Michigan Tech Ecologists (IMAGE) Michigan Technological University Caption Rolf Peterson, Sarah Hoy and John Vucetich are researchers from the School of Forest Resources and Environmental Science (SFRES) at Michigan Tech. They lead the Isle Royale predator-prey study, the longest-running study of its kind in the world. Credit Sarah Bird/Michigan Tech Usage Restrictions please credit 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.