Purple Benthic Mats - Middle Island Sinkhole

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Uploaded by on Sep 15, 2009

Middle Island sinkhole in the Thunder Bay National Marine Sanctuary near Alpena, MI. This video shows the transition from rock walls of the sinkhole into the region affected by groundwater. More purple cyanobacterial mats can be seen in the area close to the sinkhole wall. Video provided by the Great Lakes Environmental Research Laboratory - http://www.glerl.noaa.gov/

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