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Romer article: Apisto pH /temp /sex ratio

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Admin
Post subject: Romer article: Apisto pH /temp /sex ratio
Posted: Fri Jan 08, 2016 3:39 pm
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Romer article on Apisto pH / temperature / sex ratio of offspring :

Cacatuoides
....................................................pH ....................................
Temp .....| ........ 4.5 ..........|......... 5.5.......... |......... 6.5 ..........
f .... c .... | male ....| female ..| male ....| female ..| male ....| female ..|
73.4 ..23... ___________________ 19.8% .... 80.2% ... ___________________
78.8 ..26... 84.3% .... 15.7% ...... 62.7% .... 37.3% ... 43.3% .... 56.7% ..
84.2 ..29... ____________________ 83.0% ... 17.0% ... ___________________


Agassizii
....................................................pH ....................................
Temp .....| ........ 4.5 ..........|......... 5.5.......... |......... 6.5 ..........
f .... c .... | male ....| female ..| male ....| female ..| male ....| female ..|
73.4 ..23... 42.2% .... 57.8% ..... 77.3% ..... 22.7% ... ___________________
78.8 ..26... 60.2% .... 39.8% .... __________________ ___________________
84.2 ..29... 9.10% .... 90.9% ..... 73.0% ..... 27.0% ... ___________________


It looks to me like both temp and pH affect the sex ratios; but differently for cacatuoides vs agassizii.

It seems like for A cacatuoides:
Lower temp drives more females (look at column of pH 5.5)

Higher pH drives more females (look at row of 78.8 F)
A agassizii seems a bit less clear:


Maybe (or maybe not) higher temp drives more females (look at column of pH 4.5 vs 5.5)

Higher pH appears to produce fewer females (look at row of 73.4 F and 84.2 F)

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