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Opaque tubes were used to sample phytoplankton for measurements of C14 primary production. Tubes were assembled to the correct length to remove water from the epilimnion, the metalimnion, or the hypolimnion. Tim Meinke and Andy Juele are draining the water from the tube into a thermal cooler that excluded light and air.
Site: Crystal Lake
Date: Summer 1987
Photographer: University of Wisconsin Archives

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