Yes, it is not unusual for salt marshes to experience dieback in small patches in some years. However, these areas are usually less than an acre or so in size and generally regenerate the next year or over the next several years.
The phenomenon of brown marsh has been observed along Louisiana's coastline. Hardest hit is the Barataria-Terrebonne estuary extending from the west side of the Mississippi River to the Atchafalaya River.
Coastal marshes provide essential habitat and nurseries for fish and habitat for migratory and non-migratory birds, mammals, reptiles, and amphibians.
Effects to industries such as oil and gas cannot be predicted, but healthy marshes and barrier islands are known to be important storm buffers to Louisiana's mainland.
Wetlands are transitional areas, sandwiched between permanently flooded deepwater environments and well-drained uplands,  here the water table is usually at or near the surface or the land is covered by shallow water.
Brown Marsh is a term that scientists have given to the unusually extensive and rapidly spreading browning of Louisiana’s normally lush green intertidal saltwater marsh grass Spartina alterniflora, known more commonly as oyster grass or smooth
Wetlands have come under natural and human threats (from subsiding or sinking land to draining or filling for new development). Scientists estimate that the lower 48 United States have lost more than half of their wetlands since colonial times.
Wetlands offer many significant benefits for fish and wildlife as well as society. They provide habitat for thousands of species of aquatic and terrestrial plants and animals.
A drought is a period of drier-than-normal conditions that results in water-related problems. Precipitation (either rain or snow) falls in uneven patterns across the country.