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Food Web Dynamics Influence Mercury Movement in Grand Canyon

Detailed Description

USGS scientist Anya Metcalfe fly fishes in front of the Glen Canyon Dam in hopes of catching fish to analyze for mercury levels. This is part of a study to help determine how food web dynamics influence the movement of mercury throughout the Colorado River in the Grand Canyon. 

Sources/Usage

Copyright: David Herasimtschuk/Freshwaters Illustrated

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