A Saltmeadow cordgrass - 
saltgrass type 2% level (16 samples) 
C Saltmeadow cordgrass - Olney's 
three-square type 5% level (13 samples) 
Big cordgrass as a dominant decreased in coverage and density 
each year, except for a small increase from 1955 to 1956 on the 
reed-big cordgrass type of Transect C. Evidence indicates in this 
exception that the increase was due more to the reed than to the 
big cordgrass component of the vegetation. The probabilities of 
these changes being chance occurrences are as follows: 
A North stand of 
big cordgrass 1954-55 41% level ( 6 samples) 
A south stand of 
big cordgrass 1954-55 1% level (30 samples) 
1955-56 &% level (30 samples) 
C Big cordgrass-reed 
type 1954-55 14% level (11 samples) 
1955-56 31% level (11 samples) 
increases in coverage of subordinate big cordgrass did occur from 
1955 to 1956 as scattered culms. Big cordgrass stands on Tran- 
sect B, the north stand of Transect A, and a colony near Transect C 
were almost completely eradicated during the period of study. 
Reed decreased in density and coverage from 1954 to 1955 and 
increased by 1956, reaching its 1954 coverage but not its 1954 
density. The probabilities of these changes being chance occurrences 
are 0.06 and 0.21 respectively. 
le 
