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Temperature dependant Sex determination |
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Adderz
Member Joined: 01 Mar 2011 Location: United Kingdom Status: Offline Points: 17 |
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Posted: 08 Jul 2012 at 10:38am |
Hi everyone,
I was wondering if anyone knew if Sand Lizards exhibit TDSD? I have looked through literature and can find no mention of it, so I am guessing its a no. However, would be nice to have it confirmed. Cheers Rob
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I started out with nothing and I've still got most of it left....
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liamrussell
Senior Member Joined: 13 Jan 2005 Status: Offline Points: 100 |
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No they don't. However the females do seem to be able to bias the sex ratios of clutches one way or another depending on the quality of their mate. It's not entirely clear how they do this.
Edited by liamrussell - 08 Jul 2012 at 5:04pm |
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AGILIS
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1689 |
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I would certainly think the temps affect hatchings ,and would also think this wet weather has a down affect.,I would think Chris or Steve Langton woulds have the best info on this .keith
Edited by AGILIS - 08 Jul 2012 at 7:13pm |
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LOCAL ICYNICAL CELTIC ECO WARRIOR AND FAILED DRUID
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Iowarth
Admin Group Joined: 12 Apr 2004 Status: Offline Points: 743 |
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Certainly, as stated by Liam, all of us who breed this species can confirm that there is absolutely no evidence to support TDSD in them - or, indeed, any other Lacertid. Incubation temperatures, combined with humidity and food availability/quality to the females certainly do affect hatchlings in other ways. This relationship is, however, very complex - as an example, in a previous year, I have had significantly larger hatchlings than another breeder although I used higher temperatures (albeit extremely variable ones). This, of course, is the opposite of what would be expected but also evidences the complex inter-relationship of the various factors. So far as the weather is concerned the effect I am aware of on the captive breeding populations appears to have been profound. Limited feeding opportunities coupled with lack of "egg-cooking" basking weather have combined to produce late clutches, small clutches and clutches with a very low viability rate. Some adult females in some vivaria haven't even been seen for a number of weeks. I would expect wild populations to be exhibiting the same problems although, of course, each and every wild and captive colony has its own micro-climate and some animals somewhere may have had a better season. Even so, there has to be a question mark over the success of natural incubation in these conditions. Chris |
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Chris Davis, Site Administrator
Co-ordinator, Sand Lizard Captive Breeding Programme (RETIRED) |
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