In laboratory experiments, water contaminated with methoprene resulted in frog malformities, while control water, without the chemical, did not produce malformities. Isn't this pesticide causing the frog deformities? Isn't this pesticide causing the frog deformities? Toxicity of methoprene as assessed by the use of a model microorganism. When the researcher exposed frogs to two methoprene breakdown products such as cismethoprenic acid and transmethoprenic acid formed on exposure of uv radiation, they developed serious deformities within 96 hours. It was found to be a possible cause of a sharp rise in the incidence of frog deformities throughout North America. [1] Using Altosid to kill mosquito larvae. For northern leopard frogs (Rana pipiens), the species most commonly found in Minnesota, 6.5 percent of 13,763 frogs collected were malformed. —Preceding unsigned comment added by 67.164.65.21 03:21, 11 April 2008 (UTC) No, that is atrazine. Markjoseph125 05:31, 19 July 2008 (UTC) I've just read that it was the leading candidate for explaining growth abnormalities in frogs as recently as 2003. There are deformities in frogs and many scientists working on the deformed frog problem believe that the cause is a chemical one. Some biologists suspected methoprene might have a similar effect on frogs. Severe deformities and malformations have been reported in amphibian populations with growing frequency since the early 1990s. Amphibian deformities Frogs, toads, and salamanders with extra limbs have gen-erated scientific curiosity for centuries (Van Valen 1974; Ouellet 2000). Malformed frogs have been found throughout Minnesota (fig. Moreno, V.M.C. Methoprene may have severe develop-mental effects on frogs. limb deformities found in the North American frogs (Conlan 1996). The wetlands were created on an impermeable foundation for research purposes and …

The recent increase in this phenomenon, however, is notable for its severity. Madeira. Malformed frogs first came to national attention in 1995. Methoprene also has a moderate toxicity towards both warm and cold water, freshwater fish, although exposure of these organisms is limited due to methoprene’s rapid degradation in unshaded water. Six additional macrocosms were sprayed with Abate4E, containing the organophosphate pesticide temephos, and six were sprayed with water (controls). methoprene) through the summer following label directions. These deformities include ectopic and supernumerary limbs and missing limbs, limb segments, or digits.

During the summer of 1997 we repeatedly sprayed Altosid, a formulation of 4% methoprene used for mosquito control, on six constructed macrocosms. In laboratory experiments, water contaminated with methoprene resulted in frog malformities, while control water, without the chemical, did not produce malformities. One of the most likely chemical candidates for causing such deformities is methoprene, a synthetic insect growth hormone (IGH) that is sprayed in problem areas in order to control pests such as mosquitoes. Although methoprene has a little effect on developing amphibians, if it is exposed to ultraviolet (uv) rays, it can cause serious deformities. —Preceding unsigned comment added by 67.164.65.21 03:21, 11 April 2008 (UTC) No, that is atrazine. In a se-ries of experiments in the late 1990s, the EPA in Minnesota did show that high amounts of retinoic acid could trigger poor formation of hind limbs in frogs, but comparable tests with methoprene caused no malformations at all. It contains 1.5 percent S-methoprene. A field study of the use of methoprene for West Nile virus mosquito control. Objectives/Hypothesis: The goal of our studies is to assess the significance of endocrine disruptors that activate retinoid signaling pathways for the development of deformities in frogs, and to understand their mechanism of action so as to better assess the implications for human health. Markjoseph125 05:31, 19 July 2008 (UTC) I've just read that it was the leading candidate for explaining growth abnormalities in frogs as recently as 2003. Malformations have been reported in at least 44 states and in more than 50 species of frogs and toads.


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