lab where they are tested for
ranavirus. The project will end in the fall when the northern water snakes
start hibernating.
So far, he has caught 17
northern water snakes on the Little River; he hopes to get 30.
"They're elusive,"
Nelson said. "They're bad about diving in the water and getting away. I've
had to grab them as they swim down rapids."
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