of new stands and also to the development and production of mature 

 stands of wigeongrass. Correlations were found between water depth, 

 turbidity, and vegetative production. The greatest production was 

 obtained at the 24-inch water level. A generalized range of turbidity 

 which will allow wigeongrass growth in ponds with water depths less 

 than 24 inches, as found in this study, is from 25 ppm to 54 ppm. 



Wigeongrass was observed growing in a wide range of salinities from 

 2,075 ppm to 18,500 ppm in the study ponds and 1,160 ppm to 19,000 ppm 

 in the experimental tanks. There was no correlation between chlorides 

 and growth of wigeongrass. Wigeongrass was found to have two growing 

 seasons that are controlled by a temperature range of 18.5°C to 30°C. 

 When the temperature was above or below these figures, growth apparently 

 ceased. 



Water quality and soil chemistry, other than the factors mentioned 

 above, proved to be of little significance in influencing the growth 

 of wigeongrass. (G.S.) 



Keywords: wigeongrass, primary production, Louisiana 



II-E-2 



Steward, K.K., and W.H. Ornes. 1973. The autecology of sawgrass 

 ( Mariscus jamaicensis ) in the Florida Everglades. National Park 

 Service, Atlanta, Georgia, Ecological Report No. DI-SFEP-74-04. 10 pp. 



Estimates were obtained for the standing crop, plant density, stem 

 length, leaf numbers, growth rate, and nutrient relationships in tissue, 

 soil, and water for typical stands of sawgrass in the Florida Everglades. 

 The nutrient requirements were determined to be low in comparison to 

 other species of Everglades macrophytes. The apparent low nutrient 

 requirements of sawgrass may partially explain its dominance in the 

 marsh community. (J.B.) 



Keywords: primary productivity, sawgrass, Florida (Everglades) 



II-E-3 



Steward, K.K., and W.H. Ornes. 1973. Investigations into the mineral 



nutrition of sawgrass using experimental cultural techniques. National 



Park Service, Atlanta, Georgia, Ecological Report No. DI-SFEP-74-05. 11 pp 



The nutrient levels of sawgrass plants ( Cladium jamaicense ) were 

 determined for an area in the Florida Everglades, and experimental 

 culture techniques were used to determine the response of sawgrass 

 to nutrient enrichment. There appeared to be an optimum phosphorus 



81 



