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Temperature Sex Determination in Frogs?
By Patrick Nabors - Friday, March 18 2016 Comment(s): 0  |  Overall Rating:
Changing the temperature of your tadpoles water might influence the sex of the offspring!

Over the many years Iíve been working with frogs, Iíve noticed that certain types of frogs display a skew in the sex ratio.  Dendrobates tinctorius for instance are well known for their heavy female sex ratio, while most of the thumbnail dart frogs I have worked with are heavy on males. 

Iíve often wondered why these sex ratios occur, but assumed it must have something to do with their natural history or some strategy which helped each different locality or species group survive.  For the most part these sex ratio skews are very reliable and seem to consistently appear in the offspring of various different breeders all over the US and even in shipments of frogs bred in Europe, so this lends credence to the idea that this phenomena is inherent in the frogs natural history, not something related to diet, temperatures, water ph, or any of the various factors that might influence tadpole development.

However I also work with some "non dart frogĒ type frogs, various tree frogs and terrestrial frogs, and one species in particular came to my attention as having a heavy sex ratio skew shortly after I started working with itÖthe Vietnamese Mossy frog, or Theloderma corticale.  I started breeding these frogs back in the early 2000ís. My original group was around 20 frogs that were imported from Thailand, and this group was slightly male heavy but really nothing remarkable in this regard.  However as I produced babies, and sold groups to customers I found that a year or so later I was getting a few people coming back and asking how to take care of eggs their groups were producing, but these folks always had a 3.1 or even a 5.1 group.  Other customers got all males, and frogs I held back seemed to be running at around 7 to 10 males per female.  Then I started hearing about people who had bought groups of ten or twenty from other breeders, in the US and Europe, and had gotten ALL males!  If you are interested in more on this subject, check out the article I've just posted on the site, here!


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