Salt marshes* are important coastal habitat that may have a role in protecting coastlines from the effects of storm surges. Global estimates of the disappearance of coastal salt marshes lies between 25-50%. Rising sea levels are generally known to contribute to this loss, but local factors are also important. Geographers study the nutrient flux into salt marsh areas in order to better understand how local factors contribute to the loss of this ecosystem.
*Salt Marsh is mud or sand flat that is colonised by salt-tolerant plants that can cope with being submerged twice a day by tides.