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Hayes, professor of integrative biology. The 10 percent or more Casual sex Schaffhausen turn from males into females — something not known to occur under natural conditions in amphibians — can successfully mate with male frogs but, because these females are genetically male, all their offspring are male.

Though the experiments were performed on a common laboratory frog, the African clawed frog Xenopus sseekingfield studies indicate that atrazine, a potent endocrine disruptor, similarly affects frogs in the wild, and could possibly be one of the Lady seeking real sex Holiday City-Berkeley of amphibian declines around the globe, Hayes said. Some 80 million pounds of the herbicide atrazine are applied annually in the United States on corn and sorghum to control weeds and increase crop yield, but such widespread use also makes atrazine the most common pesticide contaminant of ground and surface water, according to various studies.

More and more research, however, is showing that atrazine interferes with endocrine hormones, such as estrogen and testosterone — in fish, amphibians, birds, reptiles, laboratory rodents and even human cell lines at levels of parts per billion. Recent studies also found a possible link Lady seeking real sex Holiday City-Berkeley human birth defects and low birth weight and seekin exposure in the womb.

As a result of these studies, the Environmental Protection Agency EPA is reviewing its regulations on use of the pesticide. Several states are considering banning atrazine, and six Clty-Berkeley action lawsuits have been filed seeking to eliminate its use.

The European Chats about interests already bars the use of atrazine. Working with the African clawed frog, Hayes and his colleagues showed in that tadpoles raised in atrazine-contaminated water become hermaphrodites — they develop both female ovaries and male testes gonads.

This occurred at atrazine levels as low as 0.

Subsequent studies showed that native leopard frogs Rana pipiens collected from atrazine-contaminated streams in the Midwest, including from areas up to 1, miles from where atrazine is applied, often had eggs sexx their testes.

And many males had lower testosterone levels than normal females and smaller than normal voice boxes, presumably limiting their ability to call mates.

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Those early studies were hampered by the inability to easily distinguish genetically male from genetically female frogs. They have estrogen, lay eggs, they mate with other City-Bekeley. Atrazine has caused a hormonal imbalance that has made them develop into the wrong sex, in terms of their genetic constitution.

Coincidentally, another lab in discovered a sex-linked genetic marker in Xenopuswhich has allowed Hayes to confirm the genetic sex of his frogs. In ongoing studies, Hayes is investigating whether this apparent resistance is inherited, as well as whether the sex-reversed males have more susceptible offspring.

The work was funded by the Park Water Co. Post was not sent - check your email addresses!

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