To quantify trait plasticity, I calculated a plasticity index (PIv) [32] as the difference between the maximum and minimum values of the trait mean, divided by the maximum value, for each species.
http://plosone.org/article/info:doi/10.1371/journal.pone.0048821#article1.body1.sec2.sec3.p2

Due to a production error by PLOS ONE, Table 4 containing the PIv values was reproduced without decimal points. The values should all be between zero and 1. For instance, the first value in the table that reads as 133±016 should read 0.133±.016.