Data
Figure 1: This shows the overall densities of L. obtusata vs. L. littorea. The figure shows more
L. littorea found at lower elevations, and L. obtusata found at higher elevations.
|
Source |
Nparm |
DF |
Sum of Squares |
F Ratio |
Prob > F |
|
|
Elevation |
1 |
1 |
1607.2349 |
4.4385 |
0.0433 |
|
|
Day |
1 |
1 |
625.9274 |
1.7286 |
0.1982 |
|
|
Species |
1 |
1 |
1024 |
2.8279 |
0.1027 |
|
|
Species*Elevation |
1 |
1 |
3535.1262 |
9.7626 |
0.0038 |
|
Table 1: This shows the interaction between the different species of snails and elevation. There is a
significant p-value shown for elevation and the interaction between species and elevation.
|
Parameter Estimates |
|
|
|
|
|
|
|
|
|
|
|
|
|
Term |
|
Estimate |
Std Error |
t Ratio |
Prob>|t| |
|
Intercept |
|
1.6463321 |
0.245178 |
6.71 |
<.0001 |
|
Number |
|
-0.006098 |
0.009763 |
-0.62 |
0.5367 |
|
Species[littorea] |
0.0325214 |
0.194842 |
0.17 |
0.8685 |
|
|
(Number-17.8889)*Species[littorea] |
-0.022609 |
0.009763 |
-2.32 |
0.0271 |
|
Table 2: The results show a significant interaction between the number of snails at each
elevation and the snail species
|
Source |
Nparm |
DF |
Sum of Squares |
F Ratio |
Prob > F |
|
Number |
1 |
1 |
0.4950948 |
0.3901 |
0.5367 |
|
Species |
1 |
1 |
0.035356 |
0.0279 |
0.8685 |
|
Number*Species |
1 |
1 |
6.8065223 |
5.3634 |
0.0271 |
Table 3: Same table as above, but also includes the sum of squares and the F-Ratio.
Figure 2: Regression between the number of L. obtusata and the number of L. littorea
|
ANOVA |
|
|
|
|
|
|
|
df |
SS |
MS |
F |
Significance F |
|
Regression |
1 |
14.36492887 |
14.36492887 |
3.288327 |
0.088575 |
|
Residual |
16 |
69.8953872 |
4.3684617 |
|
|
|
Total |
17 |
84.26031607 |
|
|
|
Table 4: This table shows the significance of the regression found in Figure 2. It is not statiscially
significant
Figure 3: Graphical representation difference between the least square means of
the color morphs of L. obtusata. There is no significance between the different
color morphs.