Louisiana vegetation

Site Selection. Work by Kosters (18) and Kosters et al. (19) served as a guide for selection of 3 sites used in the study. These sites have different estimated salinities as indicated by vegetation and proximity to the present coast, and they contain sediments with a range of organic content, from peat to clay, as indicated by examination of available cross sections. The sites are located near Avery Island, in the Barataria Basin, and near Gueydan, Louisiana (Figure 2). 

Field and laboratory studies were conducted to determine the levels of Cd, Pb, and HCBD in various samples collected from a swamp environment in Louisiana and to assess the toxicities of As, Cd, and Hg to two species of aquatic organisms (bluegills and crawfish) indigenous to this swamp [18]. Cadmium and Pb were present in almost all collected samples. Their concentrations in fish were below the action levels set by EPA for the protection of human health. However, hazardous levels of these two elements were found in samples of crawfish, vegetation, soil, sediment, and water to some extent. Low levels of HCBD were recorded in water and sediment samples. In bioassay studies, Hg was found to be the most toxic metal, while As was the least toxic. Between the two test organisms, blue-gills appeared to be more sensitive than crawfish. Mixtures of Cd with As or Hg resulted in a combined toxic effect which was simply additive. However, a synergistic effect was recorded with the mixtures of As and Hg. 

IMPACT OF FLOODING AND SALTWATER INTRUSION ON LOUISIANA COASTAL VEGETATION... 

Sasser, C. E. and J. G. Gosselink. 1984. Vegetation and primary production in a floating freshwater marsh in Louisiana. Aquat. Bot. 20 245-255. 

Chabreck R. H. and Linscombe G. (1978) Vegetative Type Map of the Louisiana Coastal Marshes 1978. Louisiana Department of Wildlife and Fisheries, New Orleans. 

O Neil T. (1949) The muskrat in the coastal Louisiana marshes (and everything else you wanted to know about the marshes). Louisiana Wildlife and Fisheries Commission, New Orleans, 134 p -F vegetation map (color). 

On the other hand, in eastern Alabama (AS 9-26-3790) (see Plate B, opposite page 61), the conclusions are exactly the reverse here infrared emulsions, especially color, are superior to the black-and-white films. In eastern Alabama, the area is densely wooded and under intense cultivation. Vegetation shows up sharply on the infrared plates, as do hydrographic features. The same conclusions apply to the Mississippi Basin near Monroe, Louisiana, AS 9-26-3740, 3741, 3742, etc. 

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