Results from the principal components analysis performed on species-specific temporal trends in the four biological variables.

<p>(a) Each point represents a species; abbreviations are given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0175735#pone.0175735.t002" target="_blank">Table 2</a>. The first two axes explained 61.6% and 24.9% of the total variance, respectively. (b) Arrows represent the projection of the four trends in biological variables on the two dimensional space defined by the correlation circle.