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temperature sex determination in snakes
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by puffadder7 on March 20, 2009
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i know that TSD can happen in crocodilians, but can it happen in snakes, for example more female crocidiles are produced at lower temperature, and more males are produced at a higher temperature. some people say it can not happen, but they have no proof, arin
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RE: temperature sex determination in snakes
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by Bobby123 on March 21, 2009
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I read somewhere that some snake colour morphs have been produced by keeping the animals cooler during gestation.
Im not 100% sure on the details of this, but there was a case of Nitschei thet were bred and kept very cool during gestation. This resulted in only 7 males being born however I could be wrong.
Good topic though.
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RE: temperature sex determination in snakes
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by najasuphan on March 21, 2009
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I was reading the article on TSD over at venomstreet.com and he has had some convincing proof that it does happen. It was with two different species of cobras so far and the results he has had seem pretty convincing. It's definitely an interesting read. -Jamie
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RE: temperature sex determination in snakes
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by FSB on March 21, 2009
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There are actually three different types of TSD that have been identified: Pattern Ia, only found in turtles, produces females at the higher incubation temperature (above a certain threshold or pivot temperature), males below that point. Pattern Ib, found only in some crocodilians, is the reverse of that, producing males at the higher temperature, females below the threshold. Pattern II, found in still other crocodilians as well as some lizards and turtles (including snapping turtles) actually has two thresholds, a higher and a lower. Females are produced both above the higher threshold and below the lower threshold, while males are produced at temperatures between the two. I still haven't heard of TSD occurring in snakes, but of course that doesn't mean it never happens- just that no one has definitively observed and recorded it, that I'm aware of.
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RE: temperature sex determination in snakes
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by earthguy on March 22, 2009
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Anybody ever hear of statistics? It's late, I'm tired, and I did this with pen and paper...but I think that based on the venomstreet data that I saw you would have to accept the null hypothesis (from a nonparametric binomial test) that there is no difference in sex ratios. Bisically the sample size is too small. But feel free to check my math. As I said it's been a long day. Intersting subject though.
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RE: temperature sex determination in snakes
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by Buzztail1 on March 22, 2009
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I would say that there are clearly people who believe that it can happen with snakes.
Obviously there are people who believe it can't.
Why not keep records of your own results, vary the temps over several incubations, and write your own paper based on your observations?
At least you will have your own data with which to support your position.
R/
Karl
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