p/a AMBI calculated with all or with the most frequent species.

<p>Relationship between p/a AMBI calculated with all species and p/a AMBI calculated with the 10% (A) 25% (B) and 50% (C) most frequent species. Vertical and horizontal lines indicate assessment thresholds for pollution levels. Color scale as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090529#pone-0090529-g002" target="_blank">Figure 2</a>.