Uwe Romer's study on sex ratios, temp, & pH

[mengerin@cs.utexas.edu]

Ok, here's a summarization from Jan, 1997 TFH's Wayne's new World.

Correlation between temp & sex ratio was significant for 33 species.

At 23C ratio was skewed towards females.
At 29C   "    "    "       "    males  

A. caetei was an exception which did not skew relative to temp.
However, pH was a role in A. caetei which did not influence the others
as did temp.  

There does seem to be windows for when temp can make a difference.

Broods transfered to the opposite temp had the following results

After 33 days had characteristic of their initial spawning temps.
Up to 3 days had the characteristics of the final temp in transfer
After 3-33 days had a proportional and linear distribution relative
to the time line (so transfer at 15 days produced a nearly 50/50 ratio).

Buy the mag for more details.

				Cheers,
				Matthew