Emily Bernhardt (IMAGE) Duke University Caption Duke ecologist and biogeochemist Emily Bernhardt checks levels of dissolved oxygen in the waters of New Hope Creek, North Carolina Credit Photo by Véronique Koch, Duke University Usage Restrictions none 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.