Tag: "toads" at biology news
Excess levels of nitrogen, phosphorus linked to deformed frogs
...have shown that certain pesticides cause frogs and toads
to become hermaphrodites, impairing reproduction. Other have shown that the depletion of the ozone layer, caused by industrial pollutants, exposes frogs and frog eggs to excessive ultraviolet radiation, which can slow growth rates, damage the immune...
Concerns remain about UVB damage to amphibians
...s has been found in more than 60 species of frogs, toads
and salamanders in 46 states and across four continents. At one site near Corvallis, Ore., 75-80 percent of the frogs are deformed, mostly linked to a parasite and other ecological changes. And egg mortality in embryos of the western toad and some ot...
History of frog deformities suggests emerging disease
...idely observed. To date, severely malformed frogs, toads
and salamanders have been found among 60 different...e emergence of more and more deformities in frogs, toads
and salamanders. While some scientists are investigating changes in pollution or climate, Johnson is...
Scientists hone in on cause of amphibian deformities
...e now been found in more than 60 species of frogs, toads
and salamanders in 46 states and across four continents. Of these three leading causes, the parasite appears to be the major cause of many of the deformities, the scientists say. "We've finally synthesized from a wide body of research the range of c...
Pesticides linked to amphibian declines
...f amphibian decline half of the state's frogs and toads
are in trouble -- and new research suggests that agricultural pesticides may be one of the biggest reasons. "Declines of four...species were strongly associated with the amount of upwind agricultural land use, suggesting that wind-borne agrochemical...
Fragmentation may be linked to local amphibian extinctions
...d salamanders moved almost eight times farther and toads
moved more than three times farther (spotted salam...eet in the forest and old field, respectively; the toads
moved 108 vs. 33 feet, respectively). The juvenile toads' preference for the forest came as a surpr...
Drinking through your pelvic region?
...drinking. During periods of rehydration, frogs and toads
adopt a posture termed "water absorption response"...d rates of blood flow in the seat patch skin while toads
were exhibiting water absorption behavior. The Study A new study has been undertaken to asse...
Widespread amphibian deformities caused by parasite
... physical deformities such as extra legs in frogs, toads
and other amphibians in the western United States is most likely caused by infection with a certain type of parasite, researchers said in a major study released this week. The existence and number of those parasites is dependent upon the presence of...
Lizards and salamanders may use lungs to hear, study says
...ome types of earless frogs and toads
use their lungs to pick up sound vibrations, said Thomas Hetherington, an associate professor of Evolution, Ecology and Organismal Biology at Ohio State. The results of the current study su...
Fish-stocking may spread amphibian disease
... western toad eggs from Lost Lake, Oregon. Western toads
have declined severely since the late 1980s, and up to 90% of the toad embryos have died at sites with Saprolegnia outbreaks. Laboratory experiments confirmed that trout can spread the fungus to toad embryos: exposing the embryos to infected trout i...
Amphibian mortality linked to global climate change
... says Kiesecker. In early spring every year, the toads
lay their eggs in one big communal mass that may c...e melts earliest. "We have to be ready before the toads
explode into the pond from the surrounding woodlands for their annual three to five days of breeding...
Amphibian mortality linked to climate change
...ome of the damaging effects of UV-B radiation. The toads
have evolved to always lay their eggs in the same location with relatively shallow water that, in the past, apparently provided the optimal combination of warmth for quick hatching and adequate protection from UV-B radiation. But when the water lev...
USGS: Contaminants may play important role in California amphibian declines
...d frogs, mountain yellow-legged frogs and Yosemite toads
have occurred in California over the last 10-15 years, but no single cause for these declines has been positively identified. Scientists and managers have been especially concerned because many of these declines occurred in some of the state's most s...
USGS diagnoses causes of many US amphibian die-offs
...untain National Park where state-endangered boreal toads
are dying from chytrid fungus infections that are very similar to those that killed boreal toads
in the park and other regions of the state in 1999....
New USGS research shows how land use affects amphibians
...ral areas and farms may be friendlier to frogs and toads
than urban areas. Dr. Melinda Knutson, a conservation scientist with the U.S. Geological Survey, said the research on frog and toad populations in two Midwestern states shows that frog and toad abundance and species richness were low in urban areas b...
Chytrid fungus associated with boreal toad deaths in Rocky Mountains
...hibians.html Recent deaths of endangered boreal toads
in Rocky Mountain National Park have been linked t...sts have been monitoring two populations of boreal toads
in Rocky Mountain National Park for the past 9 years. One of these two park populations of toads
USGS seeks citzens of all ages to listen for frogs and toads
...he melodious calls of Pacific treefrogs and Arroyo toads
in California filling the evening air, the second ...o join Frogwatch USA to begin to monitor frogs and toads
in their communities and to help communities become better prepared for the environmental challenges...
Link between climate change, amphibian declines explored
...the three largest populations of endangered boreal toads
in Colorado, two are now infected with the fungus, said Carey. The largest boreal toad populations in the state are found in Rocky Mountain National Park, the Collegiate Peaks in the central Colorado mountains and in Clear Creek County on the Easter...
ASU scientists probe salamander mysteries
... some of the world's most pristine habitat. Golden toads
have completely disappeared from the highland rainforests of Panama, after being infected not by a virus, but by a fungus. The microscopic water-borne fungus, called a chytrid, has also wiped out frogs in Australia and the National Zoo, and has made ...
USGS releases assessment of nation's biological resources
...ample, said Groat, in the Rocky Mountains, western toads
now occupy lessthan 20 percent of their previous range, and prairie dog populations havedeclined an estimated 98 percent. And in the Southeast, 73 percent of thefreshwater mussels are at risk. The report does document some good news, said Dr. Michael...