Ecologically harmful algal blooms (IMAGE) Purdue University Caption Jennifer Wisecaver, associate professor of biochemistry at Purdue University, looks for genetic variation in single-celled algae associated with algal blooms. Appearing on the monitor are specimens of Prymnesium parvum, which cause ecologically harmful algal blooms worldwide, including across much of the United States. Credit Purdue University photo/Tom Campbell Usage Restrictions News organizations may use this image in connection with reports about the work of Purdue University's Jennifer Wisecaver and her collaborators. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.