Nav: Home

In Minnesota, Wisconsin, New York, Vermont And Parts Of Canada: Why Are The Frogs Malformed? -- Parasites, Pesticides And/Or UV?

November 18, 1997

A workshop on Strategies for Assessing the Implications of Malformed Frogs for Environmental Health will be held Dec. 4-5 at the Conference Center at the National Institute of Environmental Health Sciences, 111 Alexander drive, Research Triangle Park, NC. Sessions begin at 8:30 a.m.

Alerted by a group of schoolchildren who spotted malformed and missing limbs in a Minnesota farm pond in 1993, and posted their observations on the Internet, biologists surveyed the situation and three years ago confirmed malformations in large numbers of frogs in that state. Then, deformed frogs were reported in Wisconsin, New York, Vermont and several others states as well as parts of Ontario and Quebec. The National Reporting Center for Amphibian Malformities has an Internet site at that lists additional areas and provides some of the key news reports on the phenomenon.

At least three theories have been put forward for the deformities: 1) chemicals, such as pesticides from nearby agricultural fields, 2) increased ultraviolet radiation due to ozone depletion, and 3) parasitic invasions. There may be more than one factor at work.

Recently, the Minnesota Pollution Control Agency and NIEHS reported preliminary research showing that water from several ponds with deformed frogs and nearby wells also caused a high incidence of malformed embryos of Xenopus laevis frogs, which are used in the Frog Embryo Teratogenesis Assay: Xenopus, known as FETAX. As a precaution, MPCA has offered free bottled water to some residents. Judy Helgen of MPCA and James Burkhart, NIEHS, will discuss their continuing work early Thursday afternoon Dec. 4, followed by a discussion of the use of "sentinel species" for ecological and human health assessments by Hank Gardner of the US Army Center for Environmental Health Research.

Gerald Ankley of the Environmental Protection Agency, who has pursued increased UV radiation from the depletion of the ozone layer, will discuss his findings Thursday morning at 11:20.

NIH/National Institute of Environmental Health Sciences

Related Frogs Articles:

Study examines pesticides' impact on wood frogs
A new study looks at how neonicotinoid pesticides affect wood frogs, which use surface waters in agricultural environments to breed and reproduce.
Frogs have unique ability to see color in the dark
The night vision of frogs and toads appears to be superior to that of all other animals.
Male poison frogs become cannibals after taking over territories
Systematic 'infanticide' of unrelated young occurs in several animal species.
Seven new species of night frogs from India including 4 miniature forms
Scientists from India have discovered seven new frog species belonging to the genus Nyctibatrachus, commonly known as Night Frogs.
Reversible saliva allows frogs to hang on to next meal
A Georgia Tech study says a frog tongue's stickiness is caused by a reversible saliva in combination with a super soft tongue.
More Frogs News and Frogs Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Do animals grieve? Do they have language or consciousness? For a long time, scientists resisted the urge to look for human qualities in animals. This hour, TED speakers explore how that is changing. Guests include biological anthropologist Barbara King, dolphin researcher Denise Herzing, primatologist Frans de Waal, and ecologist Carl Safina.
Now Playing: Science for the People

#534 Bacteria are Coming for Your OJ
What makes breakfast, breakfast? Well, according to every movie and TV show we've ever seen, a big glass of orange juice is basically required. But our morning grapefruit might be in danger. Why? Citrus greening, a bacteria carried by a bug, has infected 90% of the citrus groves in Florida. It's coming for your OJ. We'll talk with University of Maryland plant virologist Anne Simon about ways to stop the citrus killer, and with science writer and journalist Maryn McKenna about why throwing antibiotics at the problem is probably not the solution. Related links: A Review of the Citrus Greening...