TABLE III. Mean amounts of vegetation per quadrat inside and 
outside nutria exclosure 1 near Cheniere~au-Tigre 
Weight in eromel! 
Inside 
Outside 
No. of stems, all speciese/ 
Inside 
Outside 
No. of 
Plots 
20 
20 
39 
No. of culms, Olney's three»squares/ 
Inside 
Outside 
No. of culms, big sugupeoas! 
Inside 
Outside 

14 
20 
6 
14 
1953 
134.6 
90.6 
81.4 
66.3 
47 
4.€ 
10.2 
1-9 
1954 1955 1956 
9362 10569 159.9 
85.9 112.7 112.2 
88.5 94.3 88.4 
87.5 114.6 121.6 
368 1.0 1.3 
0.5 O.1 0.2 
6.3 9.7 520 
45 2.6 1.0 
1/ Difference between means for location: prob. 0.02; 
for years: prob. 0.01 
2/ Differences among means for years: prob. 0.01 
3/ Differences between means for locations and years: prob. 0.01 
36 
