Day Two
Rock 1
Rock 2
Rock 3
Rock 4
Rock 5
Table 3.1 Comparison of the amount of Batillaria Minima
on the five rocks. Percent cover of the rock above and under were
estimated. Measurements taken include concentration around the rock and
area of the rock. By multiplying the respective percent cover by the
area of each rock, I calculated the approximate area of snails above
and under each rock.
| Day 2 |
|
|
|
|
|
|
| |
concentration around
cm |
cover under |
cover above |
area of rock cm^2 |
area of snails under rock cm^2 |
area of snails above rock |
| Rock 1 |
1 |
95% |
5% |
56 |
53.2 |
2.8 |
| Rock 2 |
<1 |
95% |
20% |
92 |
87.4 |
18.4 |
| Rock 3 |
1.5 |
95% |
10% |
84 |
79.8 |
8.4 |
| Rock 4 |
<1 |
75% |
1% |
220 |
165 |
2.2 |
| Rock 5 |
2 |
95% |
0 |
55 |
52.25 |
0 |
Figure 3.1 shows the
difference between the percent cover above and under the rocks. The
means of each value are plotted with bars denoting the variance in each
sample.
Table 3.2
| Group |
|
|
| Above Rock
Area |
|
|
| Under Rock
Area |
|
|
Table 3.3. A single factor ANOVA was performed to determine if the percent cover
above the rock differed significantly from the percent cover under the
rock. Asterisks (*) mark differences that are significant (p < .05).
| Anova: Single
Factor |
|
|
|
|
|
|
|
|
|
|
|
|
|
| SUMMARY |
|
|
|
|
|
|
| Groups |
Count |
Sum |
Average |
Variance |
|
|
| area of snails under rock cm^2 |
5 |
437.65 |
87.53 |
2121.1495 |
|
|
| area of snails on top of rock |
5 |
31.8 |
6.36 |
54.888 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ANOVA |
|
|
|
|
|
|
| Source of Variation |
SS |
df |
MS |
F |
P-value |
F crit |
| Between Groups |
16471.42225 |
1 |
16471.4223 |
15.1384 |
0.00460353 |
5.317655 |
| Within Groups |
8704.15 |
8 |
1088.01875 |
|
|
|
|
|
|
|
|
|
|
| Total |
25175.57225 |
9 |
|
|
|
|
DAY 3