Multi factorial sex determination in chameleons?

[kinyonga]

"Using two independently gathered data sets on veiled chameleons (Chamaeleo calyptratus), we show that a hatchling's sex is affected by the interaction between egg mass and incubation temperature"....
https://meridian.allenpress.com/jou...ination-in-Chameleons?redirectedFrom=fulltext

 

[kinyonga]

I thought that it was disproved...that temperature for veileds did not determine sex of the hatchling.

In my unconventional incubator, the temperature fluctuated with 74F being the maximum...so they should have all been girls...but they weren't.

 

[kinyonga]

More...
"Overall, 51.6% of hatchlings were female and 48.4% male. The intermediate incubation temperature produced slightly more males than females, while the others were female biased. However, all sex ratios (Table 1) remained nearly 1:1"...
http://www.chameleonnews.com/08FebLong.html

"Dynamic Sex Chromosomes in Old World Chameleons (Squamata: Chamaeleonidae)"...
"We used RADseq and subsequent PCR validation to identify an XX/XY sex chromosome system in the veiled chameleon (Chamaeleo calyptratus), revealing a novel transition in sex chromosome systems within the Chamaeleonidae"...
https://epublications.marquette.edu/cgi/viewcontent.cgi?article=1604&context=bio_fac

 

[MzLaurie11]

Hmmm might be why they have been around since the dinosaurs. Conditions dont alter an equal number of each sex which has made them sucessful. Interesting research kinyonga!

 

[iPardalis]

"Using two independently gathered data sets on veiled chameleons (Chamaeleo calyptratus), we show that a hatchling's sex is affected by the interaction between egg mass and incubation temperature"....
https://meridian.allenpress.com/jou...ination-in-Chameleons?redirectedFrom=fulltext

There is a huge flaw in this analysis. Their study finds what we know - that there isn't a relationship between temperature and sex determination in Veiled Chameleons. However, when they start adding superfluous features such as egg size and location (US vs Australia for example), the model finds relationships that don't exist, like Australia resulting in the opposite relationship between egg size and sex, and lead them to conclude that there is a relationship between egg size and sex under different temperatures. It is written by someone who just needs to take a few more statistics and science classes. If they remove location from the model, the offsetting relationships that they discuss will actually offset and their findings will just fall away. I don't know how this got published.