Relationships among trophic levels and lobster fishing intensity.

<p>Data represent the mean values for the eight sites shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049396#pone-0049396-g002" target="_blank">Figure 2</a>, each datum pooled across all eight years (2001–2008) (excluding the missing few data described in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049396#pone-0049396-g002" target="_blank">Figure 2</a>). (A) Urchin density as a function of fishing intensity, measured as the mean daily number of lobster traps pulled (“sampled”) per km⁻² of each fishing polygon (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049396#pone-0049396-g001" target="_blank">Figure 1</a>). (B) Total macroalgal biomass as a function of urchin density. (C) Macroalgal biomass as a function of fishing intensity.