Table 25. Mean percent survival of each species by zone in Block V. 
Species are arranged in descending order of survival. 
“Upper zone Middie Zone Lower Zone 
Earl 
Gulf cordgrass TAGS) No Black mangrove Sod 
Giant reed 50.0 b Survival Smooth cordgrass 1.3d 
Black mangrove 35.7 ab 
Saltgrass 34.5 ab 
Smooth cordgrass 31.0 ab 
Common reed 24.0 ab 
Olney bulrush 23.1 ab 
Big cordgrass 14.3 a 
Saltmarsh bulrush 12.0 a 
Saltcedar Sia! 
American bulrush 0.0 a 
Needlegrass 0.0 a 
Seeds 
(Smooth cordgrass) 0.0 a 
*Means followed by the same letter within zones are not signifi- 
cantly different at the 95 percent level. 
c. Wave-stilling device. Indications were that wave action com- 
bined with the structurally unstable soil was responsible for most of 
the low survival rates measured for the five planting dates. In 
November 1974, a wave-stilling device was installed. To date it has 
been effective in eliminating losses of transplants due to washout. 
5. Germination. 
Approximately 24 percent of the seed collected in November and 
December 1974 contained caryopsis. Smooth cordgrass seeds, in glumes, 
germinated under laboratory conditions (Table 26). Seeds with glumes 
removed had the lowest germination percentage. Mechanical damage or 
excessive drying with glume removal may cause the lower germination 
percentage. Germination of seeds stored under dry and cold conditions 
was slower than for seed stored wet and cold. However, total germina- 
60 
