Reptile Forum, Reptile Classifieds - CaptiveBred

Rickeezee · Posted: Mon Nov 06, 2006 5:57 pm Post subject: Question

Anyone have any ideas on why European Zoos when breeding Theloderma Corticale have 100% incident rate of male only offspring?

Temperature requirements and potential affects at various developmental stages has been done to death. So it's not that.

My suggestion was pollutants that affect gender in the water supplies, have been told if this is the case why is this a widespread issue? Also why would private keepers not experience this when using the same water supplies. Good point!

Also certain Captive bred examples (although extremely rare) do not show this tendency? Good gender balance is maintained. Without name dropping I have been asked this question by someone eminent within the field of amphibian research. I hasten to add I was not asked this because they think I have a font of knolwedge, but simply because we were discussing Theloderma Corticale. The question has just intrigued me and now I want to know why this occurs.

The person suggested that perhaps the reason may be that in their view private keepers generally keep small collections better than some examples are kept in Zoos, he was not for one minute suggesting however that Zoos do not keep amphibs in good conditions, if u get my drift.

Even if this is the case how and why would this affect gender balance in offspring? So waht are the causative factors?

Any ideas anyone?

A few pics of some of my TC's.
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Pollywog · Posted: Mon Nov 06, 2006 6:21 pm Post subject:

Rickeezee · Posted: Mon Nov 06, 2006 6:26 pm Post subject:

Well this question came from the head keeper for Herpetology at LZ. So I would not really doubt him on this. Unless he was meaning one particular European Zoo.

So do you have a theory Andrew.
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Pollywog · Posted: Mon Nov 06, 2006 6:54 pm Post subject:

Rickeezee · Posted: Mon Nov 06, 2006 7:03 pm Post subject:

So are you going to share your theory? I am interested in this hence my post.

Ian I am sure will be delighted to discuss this. He seems to be open to sharing info out of the common interest of amphibians, and as he is HK at LZ this bodes well for the issue you suggestd in the previous post regarding communication. The more people share the better in my view.
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Pollywog · Posted: Mon Nov 06, 2006 7:21 pm Post subject:

Rickeezee · Posted: Mon Nov 06, 2006 7:37 pm Post subject:

Pollywog · Posted: Mon Nov 06, 2006 8:16 pm Post subject:

Rick,

My withholding of this information is nothing against you or any other member of this forum. I am open to sharing information which I think is evident by my involvement in many forums, magazines, websites etc. anyone that has ever asked me a question would testify to the fact that I keep very little back. But there are certain circumstances under which I have to hold back some information and the discussion of zoological collections is one of these times.

I work as a consultant to zoological organisations & other educational establishments and as such I have set guidelines that I work by. The main being that any information concerning their collections is kept between them and me.

Once I have spoken to the people involved then I may make that information available later but only with their permission to release such information.

Please note once again that this choice to withhold information is nothing against yourself or any other member of this forum.
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Pollywog
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7109 · Posted: Mon Nov 06, 2006 8:19 pm Post subject:

i admit they are very nice mint colouration very nice Smile

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Leopard Geckos
Common Boas
Black Rat Snake
Royal Python
Fire bellied Toads
And a Nutty Staffy

Rickeezee · Posted: Mon Nov 06, 2006 8:40 pm Post subject:

Fair play Andy I didn't take your responses any other way than I am sure they were intended, I did however find them a tad enigmatic at times though. Very Happy

I wouldn't take anything on a personal level either, I have no need to. Just thought it was a basic question. Kinda wished I hadn't asked now. Laughing

But I read with interest your reasons for not being able to discuss your theory.

Luckily I am not bound by any such contractual or set guidelines. It was based upon a light general open discussion with Ian nothing more nothing less.

I do however understand precisely where you are coming from though.

So back to the original question Very Happy

for anyone else out there with any ideas, why might there be a 100% male gender offspring from these frogs? Could be an interesting debate / discussion?
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