Gunderson and Leal's Framework (IMAGE) University of Missouri-Columbia Caption Gunderson and Leal's conceptual framework for thermal constraints on ectotherm activity. Probability is shown as a black dot, vigor is the area of each circle, and modes of activity are indicated by letters. Credit <I>Ecology Letters</I> 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.