Appendix H (Table H1). Orthogonal contrasts for response variables showing significant overall grass-shrimp effects within the split-plot ANOVA.
Experiment |
Response |
Contrast |
Contrast t value |
df |
P |
One |
Ruppia Biomass |
Encl |
-0.168 |
44 |
0.868 |
(equal variance) |
Addn |
-3.163 |
44 |
0.003 |
|
Dens |
-0.372 |
44 |
0.711 |
||
Shoot Number |
Encl |
-0.197 |
44 |
0.844 |
|
(equal variance) |
Addn |
-3.033 |
44 |
0.004 |
|
Dens |
-0.099 |
44 |
0.921 |
||
Epiphyte chl [a] |
Encl |
1.269 |
43 |
0.069 |
|
(equal variance) |
Addn |
3.530 |
43 |
0.001 |
|
Dens |
2.148 |
14.212 |
0.037 |
||
Two |
Ruppia Biomass |
Encl |
1.412 |
21.230 |
0.172 |
(unequal variance) |
Addn |
-5.041 |
19.060 |
<0.001 |
|
Dens |
-3.248 |
13.338 |
0.006 |
||
Shoot Number |
Encl |
1.353 |
20.802 |
0.191 |
|
(unequal variance) |
Addn |
-5.743 |
20.113 |
<0.001 |
|
Dens |
-3.331 |
12.216 |
0.006 |
||
Three |
Ruppia Biomass |
Encl |
-0.395 |
43 |
0.694 |
(equal variance) |
Addn |
-2.186 |
43 |
0.034 |
|
Dens |
-0.415 |
43 |
0.680 |
Note: Contrast Effects: Encl = Enclosure; Addn = Shimp Addition; Dens = Shrimp Density. Equal variance = equal variance assumed; unequal variance = unequal variance assumed.