"Might", "possible", "may", "potential" all seem to be the most damning terms applied to this issue in those papers. Lots of suggestions, no proof. Given the ubiquity that the original research is suggesting the effects should be obvious and pervasive, particularly in animals with shorter lifecycles. At this point I am going to assume that if this is the best you have the answer to the question is 'no, there is no evidence but we are still looking' and that the rest of your grand claims are equally suspect.