Scientific Discoveries this Week – 10/20/14
Japan- Dr. Misao Fukuda of the M&K Health Institute in Japan found evidence to support the possibility that human sex ratios may be influenced by temperature, although in a more subtle way, through a different mechanism. Research shows that in 1968, 1.07 boys were born in Japan for every girl. By 2012, that was down to 1.05. “Male conception seems to be especially vulnerable to external stress factors, including climate changes,” Fukuda concludes. Furthermore, Fukuda investigated the data for fetal deaths in the ratio of male to female, which were 2 male per female. Nonetheless, changes to sex ratios for humans are so small that, there is no threat to our survival. But, “an increase in miscarriages for all fetuses may be one more effect of rapidly changing climates,” Fukuda says.