II-E-10 



Turner, R.E., and J.G. Gosselink. 1975. A note on standing crops of 



Spartina alterni flora in Texas and Florida. University of Texas 



Contributions in Marine Science 19:113-118. 



A late summer (August 19-24) survey of eight Spartina alterniflora 

 marshes in Texas and Florida was conducted in 1974. The authors 

 found that the live biomass is equivalent to or slightly greater 

 than that found on the north Atlantic coast, but the dead biomass is 

 considerably greater. The relationships of grass height to biomass 

 that were described for North Carolina (Williams and Murdoch, 1969) 

 and Rhode Island (Nixon and Oviatt, 1973) were also valid for the 

 Gulf marshes. The slope of the regression equations appears to increase 

 with decreasing latitude and reflects changes in stem density and 

 weight. (A. A. , modified) 



Keywords: Spartina alterniflora , biomass, Texas, Florida 



II-E-11 



Turner, R.E. 1976. Geographic variations in salt marsh macrophyte pro- 

 duction: a review. University of Texas Contributions in Marine Science 

 20:47-68. 



A review of salt marsh macrophyte production measurements supports 

 the conclusion of a north-south gradient which parallels solar energy 

 inputs at a 0.20-0,35% net conversion efficiency. There is considerable 

 variation within and among marshes. Methods previously employed to 

 measure salt marsh macrophyte production have generally underestimated 

 the actual net above-ground production because of an inability to account 

 for the turnover of live material between sampling periods. Turnover 

 apparently increases with decreasing latitude and may be equal to annual 

 changes in standing live biomass. The effect of other factors influenc- 

 ing production are discussed and a detailed data review presented. (A. A.) 



Keywords: Spartina alterniflora , salt marsh, geographic variation, 

 biomass 



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