Figure 2From: Biological traits and community patterns of Trichoptera at two Patagonian headwater streams affected by volcanic ash deposition Mean caddisfly density (bars, +SD) and species richness (dots). At pre (May 2007 to Apr 2008) and post-eruption (Jun 2008 to Mar2010) dates, at Nant y Fall and Chiquito Streams (Patagonia, Argentina).Back to article page