Toxic lake algae warning sign
Photo by UW-Madison, University Communications
© Board of Regents of the University of Wisconsin System
File ID: 15485
File name: toxic_algae_lake12_1105.jpg
File type: NIKON D3
Caption: On July 16, 2012, one of several signs posted along Lake Mendota near the Memorial Union Terrace at the University of Wisconsin-Madison warn against swimming during the presence of toxic blue-green algae in the water. Known as cyanobacteria, the algae are photosynthetic bacteria that live in colonies, typically in lakes with excess fertility. (Photo by Jeff Miller/UW-Madison)
Photo by: Jeff Miller
Date: 2012
Specs: NIKON D3, f/4.0, 1/800, 17.0 mm