|Solar Radiation Wiping Out Frogs|
exposure of amphibians to damaging levels
of ultraviolet-B radiation in sunlight is likely a significant part of
global amphibian declines, according to scientists from the United
Canada and Spain who outlined their understanding of UV-B's biological
effects on amphibians in an article in Ecology, a professional journal.
"At this point, we believe the broad body of research conclusively demonstrates that UV-B radiation can cause damage to many species of amphibians at every stage of their life cycle, from egg to adult," said Andrew Blaustein, a professor of zoology at Oregon State University and the lead author on the Ecology commentary. "It appears the damage may be even worse than we originally thought a few years ago, and it's clear that rising levels of UV-B radiation, which could be caused by erosion of Earth's protective ozone layer, can play at least a part in the amphibian declines we're seeing around the world."
Most scientists now believe, Blaustein said, that a wide range of causes explain the totality of amphibian declines, and those causes include habitat destruction, disease, parasites, introduced exotic species, environmental contaminants and other aspects of global climate change. In some cases complex chains of interlaced ecological effects can lead to amphibian disease, deformity or death.
But UV-B radiation is still high on the list of concerns, the researchers say.
"At first our field studies showed only the damage that increased levels of UV-B radiation could do to amphibian embryos, where they caused mortality in some species and not in others," Blaustein said. "But with more research we've seen how UV-B radiation can affect growth and development in larvae, cause changes in behavior, some deformities, and make the amphibian more vulnerable to disease and death. And in adults, it appears that UV-B radiation can cause retinal damage and blindness."
The evidence gathered from numerous scientists around the world is both alarming and compelling, Blaustein said. Every single amphibian species exposed to natural levels of UV-B radiation has now been found to have some type of health problem, either immediately or later in life.
"Given the numerous other organisms and biological systems that other scientists have already demonstrated to be impacted by UV, it makes sense that some amphibians too would be sensitive to UV radiation," said Lee Kats, a professor of biology at Pepperdine University and another author of the Ecology study.
Some recent studies that have questioned these effects did not have an adequate base of field experiments, made too many assumptions about how UV-B radiation in the life cycle of one species would relate to other species, and fail to understand the natural behavior of amphibians and their evolution, the researchers said in their Ecology article.
"For instance, some researchers have now theorized that amphibians could avoid the effects of UV-B radiation simply by avoiding sunlight or laying their eggs in deeper water," Blaustein said. "But that ignores millions of years of evolution, in which amphibians have developed certain types of behavior for specific reasons. Some species lay their eggs in warm, shallow waters because they are seeking sun and heat, and they need to hatch and grow quickly before the water evaporates or freezes.
"Those types of behavior do not change overnight just because the Earth's atmosphere may have changed," he said. "It's not that simple. Moreover, as ponds dry and water levels decrease, amphibians cannot just get out of the sunlight, and they are bombarded by intense UV radiation."
Amphibian declines are an issue that first came to light about 15 years ago and have raised warning flags among many ecologists, who believe they may be a harbinger of ecological changes that are first affecting some of Earth's most sensitive animals and may later cause more widespread damage to other species.
Aside from amphibian deaths, population declines and localized extinctions, another issue that has raised concern is amphibian deformities. A near epidemic of deformed legs, eye damage and other ailments 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 other species in parts of the Oregon Cascade Range have approached 100 percent in some recent years.
Fossil Frogs and Toads
of North America
by J. Alan Homan
Indiana University Press, 2003
This is a unique and comprehensive guide to frogs and toads that croaked in what is now North America long, long ago. Many are now extinct; some are related to or ancestors of modern species.
Relatively little has been previously written about the fossil record of the Anura ("anurans") order of amphibians, largely because their fragile remains generaly make poor fossils, and because the bones of large vertebrates (dinosaurs and mammoths) are easier to study.
Dating back to the Jurassic period more than 190 million years ago, frogs and toads are some of the oldest surviving species on earth. Today they are among the most endangered by extinction. "It would be unthinkable to allow this highly specialized and fascinating group of vertebrates to disappear from the Earth in a mere instant of geologic time because of human neglect and exploitation of the environment," author J. Alan Holman points out.
Holman's study starts off with a review of the order Anura and a brief history of its fossil record. He explains the evolution of Anura and provides a thorough accounting of the North American frogs and toads that have been collected to date, including the locations where each fossil was found.
The book concludes with an epoch-by-epoch chronology of anuran development and change, an epilogue on the state of the art of classification and phylogeny of anurans, and a comprehensive list of references. A site index in the back of the book provides a fascinating record of where fossil anurans have been uncovered, from the Jurassic remains found in Gold Springs of Arizona to Pleistocene fossils unearthed at Meskill Road and Shelton in Michigan.
Farewell to Frogs:
Investigating Declining Amphibian Populations
Ag Chemicals Wiping Out Frogs
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