Mina (IMAGE) Penn State Caption Researchers repeatedly downloaded data at each of the vernal pools in the study, where they installed sensors and measured dissolved oxygen, oxidation-reduction potential, water level, water temperature, electrical conductivity, pH, and rainfall throughout the study period. Credit Heather Gall Research Group, Penn State Usage Restrictions Non commercial use only 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.