Biomagnification of DDT

After reading about and discussing DDT in class the effects DDT had on eggshells of birds, I did some research and found this link which gives information about different insecticides. If you scroll down to the biomagnification section, within a table is a list of bird species and the amount their eggshell thickness was reduced because of DDT and DDE. I was surprised to see the amount of reduction that occurred in just these select species. I tried to find data about the reduction in eggshell thickness for the pelican and bald eagle but was not successful on finding recent or reliable sources. But, I was able to find a scientific article from 1999 printed in the International Journal of Epidemiology that studied the effects and trends of DDT in human breast milk for five decades from areas around the world. The trends show a steady decrease from the 1950s to the 1990s with the mean DDT levels being significantly decreased over the years. Latin America countries had the highest DDT concentrations in the breast milk which I think could be due to lack of regulation and extended use after other countries banned its use. It would be interesting to see if these trends still hold true in 2007 or if there has been a greater increase in DDT accumulation.