Number ^age 



16 Year-to-year variations in peak live biomass of Spartina alterni flora 



at a single site in the Barataria basin 49 



17 Spartina alterni flora root alcohol dehydrogenase (ADH) activity, 

 adenosine triphosphate (ATP) and ethanol concentrations, and soil Eh 



in a Louisiana sal t marsh 52 



18 Percentage of marsh community ;netabolism by Spartina alterniflora 54 



19 Submerged aquatic plant species composition of ponds and lakes by 



marsh zone along the Louisiana coast 55 



20 Range and mean loss rates (mg/g/day) of litter from different marsh 



plant species (summarized from Appendix 2) 59 



21 Monthly occurrence and abundance of the fish species collected in 



smal 1 sal t marsh ponds 62 



22 Wildlife species richness (number of species) in the chenier plain 



marshes 64 



23 Muskrat house-building activity in 10-ha brackish and salt marsh areas 



in Barataria basin 66 



24 Density of waterfowl (number/100 ha) by marsh zone in the Barataria 



basin in 1980-81 68 



25 Density of ponds and lakes of various size classes in marsh zones 



along the Louisiana coast, August, 1968 69 



26 The percent of the area of ponds and lakes covered with submerged 

 vegetation in August, 1968 by size and marsh zone 70 



27 Density of wading birds and pelicans (number/100 ha) by marsh zone, 



in the Barataria basin, 1980-81 70 



28 Birds of the Mississippi Deltaic Plain on the Audubon Society "Blue 



List," indicating that their populations are declining 71 



29 Estimates of different components of the carbon budget of a 



Mississippi deltaic salt marsh community 73 



30 Influence of Spartina alterniflora plants on recovery of ^^N-ammonium 



added over 18 weeks to soil cores 76 



31 The estimated economic value of harvests from the Barataria basin, 

 Louisiana 85 



32 Estimates of the economic value of Louisiana's coastal wetlands 

 comparing willingness-to-pay approaches with energy analysis 



approaches 89 



33 Major wetland issues and human impacts in Mississippi delta wetlands .... 89 



34 Impacts of canals in Louisiana coastal marshes leading to habitat 

 loss, and mechanisms and management practices to minimize these 



impacts 90 



xiii 



