impact wrenches
human impacts on salt marshes a global perspective
salt marshes are vitally important coastal ecosystems that filter water buffer against storm erosion and provide essential nursery habitat for important fishery species . long thought to be resistant to ecological perturbations salt marshes are now known to be highly sensitive indicators of environmental change and impacts . this state of the science volume details how humans have modified salt marshes around the world and why these critical habitats desperately need protection . it also offers clear recommendations about what should be done to remediate current threats and restore the structure and function of salt marsh ecosystems .