High and Low Marsh (IMAGE) Virginia Institute of Marine Science Caption Low marsh -- the low-lying zone of salt-tolerant plants first and most impacted by rising waters -- is where dynamic feedbacks operate most effectively to counter the increase in water levels. Credit © M. Kirwan/VIMS. Usage Restrictions One-time 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.