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E-M:/ surprising PCB levels in food web

Title: surprising PCB levels in food web
From Science News

October 5, 2005

Zebra mussels reroute contaminant flow through food chain

New research into how invasive species impact food webs suggests that some little fish may have a higher PCB concentrations than a trophy bass.

Conventional wisdom holds that contaminants such as PCBs accumulate up the aquatic food web, reaching the highest concentrations in the predatory fish at the top of the food chain.  But not in Lake Michigan's Calumet Harbor÷new research reveals that some smaller fish have higher PCB concentrations than the predators that eat them. The findings, presented at the Ecological Society of America meeting in Montreal in August, could mean that resource managers will have to revise fish advisories and sampling protocols for monitoring cleanups, experts say.