Dolphin (IMAGE) Penn State Caption Warming ocean surfaces will decrease the oxygen in the upper oceans and decrease bioproductivity, impacting the food source for dolphins and others that rely on fish and sea life. Credit NOAA Usage Restrictions None License Licensed 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.