Oakland Tribune: When it comes to determining the sex of the western pond turtle, warmer temperatures produce females, while the cooler temperatures turn out the males. “Hot females, cold males,” said Nick Geist, a biology professor at Sonoma State who has been studying the turtles since last summer and recently spent a day at the Oakland Zoo determining the sex of at least 16 of the 22 turtles there through a surgical procedure. The result: 10 females and six males, zoo officials …