PCB concentration in Lake Huron
This chart shows the PCB concentrations found at the various trophic levels in the Saginaw Bay ecosystem of Lake Huron. Numbers on the x-axis reflect enrichment with heavy isotopes of nitrogen (15N), which is a marker for increasing trophic levels. Notice that the fish in the higher trophic levels accumulate more PCBs than those in lower trophic levels.
Source
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"OpenStax College, Energy Flow through Ecosystems. October 17, 2013."
http://cnx.org/content/m44887/latest/Figure_46_02_03.jpg
OpenStax CNX
CC BY 3.0.
