Canopy Gap (image) Michigan State University Caption Timber harvesting that leaves gaps in the forest canopy allows sunlight and water to nurture a new generation of trees -- at least in theory. Credit Megan Matonis, Center for Systems Integration and Sustainability, Michigan State University Usage Restrictions With credit as shown. 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.