The ecology of delta marshes The ecology of delta marshes of coastal Louisiana : a community profile ecologyofdeltama00goss Year: 1984 . , fT^no,,:,... I PONTCHARTRAINj h^, \ lA ^4; '-^ j^RR^BO^Nrft^^.J S G(/tF OF MEXICO Figure 5. Map of the Mississippi River Deltaic Plain showing the hydrologic units, al. 1983). These data and maps are from a recent Fish and Wildlife Service study of the Mississippi Delta Plain Region (Wicker 1980; Wicker et al. 1980a, 1980b). The drainage basins are interdistributary basins formed by shifts in the major distributary of the river. Thus they forni a time se
The ecology of delta marshes The ecology of delta marshes of coastal Louisiana : a community profile ecologyofdeltama00goss Year: 1984 . , fT^no,,:,... I PONTCHARTRAINj h^, \ lA ^4; '-^ j^RR^BO^Nrft^^.J S G(/tF OF MEXICO Figure 5. Map of the Mississippi River Deltaic Plain showing the hydrologic units, al. 1983). These data and maps are from a recent Fish and Wildlife Service study of the Mississippi Delta Plain Region (Wicker 1980; Wicker et al. 1980a, 1980b). The drainage basins are interdistributary basins formed by shifts in the major distributary of the river. Thus they forni a time series of delta lobes of different ages and allow one to see in space the time sequence of the development and decay of the marshes of a delta lobe. The active Mississipoi River delta, the Balize Delta, is next youngest. It receives two-thirds of the flow of the Mississippi River, but it is debouching into deep water at the edge of the continental shelf. Most of this basin is fresh also, but there has been marine invasion of abandoned around the edges distributaries, and the brackish. subdelta lobes of the main marshes here are The youngest basin is the Atchafalaya, which is actively prograding out through the shallow Atchafalaya Bay. It receives one-third of the flow of the combined Mississippi and Red river systems, whose freshwater flows into the shallow bay keep the whole basin fresh or nearly fresh all year. All the marshes in this basin are fresh. In succession Barataria, Terrebonne, Vermilion-Cote Blanche, and the Pontchartrain-Lake Borgne basins are of increasing age. They all have extensive marshes with well-developed salt and brackish zones. These six basins together form the Mississippi Delta Plain Region, one of the best-developed deltas in the world. The Mississippi Delta Plain Region is also the largest continuous
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