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Tyrone Hayes. Tyrone B. Hayes (born July 29, 1967) is an American biologist and professor of integrative biology at the University of California, Berkeley. He is known for his research in frogs, concluding that the herbicide atrazine is an endocrine disruptor that demasculinizes male frogs, causing them to display female characteristics.
Conspiracy theories alleging that governments are using endocrine disrupting chemical pollutants in the water supply to create an alleged increase in the gay, bisexual or transgender population were popularized in the 2010s. Most notably, American conspiracy theorist Alex Jones cited research on the effects of atrazine on frogs, which can ...
Atrazine has been a suspected teratogen, with some studies reporting causing demasculinization in male northern leopard frogs even at low concentrations. [49] A 2002 study by Tyrone Hayes , of the University of California, Berkeley, found that exposure caused male tadpoles to turn into hermaphrodites – frogs with both male and female sexual ...
In Minnesota, pesticide use has been linked causally to congenital deformities in frogs such as eye, mouth, and limb malformations. [21] Researchers in California found that similar deformities in frogs in the U.S. and Canada may have been caused by breakdown products from pesticides whose use is categorized as not posing a threat. [22]
Environmental toxicology is a multidisciplinary field of science concerned with the study of the harmful effects of various chemical, biological and physical agents on living organisms. [1][2] Ecotoxicology is a subdiscipline of environmental toxicology concerned with studying the harmful effects of toxicants at the population and ecosystem ...
The northern leopard frog is a fairly large species of frog, reaching about 11 cm (4.3 in) in snout-to-vent length. It varies from green to brown in dorsal color, with large, dark, circular spots on its back, sides, and legs. [7] Each spot is normally bordered by a lighter ring. A pair of dorsolateral folds starting from the back of the eye ...
Also, eye defects in rat foetuses could be the effect of toxic properties of cyanazine. [23] Synergistic toxicity; Different triazine herbicides appear to have a synergistic effect on specific animal species. In the case of cyanazine, atrazine can cause effects on non-target species like Chironomus tentans.
A chytrid-killed frog. Chytridiomycosis in Atelopus varius —two sporangia containing numerous zoospores are visible. Chytridiomycosis (/ kaɪˌtrɪdiəmaɪˈkoʊsɪs / ky-TRID-ee-ə-my-KOH-sis) is an infectious disease in amphibians, caused by the chytrid fungi Batrachochytrium dendrobatidis and Batrachochytrium salamandrivorans.