Why have Gulf Coast wetlands and mangrove areas been lost?

The loss of Gulf Coast wetlands and mangrove areas is primarily driven by human-induced disturbances and environmental changes. These critical ecosystems have been significantly degraded through several key factors:

• Physical Alteration: Coastal development, urban expansion, and the filling of land for building and road construction have directly destroyed vast areas of habitat. Activities such as dredging, diking, and ditching have further fragmented these landscapes.123
• Pollution and Runoff: Modern agricultural practices in the United States and Mexico contribute large amounts of chemical pesticides, herbicides, and fertilizers to the region. This runoff, particularly from the Mississippi River, leads to eutrophication and oxygen-depleted "dead zones" that suffocate marine life. Additionally, industrial waste and sewage discharge have further contaminated these waters.324
• Hydrological Changes: The construction of dams and drainage systems has altered natural water flows, depriving wetlands of necessary water and sediment.123
• Climate Change: Rising sea levels, stronger storms, and changing temperatures pose ongoing risks, contributing to the submergence of coastal wetlands.123
• Resource Extraction: Logging and offshore oil drilling have also played roles in habitat destruction and the fouling of coastal environments.23